Science.gov

Sample records for gulf of mexico region

  1. MEASURED AND PREFORMED PHOSPHATE IN THE GULF OF MEXICO REGION.

    DTIC Science & Technology

    Measured and preformed phosphate-phosphorous versus depth are presented for three recent cruises to the Gulf of Mexico region. Phosphate...are discussed for a hypothetical idealized station in the Gulf of Mexico . (Author)

  2. Gulf of Mexico Regional Collaborative Final Report

    SciTech Connect

    Judd, Kathleen S.; Judd, Chaeli; Engel-Cox, Jill A.; Gulbransen, Thomas; Anderson, Michael G.; Woodruff, Dana L.; Thom, Ronald M.; Guzy, Michael; Hardin, Danny; Estes, Maury

    2007-12-01

    This report presents the results of the Gulf of Mexico Regional Collaborative (GoMRC), a year-long project funded by NASA. The GoMRC project was organized around end user outreach activities, a science applications team, and a team for information technology (IT) development. Key outcomes are summarized below for each of these areas. End User Outreach; Successfully engaged federal and state end users in project planning and feedback; With end user input, defined needs and system functional requirements; Conducted demonstration to End User Advisory Committee on July 9, 2007 and presented at Gulf of Mexico Alliance (GOMA) meeting of Habitat Identification committee; Conducted significant engagement of other end user groups, such as the National Estuary Programs (NEP), in the Fall of 2007; Established partnership with SERVIR and Harmful Algal Blooms Observing System (HABSOS) programs and initiated plan to extend HABs monitoring and prediction capabilities to the southern Gulf; Established a science and technology working group with Mexican institutions centered in the State of Veracruz. Key team members include the Federal Commission for the Protection Against Sanitary Risks (COFEPRIS), the Ecological Institute (INECOL) a unit of the National Council for science and technology (CONACYT), the Veracruz Aquarium (NOAA’s first international Coastal Ecology Learning Center) and the State of Veracruz. The Mexican Navy (critical to coastal studies in the Southern Gulf) and other national and regional entities have also been engaged; and Training on use of SERVIR portal planned for Fall 2007 in Veracruz, Mexico Science Applications; Worked with regional scientists to produce conceptual models of submerged aquatic vegetation (SAV) ecosystems; Built a logical framework and tool for ontological modeling of SAV and HABs; Created online guidance for SAV restoration planning; Created model runs which link potential future land use trends, runoff and SAV viability; Analyzed SAV

  3. NASA'S SERVIR Gulf of Mexico Project: The Gulf of Mexico Regional Collaborative (GoMRC)

    NASA Technical Reports Server (NTRS)

    Quattrochi, Dale A.; Irwin, Daniel; Presson, Joan; Estes, Maury; Estes, Sue; Judd, Kathleen

    2006-01-01

    The Gulf of Mexico Regional Collaborative (GoMRC) is a NASA-funded project that has as its goal to develop an integrated, working, prototype IT infrastructure for Earth science data, knowledge and models for the five Gulf U.S. states and Mexico, and to demonstrate its ability to help decision-makers better understand critical Gulf-scale issues. Within this preview, the mission of this project is to provide cross cutting solution network and rapid prototyping capability for the Gulf of Mexico region, in order to demonstrate substantial, collaborative, multi-agency research and transitional capabilities using unique NASA data sets and models to address regional problems. SERVIR Mesoamerica is seen as an excellent existing framework that can be used to integrate observational and GIs data bases, provide a sensor web interface, visualization and interactive analysis tools, archival functions, data dissemination and product generation within a Rapid Prototyping concept to assist decision-makers in better understanding Gulf-scale environmental issues.

  4. NASA'S SERVIR Gulf of Mexico Project: The Gulf of Mexico Regional Collaborative (GoMRC)

    NASA Technical Reports Server (NTRS)

    Quattrochi, Dale A.; Irwin, Daniel; Presson, Joan; Estes, Maury; Estes, Sue; Judd, Kathleen

    2006-01-01

    The Gulf of Mexico Regional Collaborative (GoMRC) is a NASA-funded project that has as its goal to develop an integrated, working, prototype IT infrastructure for Earth science data, knowledge and models for the five Gulf U.S. states and Mexico, and to demonstrate its ability to help decision-makers better understand critical Gulf-scale issues. Within this preview, the mission of this project is to provide cross cutting solution network and rapid prototyping capability for the Gulf of Mexico region, in order to demonstrate substantial, collaborative, multi-agency research and transitional capabilities using unique NASA data sets and models to address regional problems. SERVIR Mesoamerica is seen as an excellent existing framework that can be used to integrate observational and GIs data bases, provide a sensor web interface, visualization and interactive analysis tools, archival functions, data dissemination and product generation within a Rapid Prototyping concept to assist decision-makers in better understanding Gulf-scale environmental issues.

  5. Why is Coastal Community Resilience Important in the Gulf of Mexico Region?

    EPA Pesticide Factsheets

    The Gulf of Mexico Program supports the regional collaborative approach and efforts of the Coastal Community Resilience Priority Issue Team of the Gulf of Mexico Governors’ Alliance and its broad spectrum of partners and stakeholders.

  6. 76 FR 18723 - Proposed Information Collection; Comment Request; Southeast Region Gulf of Mexico Red Snapper IFQ...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-05

    ... Region Gulf of Mexico Red Snapper IFQ Program AGENCY: National Oceanic and Atmospheric Administration... Act. NMFS manages the red snapper fishery in the waters of the Gulf of Mexico under the Reef Fish FMP...

  7. 76 FR 61695 - Gulf of Mexico Regional Ecosystem Restoration Strategy (Preliminary)

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-10-05

    ... AGENCY Gulf of Mexico Regional Ecosystem Restoration Strategy (Preliminary) AGENCY: Environmental... the Gulf of Mexico Regional Ecosystem Restoration Strategy (Preliminary) for public review and.... EPA-HQ-OA-2011-0798. President Barack Obama established the Gulf Coast Ecosystem Restoration Task...

  8. Gulf of Mexico Initiative: NASA Capacity Building in the Gulf Region

    NASA Astrophysics Data System (ADS)

    Armstrong, D.; Graham, W. D.; Searby, N. D.

    2012-12-01

    In the wake of hurricanes Katrina and Rita, NASA created the Gulf of Mexico Initiative (GOMI) to help the region recover and to build the capacity of local and regional organizations to utilize NASA Earth science assets to establish effective policies, encourage sustainable natural resource management and utilization, and to expeditiously respond to crises. GOMI worked closely with the Gulf of Mexico Alliance (GOMA), a regional collaboration of the five US Gulf states and 13 federal agencies, to select projects that addressed high priority issues of the region. Many capabilities developed by this initiative have been adopted by end-users and have been leveraged to respond to other natural and man made disasters such as the Deepwater Horizon oil spill (2010), record breaking floods along the Mississippi River (2011), unprecedented tornado supercells (2011), and extreme drought (2012). Examples of successful capacity building projects will be presented and the lessons learned from these projects will be discussed.

  9. Gulf of Mexico

    Atmospheric Science Data Center

    2014-05-15

    article title:  Continued Spread of Gulf of Mexico Oil Slick       View ... passed over the Deepwater Horizon oil slick in the Gulf of Mexico on May 8, 2010, at approximately 16:50 UTC (11:50 a.m. local time), then ...

  10. KT boundary impact glasses from the Gulf of Mexico region

    NASA Technical Reports Server (NTRS)

    Claeys, Philippe; Alvarez, Walter; Smit, Jan; Hildebrand, A. R.; Montanari, Alessandro

    1993-01-01

    Cretaceous-Tertiary boundary (KTB) tektite glasses occur at several sites around the Gulf of Mexico. Contrary to rumor among KTB workers, glass fragments have been found by several researchers in the base of the spherule bed at Arroyo el Mimbral in NE Mexico. The presence of green, red, and transparent glass fragments at Mimbral only, demonstrates that the Mimbral glass is not a laboratory contamination by Beloc glass. The chemistry and ages of the glass are consistent with an origin from the Chixculub impact crater in Yucatan. No evidence supports a volcanic origin for the KTB glasses. A discussion of tektite glass from the KT boundary is presented.

  11. KT boundary impact glasses from the Gulf of Mexico region

    NASA Technical Reports Server (NTRS)

    Claeys, Philippe; Alvarez, Walter; Smit, Jan; Hildebrand, A. R.; Montanari, Alessandro

    1993-01-01

    Cretaceous-Tertiary boundary (KTB) tektite glasses occur at several sites around the Gulf of Mexico. Contrary to rumor among KTB workers, glass fragments have been found by several researchers in the base of the spherule bed at Arroyo el Mimbral in NE Mexico. The presence of green, red, and transparent glass fragments at Mimbral only, demonstrates that the Mimbral glass is not a laboratory contamination by Beloc glass. The chemistry and ages of the glass are consistent with an origin from the Chixculub impact crater in Yucatan. No evidence supports a volcanic origin for the KTB glasses. A discussion of tektite glass from the KT boundary is presented.

  12. Multibeam mapping of the Pinnacles region, Gulf of Mexico

    USGS Publications Warehouse

    Gardner, James V.; Dartnell, Peter; Sulak, Kenneth J.

    2002-01-01

    Recent USGS mapping shows an extensive deep (~100 m) reef tract occurs on the Mississippi-Alabama outer continental shelf (Figure 1). The tract, known as "The Pinnacles", is apparently part of a sequence of drowned reef complexes along the "40-fathom" shelf edge of the northern Gulf of Mexico (Ludwick and Walton, 1957). It is critical to determine the accurate geomorphology of these deep-reefs because of their importance as benthic habitats for fisheries. The Pinnacles have previously been mapped using a single-beam echo sounder (Ludwick and Walton,1957), sidescan sonar (Laswell et al., 1990), and the TAMU2 towed single-beam sidescan-sonar system (Anonymous, 1999). These existing studies do not provide the quality of geomorphic data necessary for reasonable habitat studies.

  13. Venezuelan Equine Encephalitis Virus Activity in the Gulf Coast Region of Mexico, 2003–2010

    PubMed Central

    Adams, A. Paige; Navarro-Lopez, Roberto; Ramirez-Aguilar, Francisco J.; Lopez-Gonzalez, Irene; Leal, Grace; Flores-Mayorga, Jose M.; Travassos da Rosa, Amelia P. A.; Saxton-Shaw, Kali D.; Singh, Amber J.; Borland, Erin M.; Powers, Ann M.; Tesh, Robert B.; Weaver, Scott C.; Estrada-Franco, Jose G.

    2012-01-01

    Venezuelan equine encephalitis virus (VEEV) has been the causative agent for sporadic epidemics and equine epizootics throughout the Americas since the 1930s. In 1969, an outbreak of Venezuelan equine encephalitis (VEE) spread rapidly from Guatemala and through the Gulf Coast region of Mexico, reaching Texas in 1971. Since this outbreak, there have been very few studies to determine the northward extent of endemic VEEV in this region. This study reports the findings of serologic surveillance in the Gulf Coast region of Mexico from 2003–2010. Phylogenetic analysis was also performed on viral isolates from this region to determine whether there have been substantial genetic changes in VEEV since the 1960s. Based on the findings of this study, the Gulf Coast lineage of subtype IE VEEV continues to actively circulate in this region of Mexico and appears to be responsible for infection of humans and animals throughout this region, including the northern State of Tamaulipas, which borders Texas. PMID:23133685

  14. Venezuelan equine encephalitis virus activity in the Gulf Coast region of Mexico, 2003-2010.

    PubMed

    Adams, A Paige; Navarro-Lopez, Roberto; Ramirez-Aguilar, Francisco J; Lopez-Gonzalez, Irene; Leal, Grace; Flores-Mayorga, Jose M; Travassos da Rosa, Amelia P A; Saxton-Shaw, Kali D; Singh, Amber J; Borland, Erin M; Powers, Ann M; Tesh, Robert B; Weaver, Scott C; Estrada-Franco, Jose G

    2012-01-01

    Venezuelan equine encephalitis virus (VEEV) has been the causative agent for sporadic epidemics and equine epizootics throughout the Americas since the 1930s. In 1969, an outbreak of Venezuelan equine encephalitis (VEE) spread rapidly from Guatemala and through the Gulf Coast region of Mexico, reaching Texas in 1971. Since this outbreak, there have been very few studies to determine the northward extent of endemic VEEV in this region. This study reports the findings of serologic surveillance in the Gulf Coast region of Mexico from 2003-2010. Phylogenetic analysis was also performed on viral isolates from this region to determine whether there have been substantial genetic changes in VEEV since the 1960s. Based on the findings of this study, the Gulf Coast lineage of subtype IE VEEV continues to actively circulate in this region of Mexico and appears to be responsible for infection of humans and animals throughout this region, including the northern State of Tamaulipas, which borders Texas.

  15. Seasonal Sea Level Cycle Change: Understanding the Possible Climate Feedbacks Over the Gulf of Mexico and the Gulf Stream Region

    NASA Astrophysics Data System (ADS)

    Ricko, M.; Ray, R. D.; Beckley, B. D.

    2016-12-01

    Recent change in the seasonal sea level cycle has been observed in satellite radar altimetry record, especially over regions such as the Gulf of Mexico and the Gulf Stream region. Gridded satellite data is in a good agreement with ground tide gauge data that also confirm increased annual amplitude of sea level during most recent years. Data analysis is based on a set of tide gauges, satellite measurements and models. A consistent positive trend in the seasonal sea level cycle during recent years over different regions has been well confirmed (e.g., Wahl et al. 2014, Etcheverry et al. 2015). Over a longer timescale, historical tide gauge data give a neutral or slightly positive trend in the seasonal cycle of sea level along the coast of the Gulf of Mexico. This observed signal of increased seasonal sea level cycle in tide gauges over the coastal areas is extended with satellite observations to open ocean regions. It is most evident during last several years (2007-2015) over most of the Gulf of Mexico, especially over north-eastern and central parts of the Gulf of Mexico, and over the Gulf Stream region, showing mean annual amplitude larger than 15 cm. One part of this increase appears to be due to change in mean sea level pressure. However, main causes of seasonal sea level cycle change on interannual to climate scale have not yet been understood. To determine possible climate feedbacks responsible for observed change in the seasonal sea level cycle, its relationship with parameters such as sea surface temperature, wind curl, circulation, mesoscale eddies, etc., is investigated. Model-based results (e.g., NASA's GMAO model) give similar trend and feedbacks, but with a consistent bias and underestimation of annual amplitude increase. Understanding climate mechanisms responsible for observed seasonal sea level cycle change would offer better prediction of sea level variability on interannual to interdecadal time scales.

  16. 30 CFR 250.150 - How do I name facilities and wells in the Gulf of Mexico Region?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 30 Mineral Resources 2 2012-07-01 2012-07-01 false How do I name facilities and wells in the Gulf of Mexico Region? 250.150 Section 250.150 Mineral Resources BUREAU OF SAFETY AND ENVIRONMENTAL... name facilities and wells in the Gulf of Mexico Region? (a) Assign each facility a letter designation...

  17. 30 CFR 250.150 - How do I name facilities and wells in the Gulf of Mexico Region?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 30 Mineral Resources 2 2013-07-01 2013-07-01 false How do I name facilities and wells in the Gulf of Mexico Region? 250.150 Section 250.150 Mineral Resources BUREAU OF SAFETY AND ENVIRONMENTAL... name facilities and wells in the Gulf of Mexico Region? (a) Assign each facility a letter designation...

  18. 30 CFR 250.150 - How do I name facilities and wells in the Gulf of Mexico Region?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 30 Mineral Resources 2 2014-07-01 2014-07-01 false How do I name facilities and wells in the Gulf of Mexico Region? 250.150 Section 250.150 Mineral Resources BUREAU OF SAFETY AND ENVIRONMENTAL... name facilities and wells in the Gulf of Mexico Region? (a) Assign each facility a letter designation...

  19. 30 CFR 250.150 - How do I name facilities and wells in the Gulf of Mexico Region?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 30 Mineral Resources 2 2010-07-01 2010-07-01 false How do I name facilities and wells in the Gulf of Mexico Region? 250.150 Section 250.150 Mineral Resources MINERALS MANAGEMENT SERVICE, DEPARTMENT... and wells in the Gulf of Mexico Region? (a) Assign each facility a letter designation except for those...

  20. Northern Gulf of Mexico (NGOM) Regional Sediment Management Demonstration Program Initiatives

    DTIC Science & Technology

    2005-09-01

    Gulf of Mexico (NGOM) Regional Sediment Management (RSM) Demonstration Program (DP), which was led by the US Army Corps of Engineers Mobile District. Mobile s demonstration identified and prioritized projects and associated issues that could quickly realize the benefits resulting from a regional management approach. The experience gained from these initiatives has been extended and applied to other Mobile District projects throughout the

  1. Gulf of California, Mexico

    NASA Technical Reports Server (NTRS)

    1982-01-01

    Sunglint on the water's surface reveals the complex pattern of currents in the Gulf of California in the vicinity of Tiburon and Angel de la Guarda Islands (29.0N, 113.0W). Mexico's state of Sonora and the Sonora Desert is on the mainland and the state of Baja California consists of the entire peninsula. The Pacific Ocean is under the coastal cloud cover on the Baja peninsula.

  2. Synthesis of Seafood Catch, Distribution, and Consumption Patterns in the Gulf of Mexico Region

    SciTech Connect

    Steimle and Associates, Inc.

    1999-08-16

    The purpose of this task was to gather and assemble information that will provide a synthesis of seafood catch, distribution and consumption patterns for the Gulf of Mexico (GOM) region. This task was part of a U.S. Department of Energy (DOE)-sponsored project entitled ''Environmental and Economic Assessment of Discharges from Gulf of Mexico Region Oil and Gas Operations.'' Personal interviews were conducted with a total of 905 recreational fishermen and 218 commercial fishermen (inclusive of shrimpers, crabbers, oystermen and finfishermen) in Louisiana and Texas using survey questionnaires developed for the study. Results of these interviews detail the species and quantities caught, location of catch, mode of fishing, distribution of catch, family consumption patterns and demographics of the fishermen.

  3. Climate Change in U.S. South Atlantic, Gulf of Mexico and Caribbean Fisheries Regions

    NASA Astrophysics Data System (ADS)

    Roffer, M. A.; Hernandez, D. L.; Lamkin, J. T.; Pugliese, R.; Reichert, M.; Hall, C.

    2016-02-01

    A review of the recent evidence that climate change is affecting marine ecosystems in the U.S. fishery management zones of the South Atlantic, Gulf of Mexico and Caribbean regions will be presented. This will include affects on the living marine resources (including fish, invertebrates, marine mammals and turtles), fisheries, habitat and people. Emphasis will be given on the effects that impact managed species and the likely new challenges that they present to fishery managers. The evidence is being derived from the results of the "Climate Variability and Fisheries Workshop: Setting Research Priorities for the Gulf of Mexico, South Atlantic, and Caribbean Regions," October 26-28, 2015 in St. Petersburg Beach, Florida. Commonalities and regional differences will be presented in terms of how climate variability is likely to impact distribution, catch, catchability, socioeconomics, and management.

  4. Nested Gulf of Mexico Modeling with HYCOM

    DTIC Science & Technology

    2004-10-29

    Gulf of Mexico Modeling with HYCOM Patrick J. Hogan1 Alan J. Wallcraft1 Ole Martin Smedstad2 1Naval Research Laboratory Stennis Space Center...2004 4. TITLE AND SUBTITLE Nested Gulf of Mexico Modeling with HYCOM 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S...Running Nested Gulf of Mexico • 1/12° Assimilative Nested Gulf of Mexico 1/25° Free-Running Nested Gulf of Mexico

  5. Environmental and economic assessment of discharges from Gulf of Mexico Region Oil and Gas Operations

    SciTech Connect

    Gettleson, D.A.

    1997-11-24

    Task 3 (Environmental Field Sampling and Analysis of NORM, Heavy Metals, and Organics) and 4 (Monitoring of the Recovery of Impacted Wetland and Open Bay Produced Water Discharge Sites in Coastal Louisiana and Texas) activities involved continued data analysis and report writing. Task 5 (Assessment of Economic Impacts of Offshore and Coastal Discharge Requirements on Present and Future Operations in the Gulf of Mexico Region) was issued as a final report during the previous reporting period. Task 6 (Synthesis of Gulf of Mexico Seafood Consumption and Use Patterns) activities included the preparation of the final report. There were no Task 7 (Technology Transfer Plan) activities to report. Task 8 (Project Management and Deliverables) activities involved the submission of the necessary reports and routine management.

  6. Regional Geophysical Surveys and Crustal Structure of the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Rodríguez-Chavez, F.; Fucugauchi, J. U.

    2007-05-01

    Results of processing and modeling of anomaly data from regional geophysical surveys in the southern sector of the Gulf of Mexico are presented. The Gulf of Mexico has been intensively studied for several years, mainly because of the economic potential of the oil and gas resources. The basin may have formed by sea-floor spreading, rifting and lateral translation/rotation of continental slivers ssociated with major break-up and drifting apart of North and South America continental plates in the mid Mesozoic. Major structural features and crustal structure, including the continent-ocean transition and Gulf coastal passive margin are relatively poorly understood. Aerogeophysical gravity and magnetic surveys have been conducted and data are processed and modeled to investigate on the Gulf crustal structure. Spectral statistical estimates of regional basement depths derived from aeromagnetics give mean depths of 8000 m. Estimates derived from gravity anomalies are in the order of 10000 m. Depths derived from 2D and 3D seismic reflection surveys conducted for oil exploration purposes in selected areas indicate average depths to basement from 6000 m to values grater than those derived from potential field data.

  7. Precipitation Distributions Associated with Cyclones Originating Over the Gulf of Mexico and Surrounding Coastal Regions

    DTIC Science & Technology

    1988-01-01

    Gulf of Mexico to the Ohio Valley were found to extend across the Appalachians to the Atlantic coast, best explained by Miller’s (1946) Type B cyclones and found to have occurred in 5 of the 12 cyclones following this inland track. Precipitation patterns for storms tracking along the Gulf coast across the Florida panhandle to the Atlantic coast suggest that the Atlantic Ocean joins the Gulf of Mexico as a second moisture source. The central Gulf coast area tended to receive the brunt of the precipitation from these lows.

  8. GPS derived ground motions (2005-2014) within the Gulf of Mexico region referred to a stable Gulf of Mexico reference frame

    NASA Astrophysics Data System (ADS)

    Yu, J.; Wang, G.

    2015-11-01

    This study investigates current ground motions derived from the GPS geodesy infrastructure in the Gulf of Mexico region. The positions and velocity vectors of 161 continuous GPS (CGPS) stations are presented with respect to a newly established local reference frame, the Stable Gulf of Mexico Reference Frame (SGOMRF). Thirteen long-term (> 5 years) CGPS are used to realize the local reference frame. The root-mean-square (RMS) of the velocities of the 13 SGOMRF reference stations achieves 0.2 mm yr-1 in the horizontal and 0.3 mm yr-1 in the vertical directions. GPS observations presented in this study indicate significant land subsidence in the coastal area of southeastern Louisiana, the greater Houston metropolitan area, and two cities in Mexico (Aguascalientes and Mexico City). The most rapid subsidence is recorded at the Mexico City International airport, which is up to 26.6 cm yr-1 (2008-2014). Significant spatial variation of subsidence rates is observed in both Mexico City and the Houston area. The overall subsidence rate in the Houston area is decreasing. GPS observations in southeastern Louisiana indicate minor (4.0-6.0 mm yr-1) but consistent subsidence over time and space. This poses a potential threat to the safety of costal infrastructure in the long-term.

  9. GPS-derived ground deformation (2005-2014) within the Gulf of Mexico region referred to a stable Gulf of Mexico reference frame

    NASA Astrophysics Data System (ADS)

    Yu, Jiangbo; Wang, Guoquan

    2016-07-01

    This study investigates current ground deformation derived from the GPS geodesy infrastructure in the Gulf of Mexico region. The positions and velocity vectors of 161 continuous GPS (CGPS) stations are presented with respect to a newly established local reference frame, the Stable Gulf of Mexico Reference Frame (SGOMRF). Thirteen long-term (> 5 years) CGPS are used to realize the local reference frame. The root mean square (RMS) of the velocities of the 13 SGOMRF reference stations achieves 0.2 mm yr-1 in the horizontal and 0.3 mm yr-1 in the vertical directions. GPS observations presented in this study indicate significant land subsidence in the coastal area of southeastern Louisiana, the greater Houston metropolitan area, and two cities in Mexico (Aguascalientes and Mexico City). The most rapid subsidence is recorded at the Mexico City International airport, which is up to 26.6 cm yr-1 (2008-2014). Significant spatial variation of subsidence rates is observed in both Mexico City and the Houston area. The overall subsidence rate in the Houston area is decreasing. The subsidence rate in southeastern Louisiana is relatively smaller (4.0-6.0 mm yr-1) but tends to be steady over time. This poses a potential threat to the safety of coastal infrastructure in the long-term.

  10. GPS-derived ground deformation (2005-2014) within the Gulf of Mexico region referred to a stable Gulf of Mexico reference frame

    NASA Astrophysics Data System (ADS)

    Yang, L.; Yu, J.; Wang, G.

    2016-12-01

    This study investigates current ground deformation derived from the GPS geodesy infrastructure in the Gulf of Mexico region. The positions and velocity vectors of 161 continuous GPS (CGPS) stations are presented with respect to a newly established local reference frame, the Stable Gulf of Mexico Reference Frame (SGOMRF). Thirteen long-term ( > 5 years) CGPS are used to realize the local reference frame. The root mean square (RMS) of the velocities of the 13 SGOMRF reference stations achieves 0.2 mm yr -1 in the horizontal and 0.3 mm yr -1 in the vertical directions. GPS observations presented in this study indicate significant land subsidence in the coastal area of southeastern Louisiana, the greater Houston metropolitan area, and two cities in Mexico (Aguascalientes and Mexico City). The most rapid subsidence is recorded at the Mexico City International airport, which is up to 26.6 cm yr -1 (2008-2014). Significant spatial variation of subsidence rates is observed in both Mexico City and the Houston area. The overall subsidence rate in the Houston area is decreasing. The subsidence rate in southeastern Louisiana is relatively smaller (4.0-6.0 mm yr -1 ) but tends to be steady over time. This poses a potential threat to the safety of coastal infrastructure in the long-term.

  11. Potential Economic Impacts from Offshore Wind in the Gulf of Mexico Region (Fact Sheet)

    SciTech Connect

    Flores, F.; Keyser, D.; Tegen, S.

    2014-01-01

    Offshore wind is a clean, renewable source of energy and can be an economic driver in the United States. To better understand the employment opportunities and other potential regional economic impacts from offshore wind development, the U.S. Department of Energy (DOE) funded research that focuses on four regions of the country. The studies use multiple scenarios with various local job and domestic manufacturing content assumptions. Each regional study uses the new offshore wind Jobs and Economic Development Impacts (JEDI) model, developed by the National Renewable Energy Laboratory. This fact sheet summarizes the potential economic impacts for the Gulf of Mexico region.

  12. Regionalization of the Gulf of Mexico from space-time chlorophyll- a concentration variability

    NASA Astrophysics Data System (ADS)

    Salmerón-García, Olivia; Zavala-Hidalgo, Jorge; Mateos-Jasso, Adriana; Romero-Centeno, Rosario

    2011-04-01

    Regions in the Gulf of Mexico are determined based on the statistical behavior of the long-term monthly means of chlorophyll- a concentration from SeaWiFS satellite estimations. An analysis based on the four largest modes of an empirical orthogonal decomposition, which account for 84.9% of the variance, results in nine spatial patterns with different statistical behavior representing 14 connected regions. The time evolution (or principal component) of the first two modes resemble the annual cycle, but each one with a different phase; the third mode represents a semiannual period and the fourth mode shows three maxima and minima. A map of the resulting regions is obtained and the oceanographic processes taking place in each region are discussed. The largest region covers most of the deep Gulf and the continental slope. Other regions in the deep Gulf are located southeast of the Mississippi River mouth and off-shelf of southern Texas and Tabasco, all associated with seasonal offshore cross-shelf transports. The shelves are associated with specific regions, but in wide shelves the inner and outer continental platforms are separated. Among the causes that determine different regions are topographic characteristics and the seasonal variability of physical processes, mainly entrainment caused by heat and momentum fluxes, upwelling, river plumes, and cross-shelf transports associated with the convergence of the along-coast currents.

  13. Wetlands as principal zones of methylmercury production in southern Louisiana and the Gulf of Mexico region

    USGS Publications Warehouse

    Hall, B.D.; Aiken, G.R.; Krabbenhoft, D.P.; Marvin-DiPasquale, M.; Swarzenski, C.M.

    2008-01-01

    It is widely recognized that wetlands, especially those rich in organic matter and receiving appreciable atmospheric mercury (Hg) inputs, are important sites of methylmercury (MeHg) production. Extensive wetlands in the southeastern United States have many ecosystem attributes ideal for promoting high MeHg production rates; however, relatively few mercury cycling studies have been conducted in these environments. We conducted a landscape scale study examining Hg cycling in coastal Louisiana (USA) including four field trips conducted between August 2003 and May 2005. Sites were chosen to represent different ecosystem types, including: a large shallow eutrophic estuarine lake (Lake Pontchartrain), three rivers draining into the lake, a cypress-tupelo dominated freshwater swamp, and six emergent marshes ranging from a freshwater marsh dominated by Panicum hemitomon to a Spartina alterniflora dominated salt marsh close to the Gulf of Mexico. We measured MeHg and total Hg (THg) concentrations, and ancillary chemical characteristics, in whole and filtered surface water, and filtered porewater. Overall, MeHg concentrations were greatest in surface water of freshwater wetlands and lowest in the profundal (non-vegetated) regions of the lake and river mainstems. Concentrations of THg and MeHg in filtered surface water were positively correlated with the highly reactive, aromatic (hydrophobic organic acid) fraction of dissolved organic carbon (DOC). These results suggest that DOC plays an important role in promoting the mobility, transport and bioavailability of inorganic Hg in these environments. Further, elevated porewater concentrations in marine and brackish wetlands suggest coastal wetlands along the Gulf Coast are key sites for MeHg production and may be a principal source of MeHg to foodwebs in the Gulf of Mexico. Examining the relationships among MeHg, THg, and DOC across these multiple landscape types is a first step in evaluating possible links between key zones for

  14. Gulf of Mexico

    Atmospheric Science Data Center

    2014-05-15

    article title:  Unique Views of Gulf Oil Slick     View Larger Image ... where the oil appears bright. The result causes the oil spill to stand out dramatically in shades of cyan, while other features like ...

  15. INTEGRATED COASTAL MONITORING PROGRAM FOR THE GULF OF MEXICO

    EPA Science Inventory

    The Gulf of Mexico Program (GMP) Office in cooperation with Gulf State agencies, EPA Regions 4 and 6, EPA's Office of Water and Office of Research and Development (ORD), and the GMP principal partners are developing an integrated coastal monitoring program for the Gulf of Mexico....

  16. INTEGRATED COASTAL MONITORING PROGRAM FOR THE GULF OF MEXICO

    EPA Science Inventory

    The Gulf of Mexico Program (GMP) Office in cooperation with Gulf State agencies, EPA Regions 4 and 6, EPA's Office of Water and Office of Research and Development (ORD), and the GMP principal partners are developing an integrated coastal monitoring program for the Gulf of Mexico....

  17. Regional maps of subsurface geopressure gradients of the onshore and offshore Gulf of Mexico basin

    USGS Publications Warehouse

    Burke, Lauri A.; Kinney, Scott A.; Dubiel, Russell F.; Pitman, Janet K.

    2013-01-01

    The U.S. Geological Survey created a comprehensive geopressure-gradient model of the regional pressure system spanning the onshore and offshore Gulf of Mexico basin, USA. This model was used to generate ten maps that included (1) five contour maps characterizing the depth to the surface defined by the first occurrence of isopressure gradients ranging from 0.60 psi/ft to 1.00 psi/ft, in 0.10-psi/ft increments; and (2) five supporting maps illustrating the spatial density of the data used to construct the contour maps. These contour maps of isopressure-gradients at various increments enable the identification and quantification of the occurrence, magnitude, location, and depth of the subsurface pressure system, which allows for the broad characterization of regions exhibiting overpressured, underpressured, and normally pressured strata. Identification of overpressured regions is critical for exploration and evaluation of potential undiscovered hydrocarbon accumulations based on petroleum-generation pressure signatures and pressure-retention properties of reservoir seals. Characterization of normally pressured regions is essential for field development decisions such as determining the dominant production drive mechanisms, evaluating well placement and drainage patterns, and deciding on well stimulation methods such as hydraulic fracturing. Identification of underpressured regions is essential for evaluating the feasibility of geological sequestration and long-term containment of fluids such as supercritical carbon dioxide for alternative disposal methods of greenhouse gases. This study is the first, quantitative investigation of the regional pressure systems of one of the most important petroleum provinces in the United States. Although this methodology was developed for pressure studies in the Gulf of Mexico basin, it is applicable to any basin worldwide.

  18. Environmental and economic assessment of discharges from Gulf of Mexico region oil and gas operations

    SciTech Connect

    Gettleson, D.A.

    1993-04-22

    Task 3 (Environmental Field Sampling and Analysis of NORM, Heavy Metals, and Organics) activities included the continuation of the platform selection process. A revised sampling plan and a projected cost estimate were prepared for Task 3. A letter detailing the revised plan was sent to the Scientific Review Committee (SRC). Task 4 (Monitoring of the Recovery of Impacted Wetland and Open Bay Produced Water Discharge Sites in Coastal Louisiana and Texas) activities involved receiving the final approval for sampling two facilities and requesting approval for a third alternative facility. A revised Task 4 sampling plan and projected estimated costs were prepared. The sampling plan was presented to the SRC for comment. Mobilization activities for the first quarterly sampling were initiated. Task 5 (Assessment of Economic Impactsof Offshore and Coastal Discharge Requirements on Present and Future Operations in the Gulf of Mexico Region) activities included refining the model for estimating the impact of increased environmental compliance costs on remaining reserves in coastal and offshore fields. Task 6 (Synthesis of Gulf of Mexico Seafood Consumption and Use Patterns) activities involved completion and field testing of most survey forms. Retail surveys were initiated and contacts were made with the Vietnamese community. Task 7 (Technology Transfer Plan) work has included scheduling the presentation of information concerning this project at the DOE Contractor Review Meeting in July in Oklahoma. Task 8 (Project Management and Deliverables) activities have involved the submission of the necessary reports and routine management.

  19. Local and regional species diversity of benthic Isopoda (Crustacea) in the deep Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Wilson, George D. F.

    2008-12-01

    Recent studies of deep-sea faunas considered the influence of mid-domain models in the distribution of species diversity and richness with depth. In this paper, I show that separating local diversity from regional species richness in benthic isopods clarifies mid-domain effects in the distribution of isopods in the Gulf of Mexico. Deviations from the randomised implied species ranges can be informative to understanding general patterns within the Gulf of Mexico. The isopods from the GoMB study contained 135 species, with a total of 156 species including those from an earlier study. More than 60 species may be new to science. Most families of deep-sea isopods (suborder Asellota) were present, although some were extremely rare. The isopod family Desmosomatidae dominated the samples, and one species of Macrostylis (Macrostylidae) was found in many samples. Species richness for samples pooled within sites ranged from 1 to 52 species. Because species in pooled samples were highly correlated with individuals, species diversity was compared across sites using the expected species estimator ( n=15 individuals, ES 15). Six depth transects had idiosyncratic patterns of ES 15, and transects with the greatest short-range variation in topography, such as basins and canyons, had the greatest short-range disparity. Basins on the deep slope did not have a consistent influence (i.e., relatively higher or lower than surrounding areas) on the comparative species diversity. ES 15 of all transects together showed a weak mid-domain effect, peaking around 1200-1500 m, with low values at the shallowest and deepest samples (Sigsbee Abyssal Plain); no longitudinal (east-west) pattern was found. The regional species pool was analyzed by summing the implied ranges of all species. The species ranges in aggregate did not have significant patterns across longitudes, and many species had broad depth ranges, suggesting that the isopod fauna of the Gulf of Mexico is well dispersed. The summed

  20. 76 FR 23909 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Gulf of Mexico Reef Fish Fishery...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-29

    ..., Gulf of Mexico, and South Atlantic; Gulf of Mexico Reef Fish Fishery; 2011 Accountability Measures for Greater Amberjack and Closure of the 2011 Gulf of Mexico Commercial Sector for Greater Amberjack AGENCY... Reef Fish Resources of the Gulf of Mexico (FMP). The FMP was prepared by the Gulf of Mexico......

  1. Star formation in the "Gulf of Mexico"

    NASA Astrophysics Data System (ADS)

    Armond, T.; Reipurth, B.; Bally, J.; Aspin, C.

    2011-04-01

    We present an optical/infrared study of the dense molecular cloud, L935, dubbed "The Gulf of Mexico", which separates the North America and the Pelican nebulae, and we demonstrate that this area is a very active star forming region. A wide-field imaging study with interference filters has revealed 35 new Herbig-Haro objects in the Gulf of Mexico. A grism survey has identified 41 Hα emission-line stars, 30 of them new. A small cluster of partly embedded pre-main sequence stars is located around the known LkHα 185-189 group of stars, which includes the recently erupting FUor HBC 722.

  2. Vibrio gastroenteritis in the US Gulf of Mexico region: the role of raw oysters.

    PubMed

    Altekruse, S F; Bishop, R D; Baldy, L M; Thompson, S G; Wilson, S A; Ray, B J; Griffin, P M

    2000-06-01

    We examined clinical and epidemiological features of 575 laboratory-confirmed cases of vibrio gastroenteritis in Alabama, Florida, Louisiana, and Texas from 1988 to 1997 (the US Gulf of Mexico Regional Vibrio Surveillance System). Illnesses occurred year round, with peaks in spring and autumn. Illnesses lasted a median of 7 days and included fever in half of patients and bloody stools in 25% of patients with relevant information. Seventy-two percent of patients reported no underlying illnesses. In the week before onset, 236 (53%) of 445 patients for whom data were available ate raw oysters, generally at a restaurant or bar. Educational efforts should address the risk of vibrio gastroenteritis for raw oyster consumers, including healthy individuals. Further studies should examine environmental conditions affecting vibrio counts on seafood and processing technologies to enhance the safety of raw oysters.

  3. Inorganic Carbon and pH in the Gulf of Mexico: Understanding the Deepwater Horizon Region

    NASA Astrophysics Data System (ADS)

    Young, J.; Yvon-Lewis, S. A.; Bianchi, T. S.; Shields, M. R.; Du, M.

    2014-12-01

    The breakdown and respiration of oil compounds may contribute to the dissolved inorganic carbon (DIC) pool and thus ocean acidification. The Gulf of Mexico (GOM) has an abundance of natural seeps as well as numerous man-made structures that could provide a source of hydrocarbons to the water column. Samples of seawater were collected on the first GISR (Gulf Integrated Spill Research) cruise (G01) during the first week of July 2012. This cruise covered an area of ~1360 km2 roughly centered on the site of the Deepwater Horizon disaster. Alkalinity profiles for the southeastern most stations indicate lower (~100 μmol/kg) alkalinities at depth when compared to other stations sampled. This results in calculated pHs that are ~0.5 units lower at depth than they are at the other stations. Another group of stations show increased DIC concentrations on the order of 100-150 μmol/kg higher than average at depths at 800 m and 1200 m leading to calculated pHs about 0.2 to 0.4 below average for those depths in all of the stations sampled. These features may or may not be persistent in this region, and the elevated DIC concentrations may be related to organic matter (petroleum or other) oxidation. Samples were collected from this same region 2 years later (June 2014) and the persistence of these features will be discussed in the context of linkages with organic carbon respiration and low pHs.

  4. Gulf of Mexico Ocean Monitoring System

    DTIC Science & Technology

    1998-01-01

    Gulf of Mexico Ocean Monitoring System H. James Herring, Program Manager Dynalysis of Princeton 219 Wall Street, Princeton, New Jersey 08540 Phone...also with other research efforts in the Gulf of Mexico whose interests were contiguous or overlapping. We began planning the program by identifying a...oceanographic conditions in the Gulf of Mexico and make it available to interested parties in near-realtime over the Internet. The results will be a resource

  5. A comparison of HCMM surface temperatures with in situ temperature data. [Gulf of Mexico and the Nantucket Shoals Region

    NASA Technical Reports Server (NTRS)

    1982-01-01

    Algorithms were updated for a quicker analysis of computer compatible tapes in an effort to establish the absolute and relative accuracy of HCMM infrared data. Data for four case studies were identified and extracted from the tapes. These studies include three dates for the Nantucket Shoals region and one date for the Gulf of Mexico region. Upper air meteorological data, which are needed to make atmospheric correction of the HCMM data, are being reduced and prepared for calculation of the atmospheric effect.

  6. OCEANOGRAPHY IN THE GULF OF MEXICO.

    DTIC Science & Technology

    The report gives a summary of oceanographic research in the Gulf of Mexico supported by the Office of Naval Research during the period 1 May 1961...15 December 1969. This research involved theoretical studies in ocean dynamics; currents in the Gulf of Mexico , Cayman Sea, western tropical Atlantic

  7. Mesozoic to Recent, regional tectonic controls on subsidence patterns in the Gulf of Mexico basin

    NASA Astrophysics Data System (ADS)

    Almatrood, M.; Mann, P.; Bugti, M. N.

    2016-12-01

    We have produced subsidence plots for 26 deep wells into the deeper-water areas of the Gulf of Mexico (GOM) in order to identify regional tectonic controls and propose tectonic phases. Our results show three sub-regions of the GOM basin that have distinctive and correlative subsidence patterns: 1) Northern GOM from offshore Texas to central Florida (9 wells) - this area is characterized by a deeply buried, Triassic-early Jurassic rift event that is not represented by our wells that penetrate only the post-rift Cretaceous to recent passive margin phase. The sole complexity in the passive margin phase of this sub-region is the acceleration of prograding clastic margins including the Mississippi fan in Miocene time; 2) Southeastern GOM in the Straits of Florida and Cuba area (5 wells) - this area shows that the Cretaceous passive margin overlying the rift phase is abruptly drowned in late Cretaceous as this part of the passive margin of North America that is flexed and partially subducted beneath the Caribbean arc as it encroaches from the southwest to eventually collide with the North American passive margin in the Paleogene; 3) Western GOM along the length of the eastern continental margin of Mexico (12 wells) - this is the most complex of the three areas in that shares the Mesozic rifting and passive margin phase but is unique with a slightly younger collisional event and foreland basin phase associated with the Laramide orogeny in Mexico extending from the KT boundary to the Oligocene. Following this orogenic event there is a re-emergence of the passive margin phase during the Neogene along locally affected by extensional and convergent deformation associated with passive margin fold belts. In summary, the GOM basin exhibits evidence for widespread rifting and passive margin formation associated with the breakup of Pangea in Mesozoic times that was locally superimposed and deformed during the late Cretaceous-Paleogene period by: 1) Caribbean subduction and

  8. The USGS and the Gulf of Mexico

    USGS Publications Warehouse

    Dausman, Alyssa M.; Spear, Kate

    2009-01-01

    The U.S. Geological Survey (USGS) is committed to mapping, monitoring, and conducting research in the Gulf of Mexico and adjacent watersheds. Through a network of science centers in the five Gulf States and across the Nation, the USGS applies its biologic, geologic, geographic, and hydrologic expertise to provide unbiased scientific findings to decisionmakers, particularly members and supporters of the Gulf of Mexico Alliance (Gulf Alliance). The overarching goal of USGS Gulf Coast activities is to provide the scientific information, knowledge, and tools required to facilitate management decisions that promote restoration, increase coastal resilience, and mitigate risks associated with both artificial and natural hazards.

  9. Quantifying urban land cover change between 2001 and 2006 in the Gulf of Mexico region

    USGS Publications Warehouse

    Xian, George Z.; Homer, Collin; Bunde, Brett; Danielson, Patrick; Dewitz, Jon; Fry, Joyce; Pu, Ruiliang

    2012-01-01

    We estimated urbanization rates (2001–2006) in the Gulf of Mexico region using the National Land Cover Database (NLCD) 2001 and 2006 impervious surface products. An improved method was used to update the NLCD impervious surface product in 2006 and associated land cover transition between 2001 and 2006. Our estimation reveals that impervious surface increased 416 km2 with a growth rate of 5.8% between 2001 and 2006. Approximately 1110.1 km2 of non-urban lands were converted into urban land, resulting in a 3.2% increase in the region. Hay/pasture, woody wetland, and evergreen forest represented the three most common land cover classes that transitioned to urban. Among these land cover transitions, more than 50% of the urbanization occurred within 50 km of the coast. Our analysis shows that the close-to-coast land cover transition trend, especially within 10 km off the coast, potentially imposes substantial long-term impacts on regional landscape and ecological conditions.

  10. Salt tectonism in the Destin dome region, northeastern Gulf of Mexico

    SciTech Connect

    Macrae, G. )

    1991-03-01

    The continental margin of the northeastern Gulf of Mexico consists of a thick sequence of Mesozoic and Cenozoic sediments that have accumulated almost continuously since the Middle Jurassic in a relatively stable, slowly subsiding, tectonic environment. The distribution of Middle Jurassic (Callovian-age ) salt is widespread with an estimated minimum accumulation thickness of 760 m. Salt movement and associated listric normal growth faulting are the most significant tectonic elements affecting the structural development of the overlying sediments. Structural and stratigraphic relationships indicated by seismic reflection data suggest two phases of salt tectonism in the Destin dome region. The earliest record of movement of Middle Jurassic salt is in the Oxfordian-age Smackover interval sediments on the Mississippi-Alabama shelf. The development of expanded Smackover interval sedimentary sections is directly related to the regional basinward dip of the presalt surface and to the growth of salt pillows, or rollers, in response to sediment loading. Syndepositional listric normal growth faults occur on the seaward flanks of these salt structures. Growth of the Destin dome anticline on the Florida shelf reflects a significant late phase of salt movement from Late Cretaceous through early Cenozoic time. Differential sediment loading by thick salt updip onto the Florida shelf, is the interpreted mechanism for growth of the Destin dome anticline. The presalt basement surface appears to be a common detachment surface, or decollement, for salt movement.

  11. Geologic assessments and characterization of marine sand resources - Gulf of Mexico region

    USGS Publications Warehouse

    Williams, S. Jeffress; Cichon, Helena A.

    1993-01-01

    The U.S. Geological Survey conducts geologic surveys and research in marine areas of the United States and its territories and possessions. An objective in some of the investigations is locating and evaluating marine sand and gravel resources and interpretation of the origins of the sand body deposits. Results from such studies over the past 30 years show that many extremely large deposits are located close to expanding metropolitan areas, which have a need for aggregate materials for construction, and near-developed coastal areas, where beach replenishment may be used to mitigate coastal erosion. The Gulf of Mexico continental shelf from the Florida Peninsula to the Mexico border is an enormous area, but little attention has been directed on sand and gravel resources. Based on limited surveys, the total sand and gravel resources for the entire Gulf of Mexico is estimated to be 269 billion cubic meters. However, the sand tends to be fine-grained and is often mixed with mud; gravel deposits, except for shell, are mostly nonexistent.

  12. Lagrangian Predictability of High-Resolution Regional Models: The Special Case of the Gulf of Mexico

    DTIC Science & Technology

    2004-02-25

    Olson, 1994; Davis et al., 1996; Acero -Schertzer et al., 1997; Stutzer and Krauss, 1998; Garraffo et al., 2001b). The second approach is to compute the...different physical mechanisms inducing the anomalous dynamical regimes through Lq in practical ap- plications. 2.3 Irreversible-skill time The IT (τirrev... mechanism for the Gulf of Mexico circulation at the large and meso-scales. The ratios η3 and η4 fluctuate from 42% to 73% (Fig. 7c) and from 3% to 27% (Fig

  13. Deep Crustal Structure Northern Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Christeson, G. L.; Van Avendonk, H. J.; Eddy, D. R.; Norton, I. O.; Karner, G. D.; Johnson, C. A.; Kneller, E. A.; Snedden, J.

    2013-12-01

    The Gulf of Mexico is a small ocean basin between the US and Mexico that opened up soon after the breakup of Pangea. Although the area has been heavily surveyed with seismic reflection profiles, the deep structure of the region is poorly understood because of lack of penetration beneath the thick sediments and salt. We present the results of the GUMBO (GUlf of Mexico Basin Opening) project that constrains seismic velocities and thicknesses of the sediments and crust from the continental shelf to deep ocean basin in the northern Gulf of Mexico. Data were acquired in 2010 along four profiles 300-500 km in length, using the industry vessel R/V Iron Cat and ocean bottom seismometers at 10-12 km spacing. Plate tectonic models for the Gulf of Mexico region have rifting initiating in the Late Triassic or Early Jurassic, with seafloor spreading beginning ~166-154 Ma in the western Gulf, propagating to the eastern Gulf, and ending ~154-135 Ma. Many models include transform motion along the Florida margin during initiation of continental rifting. We observe a strong change in rifting style from west to east across the ocean basin. Our western profile, offshore Texas, images highly heterogeneous crust with sediment velocities directly overlying Moho in some locations. These observations are consistent with either sedimentary basins within rifted continental crust or ultra-slow-spreading oceanic crust. The profile offshore Lousiana images thicker, faster, and more homogeneous crust. This could suggest an eastward increase in magmatic output during rifting. The eastern profiles offshore Alabama and Florida image the ocean-continent boundary and extensive regions of oceanic crust. The thickness of crystalline crust from the continental shelf to the deep basin decreases from ~25 km to 6-7 km over a horizontal distance of 150 km in the eastern Gulf of Mexico. The profile offshore Alabama, near a region where syn-rift volcanism has been interpreted on seismic reflection data, has

  14. Estimation of the spectral parameter kappa in the region of the Gulf of California, Mexico

    NASA Astrophysics Data System (ADS)

    Castro, Raúl R.; Ávila-Barrientos, Lenin

    2015-10-01

    We analyzed records from the Broadband Seismological Network of the Gulf of California (RESBAN) and from stations of the NARS-Baja array, operated by CICESE, Ensenada, Baja California, Mexico, to make estimates of the spectral decay parameter kappa ( κ). This attenuation parameter is important for evaluating the seismic risk and hazard of this region. Thirteen shallow earthquakes with focal depths less than 20 km and magnitudes between 5.1 and 6.6 were selected to calculate κ and the near-site attenuation κ 0. We used three different approaches to estimate κ 0: (a) with individual measurements of κ from vector modulus of three-component spectral amplitudes at different epicentral distances and extrapolating to zero distance to estimate κ 0, (b) with individual measurements using vertical component spectra, and (c) measuring from the high-frequency part of the site transfer function determined calculating the horizontal-to-vertical spectral ratio (HVSR) method. For most stations, the three methods give similar results. At short distances (50-60 km), κ takes values close to 0.04 s at NE76, the station located in the middle of the array. κ increases with distance taking an average value of up to 0.18 s for distances close to 500 km. κ 0 at most sites is close to 0.03 s, except for GUYB (Guaymas) that has a κ 0 = 0.05 s and NE83 (Navolato) with κ 0 = 0.065 s, both stations located in the continent, on the eastern side of the gulf, where the soils are less consolidated. Finally, we analyze if κ 0 correlates with magnitude and back azimuth, and we found that for most stations, κ 0 does not correlate with either one. However, station TOPB, located on basalt, shows a moderate correlation with magnitude, with κ 0 increasing with increasing M W in a short back-azimuth range. We also found that for station NE74, located on soft soil, κ 0 correlates with back azimuth, having lower values for azimuths near 120°.

  15. In Brief: Gulf of Mexico hypoxia plan

    NASA Astrophysics Data System (ADS)

    Showstack, Randy

    2008-06-01

    On 16 June, the Mississippi River/Gulf of Mexico Watershed Nutrient Task Force released an action plan to reduce, mitigate, and control hypoxia in the northern Gulf of Mexico. The plan builds upon a 2001 plan by including more accountability through an annual operating plan, better tracking of progress, and state and federal nutrient reduction strategies. ``Our improved plan unites governments and citizens across the country to take action upstream and along the coast to reduce river nutrient pollution and increase Gulf of Mexico health,'' said U.S. Environmental Protection Agency assistant administrator for water Benjamin Grumbles. For more information, visit http://www.epa.gov/msbasin/.

  16. Nested Gulf of Mexico Modeling with HYCOM

    DTIC Science & Technology

    2005-12-08

    Nested Gulf of Mexico Modeling with HYCOM Patrick J. Hogan Alan J. Wallcraft Naval Research Laboratory Stennis Space Center, MS HYCOM Meeting...valid OMB control number. 1. REPORT DATE DEC 2005 2. REPORT TYPE 3. DATES COVERED 00-00-2005 to 00-00-2005 4. TITLE AND SUBTITLE Nested Gulf of Mexico Modeling...topography is from NRL-DBDB2 • Integrated over 2000-2001 1/25° (~4 km) non-assimilative Nested Gulf of Mexico Possible cross-shelf transport

  17. Gulf of Mexico

    Atmospheric Science Data Center

    2014-05-15

    ... pattern of land and runoff is associated with the Chandeleur Islands, which are part of the Breton National Wildlife Refuge. This refuge is ... later, this image shows filaments of oil crossing the island barrier -- which had been heavily eroded by Hurricane Katrina in 2005 -- and ...

  18. Gulf of Mexico

    Atmospheric Science Data Center

    2014-05-15

    ... significant oil spill from the well nearly a mile below the ocean surface. The Multi-angle Imaging SpectroRadiometer (MISR) instrument ... point. These correspond to boats that are assisting with the cleanup effort.   The sensitivity of MISR's multiangle imaging to the ...

  19. COASTAL NUTRIENT CRITERIA DEVELOPMENT: GULF OF MEXICO

    EPA Science Inventory

    The modeling, monitoring and research provided in this presentation is the EPA and ORD response to the Hypoxia Action Plan, associated legislation, and the President's Ocean Commission Report as it related to the Gulf of Mexico.

  20. GULF OF MEXICO AQUATIC MORTALITY NETWORK (GMNET)

    EPA Science Inventory

    Five U.S. states share the northern coast of the Gulf, and each has a program to monitor mortalities of aquatic organisms (fish, shellfish, birds). However, each state has different standards, procedures, and documentation of mortality events. The Gulf of Mexico Aquatic Mortality...

  1. 75 FR 15665 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-03-30

    ..., Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of Mexico; Red Snapper Management.... SUPPLEMENTARY INFORMATION: The reef fish fishery of the Gulf of Mexico is managed under the FMP. The FMP was... of the Gulf of Mexico (FMP) prepared by the Gulf of Mexico Fishery Management Council......

  2. Nitrogen input to the Gulf of Mexico

    USGS Publications Warehouse

    Goolsby, D.A.; Battaglin, W.A.; Aulenbach, Brent T.; Hooper, R.P.

    2001-01-01

    Historical streamflow and concentration data were used in regression models to estimate the annual flux of nitrogen (N) to the Gulf of Mexico and to determine where the nitrogen originates within the Mississippi Basin. Results show that for 1980-1996 the mean annual total N flux to the Gulf of Mexico was 1 568 000 t yr-1. The flux was about 61% nitrate N, 37% organic N, and 2% ammonium N. The flux of nitrate N to the Gulf has approximately tripled in the last 30 years with most of the increase occurring between 1970 and 1983. The mean annual N flux has changed little since the early 1980s, but large year-to-year variations in N flux occur because of variations in precipitation. During wet years the N flux can increase by 50% or more due to flushing of nitrate N that has accumulated in the soils and unsaturated zones in the basin. The principal source areas of N are basins in southern Minnesota, Iowa, Illinois, Indiana, and Ohio that drain agricultural land. Basins in this region yield 1500 to more than 3100 kg N km-2 yr-1 to streams, several times the N yield of basins outside this region.

  3. Nitrogen input to the Gulf of Mexico.

    PubMed

    Goolsby, D A; Battaglin, W A; Aulenbach, B T; Hooper, R P

    2001-01-01

    Historical streamflow and concentration data were used in regression models to estimate the annual flux of nitrogen (N) to the Gulf of Mexico and to determine where the nitrogen originates within the Mississippi Basin. Results show that for 1980-1996 the mean annual total N flux to the Gulf of Mexico was 1,568,000 t yr-1. The flux was about 61% nitrate N, 37% organic N, and 2% ammonium N. The flux of nitrate N to the Gulf has approximately tripled in the last 30 years with most of the increase occurring between 1970 and 1983. The mean annual N flux has changed little since the early 1980s, but large year-to-year variations in N flux occur because of variations in precipitation. During wet years the N flux can increase by 50% or more due to flushing of nitrate N that has accumulated in the soils and unsaturated zones in the basin. The principal source areas of N are basins in southern Minnesota, Iowa, Illinois, Indiana, and Ohio that drain agricultural land. Basins in this region yield 1500 to more than 3100 kg N km-2 yr-1 to streams, several times the N yield of basins outside this region.

  4. Cooperative Management of Transboundry Oil and Gas Resources in the Maritime Boundary Region of the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    McLaughlin, R. J.

    2007-05-01

    Finding and exploiting oil and gas resources in the ultra-deepwater areas of the Gulf of Mexico is occurring at an accelerated pace. Huge new discoveries have recently been made in a large geological structure known as the Lower Tertiary Wilcox Trend that is located in the U.S.-Mexico Maritime Boundary Region. These discoveries have been projected to boost current U.S. oil reserves by as much as fifty percent. Technological advancements and market conditions have finally reached a point where production of hydrocarbons in these ultra-deepwaters is commercially feasible. However, due to the transboundary characteristics of many of these hydrocarbons, some form of bi-national cooperation is necessary to effectively manage the shared resources, protect the oceanic environment and comply with evolving norms of international law before commercial production can begin. Well established international customary norms prohibit unilateral exploitation of transboundary oil and gas resources. Consequently, it is important for the two nations to address these issues today rather than putting them off until they become a critical political problem in their bilateral relations. The United States and Mexico have already agreed to temporarily cooperate in the exploration of potential oil and gas resources in one portion of the Gulf of Mexico known as the Western Gap. This is an area in the center of the Gulf of Mexico that falls outside of the 200 mile exclusive economic zones of the two nations. After scientific studies provided evidence that the Western Gap qualifies as part of each nation's extended continental shelf, a Delimitation Treaty was negotiated and ratified in 2000. This Treaty gave Mexico access to about 62 percent of the Gap, while the U.S. retained about 38 percent. The Treaty also established a 2.8 nautical mile buffer zone along the new boundary to account for the possibility that straddling oil and gas reservoirs may be located there. The nations agreed to a ten

  5. Verification of the Gulf of Mexico Hindcast Wave Information

    DTIC Science & Technology

    1992-09-01

    The Wave Information Study (WIS) for the Gulf of Mexico (WIS Report 18) provides a wave climate for the US shorelines of the Gulf of Mexico based on...conditions. In 1991, CERC conducted a 1-year hindcast of the Gulf of Mexico for the year 1988 and evaluated the model results against extensive wind and wave...and guidance on the use of the earlier WIS study.... Gulf of Mexico , Hindcast, Waves.

  6. 75 FR 28760 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-24

    ..., Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of Mexico; Amendment 31; Correction... implement Amendment 31 to the Fishery Management Plan for the Reef Fish Resources of the Gulf of Mexico...

  7. Deep Crustal Structure Northeastern Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Christeson, Gail; Eddy, Drew; van Avendonk, Harm; Norton, Ian; Karner, Garry; Johnson, Chris; Kneller, Erik; Snedden, John

    2013-04-01

    The Gulf of Mexico is a small ocean basin between the US and Mexico that opened up soon after the breakup of Pangea. Although the area has been heavily surveyed with seismic reflection profiles, the deep structure of the region is poorly understood because of lack of penetration beneath the thick sediments and salt. We present the results of two wide-angle seismic refraction profiles in the northeastern Gulf of Mexico that constrain seismic velocities and thicknesses of the sediments and crust from the continental shelf to deep ocean basin. Profile GUMBO 3 extends 523 km from offshore Alabama south-southwest via the De Soto Canyon to the central Gulf of Mexico, while GUMBO 4 extends 507 km from the northwestern Florida peninsula across the Florida Escarpment to the central Gulf of Mexico. On both profiles, ocean bottom seismometers were positioned at 12-km spacing, and recorded air gun shots at offsets >100 km. We use a tomographic inversion of first-arrival and secondary travel time picks from these data to build a layered velocity model (water, sediments, crystalline crust, mantle) along each profile. On GUMBO 3 and GUMBO 4 the thickness of crystalline crust from the continental shelf to the deep basin decreases from ~25 km to ~7 km (GUMBO 4) or ~8 km (GUMBO 3) over a horizontal distance of ~150 km. Velocities of 7-7.5 km/s are observed at the base of the crust along most of GUMBO 3, while velocities of 6.5-7 km/s are observed at similar depths along GUMBO 4. We suggest that higher lower crustal velocities, and thicker oceanic crust, on GUMBO 3 compared to GUMBO 4 may be explained by elevated syn-rift mantle temperatures in the vicinity of the De Soto Canyon and South Georgia Rift during rifting and continental breakup. We have integrated seismic refraction, seismic reflection, and well data to interpret sequence stratigraphic units along GUMBO 3 and GUMBO 4. We have constructed a geologic history of the late-Jurassic/early-Cretaceous, beginning first with Louann

  8. Gulf of Mexico dead zone - the last 150 years

    USGS Publications Warehouse

    Osterman, Lisa; Swarzenski, P.W.; Poore, R.Z.

    2006-01-01

    'Gulf of Mexico Dead Zone-The Last 150 Years' discusses the dead zone that forms seasonally in the northern Gulf of Mexico when subsurface waters become depleted in dissolved oxygen and cannot support most life.

  9. Environmental and economic assessment of discharges from Gulf of Mexico Region oil and gas operation. Quarterly technical progress report, 1 October--31 December 1994

    SciTech Connect

    Gettleson, D.A.

    1995-01-18

    Task 3 (Environmental Field Sampling and Analysis of NORM, Heavy Metals, and Organics) work included analyses of samples. Task 4 (Monitoring of the Recovery of Impacted Wetland and Open Bay Produced Water Discharge Sites in Coastal Louisiana and Texas) activities involved the continued analyses of samples and field sampling at Bay de Chene. Task 5 (Assessment of Economic Impacts of Offshore and Coastal Discharge Requirements on Present and Future Operations in the Gulf of Mexico Region) activities included preparing a draft final report. Task 6 (Synthesis of Gulf of Mexico Seafood Consumption and Use Patterns) work also involved preparing a draft final report. Task 7 (Technology Transfer Plan) activities included a presentation at the Minerals Management Service Information Transfer Meeting for the Gulf of Mexico OCS Region. Task 8 (Project Management and Deliverables) activities involved the submission of the necessary reports and routine management.

  10. [Aquatic insects in dune lakes of the central region of the Gulf of Mexico].

    PubMed

    Peralta, Luis A; Deloya, Cuauhtémoc; Moreno-Casasola, Patricia

    2007-01-01

    The aim of this study is to register the presence of aquatic insects during the rainy and dry seasons, in 15 dune lakes of the Gulf of Mexico's coastal zone. These ecosystems lodge a wealth of 62 families, 60 of them present during the rainy season and 46 during the dry period. At both times Coleoptera is the order with a greater number of families, followed by Diptera. The first one is the most diverse, but Chironomidae (Diptera) is the most abundant, representing 40% of the total number of individuals. We used high rank taxa to quantify the biodiversity based on the principle that a high number of families or genus is supposed to include a greater number of species. There were not significant differences in the alpha diversity within the same lake during the two climatic seasons. The trophic structure is dominated by the detritivorous groups (57% of scrapers, collectors, gatherers, shredders), followed by predators (38%) and herbivores (5%). These numbers indicate that dune lakes have a great amount of organic matter. The results obtained contradict our working hypothesis, thus it was rejected, in summary, because there were no important differences in family composition, abundance of individuals and trophic structure of the lakes between the rainy and dry seasons.

  11. 76 FR 68339 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-11-04

    ..., Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of Mexico; Amendment 26 and Amendment... commercial sector of the reef fish fishery in the Gulf of Mexico (Gulf) exclusive economic zone (EEZ... . SUPPLEMENTARY INFORMATION: The reef fish fishery of the Gulf of Mexico is managed under the FMP.......

  12. Permo-Triassic reconstruction of western Pangea and the evolution of the Gulf of Mexico&solCaribbean region

    NASA Astrophysics Data System (ADS)

    Pindell, James; Dewey, John F.

    1982-04-01

    A Permo-Triassic reconstruction of western Pangea (North America, South America, Africa) is proposed that is characterized by (1) definition of the North Atlantic fit by matching of marginal offsets (fracture zones) along the opposing margins, (2) a South Atlantic fit that is tighter than the BuIlard fit and that is achieved by treating Africa as two plates astride the Benue Trough and related structures during the Cretaceous, (3) complete closure of the Proto-Atlantic Ocean between North and South America, accomplished by placing the Yucatan block between the Ouachita Mountains and Venezuela, (4) a proposed Hercynian suture zone that separates zones of foreland thrusting from zones of arc-related magmatic activity; to the northwest of this suture lie the Chortis block and Mexico and most of North America, and to the southeast lie South America, the Yucatan Block, Florida and Africa, and (5) satisfaction of paleomagmatic data from North America, South America, and Africa. Beginning with the proposed reconstruction, the relative motion history of South America with respect of North America is defined by using the finite difference method. Within the framework provided by the proposed relative motion history, an evolutionary model for the development of the Gulf of Mexico and Caribbean region is outlined in a series of 13 plate boundary reconstructions at time intervals from the Jurassic to the present. The model includes (1) formation of the Gulf of Mexico by 140 Ma, (2) Pacific provenance of the Caribbean plate through the North America-South America gap during Cretaceous time, (3) Paleocene-Early Eocene back arc spreading origin for the Yucatan Basin, whereby Cuba is the frontal arc and the Nicaragua Rise-Jamaica-Southern Hispaniola is the remnant arc, and (4) 1200 km of post-Eocene cumulative offset along both the Northern and Southern Caribbean Plate Boundary Zones, allowing large-scale eastward migration of the Caribbean plate with respect to the North and

  13. Forest dynamics to precipitation and temperature in the Gulf of Mexico coastal region

    NASA Astrophysics Data System (ADS)

    Li, Tianyu; Meng, Qingmin

    2016-11-01

    The forest is one of the most significant components of the Gulf of Mexico (GOM) coast. It provides livelihood to inhabitant and is known to be sensitive to climatic fluctuations. This study focuses on examining the impacts of temperature and precipitation variations on coastal forest. Two different regression methods, ordinary least squares (OLS) and geographically weighted regression (GWR), were employed to reveal the relationship between meteorological variables and forest dynamics. OLS regression analysis shows that changes in precipitation and temperature, over a span of 12 months, are responsible for 56% of NDVI variation. The forest, which is not particularly affected by the average monthly precipitation in most months, is observed to be affected by cumulative seasonal and annual precipitation explicitly. Temperature and precipitation almost equally impact on NDVI changes; about 50% of the NDVI variations is explained in OLS modeling, and about 74% of the NDVI variations is explained in GWR modeling. GWR analysis indicated that both precipitation and temperature characterize the spatial heterogeneity patterns of forest dynamics.

  14. Forest dynamics to precipitation and temperature in the Gulf of Mexico coastal region

    NASA Astrophysics Data System (ADS)

    Li, Tianyu; Meng, Qingmin

    2017-05-01

    The forest is one of the most significant components of the Gulf of Mexico (GOM) coast. It provides livelihood to inhabitant and is known to be sensitive to climatic fluctuations. This study focuses on examining the impacts of temperature and precipitation variations on coastal forest. Two different regression methods, ordinary least squares (OLS) and geographically weighted regression (GWR), were employed to reveal the relationship between meteorological variables and forest dynamics. OLS regression analysis shows that changes in precipitation and temperature, over a span of 12 months, are responsible for 56% of NDVI variation. The forest, which is not particularly affected by the average monthly precipitation in most months, is observed to be affected by cumulative seasonal and annual precipitation explicitly. Temperature and precipitation almost equally impact on NDVI changes; about 50% of the NDVI variations is explained in OLS modeling, and about 74% of the NDVI variations is explained in GWR modeling. GWR analysis indicated that both precipitation and temperature characterize the spatial heterogeneity patterns of forest dynamics.

  15. Forest dynamics to precipitation and temperature in the Gulf of Mexico coastal region.

    PubMed

    Li, Tianyu; Meng, Qingmin

    2017-05-01

    The forest is one of the most significant components of the Gulf of Mexico (GOM) coast. It provides livelihood to inhabitant and is known to be sensitive to climatic fluctuations. This study focuses on examining the impacts of temperature and precipitation variations on coastal forest. Two different regression methods, ordinary least squares (OLS) and geographically weighted regression (GWR), were employed to reveal the relationship between meteorological variables and forest dynamics. OLS regression analysis shows that changes in precipitation and temperature, over a span of 12 months, are responsible for 56% of NDVI variation. The forest, which is not particularly affected by the average monthly precipitation in most months, is observed to be affected by cumulative seasonal and annual precipitation explicitly. Temperature and precipitation almost equally impact on NDVI changes; about 50% of the NDVI variations is explained in OLS modeling, and about 74% of the NDVI variations is explained in GWR modeling. GWR analysis indicated that both precipitation and temperature characterize the spatial heterogeneity patterns of forest dynamics.

  16. Gulf of Mexico production still recovering

    SciTech Connect

    Koen, A.D.

    1992-10-12

    This paper reports that the extent of damage caused by Hurricane Andrew to Gulf of Mexico oil and gas installations continues coming into focus. A preliminary tally by Minerals Management Service offers a reasonably complete summary of gulf production and pipeline systems damage detectable at the surface. MMS requires Outer Continental Shelf operators to inspect for underwater damage all platforms, pipelines, risers, and other structures within an 85 mile corridor along the path of Andrew's eye as it churned through the gulf. OCS operators have until Oct. 16 to submit plans for the Level II surveys.

  17. Why is Improving Water Quality in the Gulf of Mexico so Critical?

    EPA Pesticide Factsheets

    The EPA regional offices and the Gulf of Mexico Program work with Gulf States to continue to maximize the efficiency and utility of water quality monitoring efforts for local managers by coordinating and standardizing state and federal water quality data

  18. Genetic identification of istiophorid larvae from the Gulf of Mexico based on the analysis of mitochondrial DNA control region sequences.

    PubMed

    McKenzie, J L; Alvarado Bremer, J R

    2017-03-01

    Assigning relative importance of spawning and nursery habitats for threatened and endangered teleosts, such as those seen in the Gulf of Mexico (GoM), relies on the proper identification of the early life-history stages of the species of concern. Here, sequencing a portion of the mitochondrial DNA (mtDNA) control region (CR) I as barcodes is recommended to identify istiophorid (billfish) larvae in the Atlantic Ocean because of its high resolution and the intrinsic value of the levels of genetic variation that can be extracted from these data. The universality of the primers employed here demonstrates their utility for not only the positive identification of istiophorids in the GoM, but for any larval teleost occurring in areas recognized as larval hotspots worldwide. © 2016 The Fisheries Society of the British Isles.

  19. 76 FR 54375 - Safety Zone; Thunder on the Gulf, Gulf of Mexico, Orange Beach, AL

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-09-01

    ... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; Thunder on the Gulf, Gulf of Mexico, Orange... establishing a temporary safety zone for a portion of the Gulf of Mexico for the waters off Orange Beach... Mexico, south of Orange Beach, Alabama to occur from October 6, 2011 through October 9, 2011. This event...

  20. Jurassic platform development, northwestern Gulf of Mexico

    SciTech Connect

    Moore, C.H. Jr.

    1987-05-01

    Triassic and Early Jurassic rifting set the stage for the subsequent development of carbonate platforms in the Late Jurassic. These platforms formed along the interior margins of salt basins separated from the main ancestral Gulf of Mexico by a series of positive features. A major sea level rise, after deposition of the Louann Salt (late Callovian), drowned the interior salt basins around the margins of the Gulf of Mexico, leading to an anoxic event. Organic-rich sediments of the lower Smackover were deposited as a basin-fill sequence, forming one of the major hydrocarbon source rocks of the region. As sea level rise slowed in the late Oxfordian, carbonate production began to catch up with sea level rise along the basin margins, leading to the initial development of a rimmed carbonate platform. The platform margin was marked by high-energy ooid grainstones, while crustacean pellet muds were deposited in the platform interior. A high-energy ooid-dominated platform (upper Smackover) developed in the late Oxfordian when sea level reached a standstill. During the subsequent Kimmeridgian sea level rise, a second rimmed carbonate platform, the Haynesville, was developed. During the initial rise, grainstones were deposited on the platform margin, while the interior was dominated by evaporites (Buckner) and siliciclastics. As sea level slowed and reached a standstill, the platform margin facies extended shoreward (Gilmer) and a high-energy platform, analogous to the upper Smackover, was formed. The Smackover and Haynesville platforms of the northwestern gulf show a parallel evolution in response to cyclic changes in Upper Jurassic sea level.

  1. NOAA tools to support CSC and LCC regional climate science priorities in the western Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Brown, D. P.; Marcy, D.; Robbins, K.; Shafer, M.; Stiller, H.

    2012-12-01

    The National Oceanic and Atmospheric Administration (NOAA) is an active regional partner with the Department of Interior (DOI) in supplying and supporting the delivery of climate science and services. A primary mechanism for NOAA-DOI coordination at the regional scale is the Landscape Conservation Cooperative (LCC) network, which is supported in part by DOI Climate Science Centers (CSC). Together, the CSCs and LCCs provide a framework to identify landscape-scale science and services priorities for conservation and management. As a key partner of the CSCs and an active member of many LCCs, NOAA is working to ensure its own regional product and service delivery efforts will help address these conservation and management challenges. Two examples of NOAA's regional efforts are highlighted here, with a focus on the coastal and interior geographies of the western Gulf of Mexico where NOAA partners with the South Central CSC and participates as a member of the Gulf Coast Prairie LCC. Along the Texas coastline, a sea level rise and coastal flooding impacts viewer, produced by NOAA's Coastal Services Center and available via its Digital Coast interface, allows constituents to visualize estimates of sea level rise, measures of uncertainty, flood frequencies, and environmental (e.g., marsh migration) and socioeconomic (e.g., tidal flooding of built environments) impacts. In the interior of Texas and Louisiana, NOAA's Southern Regional Climate Center is leading a consortium of partners in the development of a unified source of regional water reservoir information, including current conditions, a historical database, and web-based visualization tools to illustrate spatio-temporal variations in water availability to a broad array of hydrological, agricultural, and other customers. These two examples of NOAA products can, in their existing forms, support regional conservation and management priorities for CSCs and LCCs by informing vulnerability assessments and adaptation

  2. Ecologic Atlas of Benthic Foraminifera of the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Tietjen, John H.

    Because of their importance as indicators of petroleum deposits, the benthic foraminifera of the Gulf of Mexico are one of the most intensely studied groups of animals in the world. This is especially true of the foraminifera inhabiting the shallow shelf region of the northern and eastern Gulf; much less is known about the animals of the southern shelf, continental slope, and abyssal plains. The author spent 10 years examining collections from various not well-known areas of the Gulf; this atlas is a synthesis of distributional data from approximately 4500 previously known stations, plus new information from 400 additional stations.

  3. ROE Gulf of Mexico Hypoxia Sample Locations

    EPA Pesticide Factsheets

    This dataset describes dissolved oxygen levels in the Gulf of Mexico. Individual sampling sites are represented by point data. The background polygon shows areas where the dissolved oxygen concentration is less than 2.0 milligrams per liter. The data were collected during the summer of 2014 by the Louisiana Universities Marine Consortium (LUMCON).

  4. Sulfur biogeochemistry of cold seeps in the Green Canyon region of the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Formolo, Michael J.; Lyons, Timothy W.

    2013-10-01

    Cold seeps in the Gulf of Mexico provide a natural laboratory to study biogeochemical cycling of sulfur, carbon, and oxygen at hydrate- and hydrocarbon-rich deep marine settings with obvious additional relevance to studies of diverse modern and ancient seeps. Of particular interest are the sulfur isotope signatures of microbial sulfate reduction coupled to anaerobic oxidation of methane and other non-methane liquid and gaseous hydrocarbons. Whereas most of the published sulfur isotope data from cold seep systems pertain to pore-water species, our study integrates both solid and dissolved sulfur: acid-volatile sulfides (SAVS), pyrite (Spy), elemental sulfur (S°), dissolved sulfate and ΣH2S. Modeled and 35SO42- reduction rates and δ13C and δ18O data for authigenic carbonates are integrated within this sulfur framework. Our results indicate extreme variability over narrow spatial and temporal scales within short distances (meters) from active seeps. High rates of microbial sulfate reduction can lead to complete consumption of the sulfate within the upper few centimeters of burial, while meters away the sulfate profile shows little depletion. Such small-scale variability must reflect the structure and temporal dynamics of hydrocarbon migration in the presence of low amounts of background organic matter. Our past work demonstrated that electron donors other than methane drive significant levels of microbial activity at these seeps, and very recent work has demonstrated that oxidation of higher chain volatile hydrocarbons can contribute to the high levels of microbial activity. These findings are consistent with our new results. Elevated concentrations of pyrite and diagenetic carbonate relative to background sediments are diagnostic of active seepage, yet the S isotopes tell more complex stories. Low levels of the transient, 'instantaneous' products of S cycling-AVS and S°-show high δ34S values that increase with depth. Most of the pyrite formation, however, seems

  5. Gulf of Mexico region - Highlighting low-lying areas derived from USGS Digital Elevation Data

    USGS Publications Warehouse

    Kosovich, John J.

    2008-01-01

    In support of U.S. Geological Survey (USGS) disaster preparedness efforts, this map depicts a color shaded relief representation of the area surrounding the Gulf of Mexico. The first 30 feet of relief above mean sea level are displayed as brightly colored 5-foot elevation bands, which highlight low-elevation areas at a coarse spatial resolution. Standard USGS National Elevation Dataset (NED) 1 arc-second (nominally 30-meter) digital elevation model (DEM) data are the basis for the map, which is designed to be used at a broad scale and for informational purposes only. The NED data were derived from the original 1:24,000-scale USGS topographic map bare-earth contours, which were converted into gridded quadrangle-based DEM tiles at a constant post spacing (grid cell size) of either 30 meters (data before the mid-1990s data) or 10 meters (mid-1990s and later data). These individual-quadrangle DEMs were then converted to spherical coordinates (latitude/longitude decimal degrees) and edge-matched to ensure seamlessness. Approximately one-half of the area shown on this map has DEM source data at a 30-meter resolution, with the remaining half consisting of 10-meter contour-derived DEM data or higher-resolution LIDAR data. Areas below sea level typically are surrounded by levees or some other type of flood-control structures. State and county boundary, hydrography, city, and road layers were modified from USGS National Atlas data downloaded in 2003. The NED data were downloaded in 2005.

  6. Beyond SHARP-- Primary Formaldehyde from Oil and Gas Exploration and Production in the Gulf of Mexico Region

    NASA Astrophysics Data System (ADS)

    Olaguer, E. P.

    2010-12-01

    Formaldehyde has been named by the EPA as a hazardous air pollutant that may be carcinogenic and also cause irritation to the eyes, nose, throat and lung. Moreover, it is a powerful radical and ozone precursor. The 2009 Study of Houston Atmospheric Radical Precursors (SHARP) was conceived by the Houston Advanced Research Center (HARC) on behalf of the Texas Environmental Research Consortium (TERC) to examine the relative importance of primary and secondary formaldehyde (HCHO) and nitrous acid (HONO) in ozone formation. SHARP confirmed that primary combustion sources of HCHO, such as flares end engines, may be underestimated (by an order of magnitude or more) in official emission inventories used for the purpose of air quality modeling in highly industrialized areas such as Houston. This presentation provides recently generated modeling and observational evidence that the same may be true in both rural and urban areas with oil and gas exploration and production (E&P) activities, such as the Upper Green River Basin of Wyoming and the Barnett Shale of Texas. Oil and gas E&P is increasing in the Gulf of Mexico region, particularly in the Barnett, Haynesville, Eagle Ford, Cana-Woodford, and Fayetteville shale basins. In the Barnett Shale, E&P activities are moving into urban neighborhoods, and may affect the ability to bring the Dallas-Ft. Worth region into attainment of the federal ozone standard. Data concerning formaldehyde emissions from drill rig and pipeline compressor engines, flares, and glycol or amine reboilers, should be obtained in order to more accurately model air quality in the Gulf of Mexico region.

  7. GULF OF MEXICO HYPOXIA MONITORING AND MODELING

    EPA Science Inventory

    Greene, Richard M. and Russell G. Kreis. In press. Gulf of Mexico Hypoxia Monitoring and Modeling (Abstract). To be presented at the EPA Science Forum: Healthy Communities and Ecosystems, 1-3 June 2004, Washington, DC. 1 p. (ERL,GB R990).

    Oxygen-depleted or hypoxic bottom...

  8. TRAINING - WATER EGRESS - GULF OF MEXICO

    NASA Image and Video Library

    1965-04-14

    S65-22655 (14 April 1965) --- The Gemini-Titan 4 prime crew is shown aboard the NASA Motor Vessel Retriever in the Gulf of Mexico suiting up for water egress training. Astronaut James A. McDivitt (left) is the command pilot, and astronaut Edward H. White II is the pilot.

  9. GULF OF MEXICO HYPOXIA MONITORING AND MODELING

    EPA Science Inventory

    Greene, Richard M. and Russell G. Kreis. In press. Gulf of Mexico Hypoxia Monitoring and Modeling (Abstract). To be presented at the EPA Science Forum: Healthy Communities and Ecosystems, 1-3 June 2004, Washington, DC. 1 p. (ERL,GB R990).

    Oxygen-depleted or hypoxic bottom...

  10. Mercury in the Gulf of Mexico: sources to receptors.

    PubMed

    Harris, Reed; Pollman, Curtis; Landing, William; Evans, David; Axelrad, Donald; Hutchinson, David; Morey, Steven L; Rumbold, Darren; Dukhovskoy, Dmitry; Adams, Douglas H; Vijayaraghavan, Krish; Holmes, Christopher; Atkinson, R Dwight; Myers, Tom; Sunderland, Elsie

    2012-11-01

    Gulf of Mexico (Gulf) fisheries account for 41% of the U.S. marine recreational fish catch and 16% of the nation's marine commercial fish landings. Mercury (Hg) concentrations are elevated in some fish species in the Gulf, including king mackerel, sharks, and tilefish. All five Gulf states have fish consumption advisories based on Hg. Per-capita fish consumption in the Gulf region is elevated compared to the U.S. national average, and recreational fishers in the region have a potential for greater MeHg exposure due to higher levels of fish consumption. Atmospheric wet Hg deposition is estimated to be higher in the Gulf region compared to most other areas in the U.S., but the largest source of Hg to the Gulf as a whole is the Atlantic Ocean (>90%) via large flows associated with the Loop Current. Redistribution of atmospheric, Atlantic and terrestrial Hg inputs to the Gulf occurs via large scale water circulation patterns, and further work is needed to refine estimates of the relative importance of these Hg sources in terms of contributing to fish Hg levels in different regions of the Gulf. Measurements are needed to better quantify external loads, in-situ concentrations, and fluxes of total Hg and methylmercury in the water column, sediments, and food web.

  11. SAR observations in the Gulf of Mexico

    NASA Technical Reports Server (NTRS)

    Sheres, David

    1992-01-01

    The Gulf of Mexico (GOM) exhibits a wealth of energetic ocean features; they include the Loop Current with velocities of about 2 m/s and strong shear fronts, mesoscale eddies, double vortices, internal waves, and the outflow of the 'Mighty Mississippi' river. These energetic features can have a strong impact on the economies of the states surrounding the Gulf. Large fisheries, oil and gas production as well as pollution transport are relevant issues. These circulation features in the Gulf are invisible to conventional IR and visible satellite imagery during the Summer months due to cloud cover and uniform surface temperatures. Synthetic Aperture Radar (SAR) imagery of the Gulf does penetrate the cloud cover and shows a rich assembly of features there year-round. Below are preliminary results from GOM SAR imagery taken by SEASAT in 1978 and by the AIRSAR program in 1991.

  12. 76 FR 43250 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Stone Crab Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-20

    ..., Gulf of Mexico, and South Atlantic; Stone Crab Fishery of the Gulf of Mexico; Removal of Regulations... Management Plan for the Stone Crab Fishery of the Gulf of Mexico (FMP) and remove its implementing regulations, as requested by the Gulf of Mexico Fishery Management Council (Council). The stone crab fishery...

  13. 76 FR 59064 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Stone Crab Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-09-23

    ..., Gulf of Mexico, and South Atlantic; Stone Crab Fishery of the Gulf of Mexico; Removal of Regulations... for the Stone Crab Fishery of the Gulf of Mexico (FMP) and remove its implementing regulations, as requested by the Gulf of Mexico Fishery Management Council (Council). The stone crab fishery takes place...

  14. 78 FR 46292 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-07-31

    ..., Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of Mexico; Coastal Migratory Pelagic Resources of the Gulf of Mexico and South Atlantic; Abbreviated Framework AGENCY: National Marine Fisheries... framework to the Fishery Management Plans (FMPs) for the Reef Fish Resources of the Gulf of Mexico...

  15. ECOLOGICAL CONDITION OF ESTUARIES IN THE GULF OF MEXICO

    EPA Science Inventory

    The Gulf of Mexico is a vast natural resource that encompasses the coastal areas of western Florida, Alabama, Mississippi, Louisiana and Texas, as well as a portion of Mexico. Many estuaries flow into the Gulf of Mexico and serve as nursery grounds for fish, habitat for a wide va...

  16. ECOLOGICAL CONDITION OF ESTUARIES IN THE GULF OF MEXICO

    EPA Science Inventory

    The Gulf of Mexico is a vast natural resource that encompasses the coastal areas of western Florida, Alabama, Mississippi, Louisiana and Texas, as well as a portion of Mexico. Many estuaries flow into the Gulf of Mexico and serve as nursery grounds for fish, habitat for a wide va...

  17. MAGSAT correlations with geoid anomalies. [western Gulf of Mexico

    NASA Technical Reports Server (NTRS)

    Bowin, C. O. (Principal Investigator)

    1984-01-01

    The MAGSAT data of the Gulf of Mexico were analyzed to define better the possible relation of the negative MAGSAT anomaly there to the negative residual geoid anomaly in the western Gulf of Mexico. The estimated magnetic crystal anomaly pattern has a magnetic low in the region of the residual geoid low, but the shape of the anomalies are different. Since the shape and location of the negative magnetic anomaly are variable depending upon the particular polynomial and curve orders used, the degree of correspondance between the residual geoid and MAGSAT lithosphere anomalies was not established definitively.

  18. Circulation in the Gulf of Mexico: Observations and Models

    NASA Astrophysics Data System (ADS)

    Kumar, Mohi

    2006-02-01

    A new AGU book, Circulation in the Gulf of Mexico: Observations and Models, edited by Wilton Sturges III and Alexis Lugo-Fernandez, compiles the current state of knowledge about physical oceanography in this region. Through 22 papers authored by more than 50 scientists, the book highlights the technologies and methodologies that have revolutionized the field since the last such publication more than 30 years ago, and stresses the importance of fundamental science in understanding and mitigating environmental problems. In this interview, Eos talks with Sturges, a physical oceanographer who has studied circulation in the Gulf of Mexico for more than 30 years.

  19. Shelf Circulation in the Gulf of Mexico.

    DTIC Science & Technology

    2007-11-02

    Gulf of Mexico between 1990 and 1993, are used to describe the seasonal fluctuations in patterns of atmospheric variables from a contemporary set of measurements. Seasonal maps of wind stress based on these measurements resemble wind stress maps based on ship observations, as published by Elliot (1979), rather than maps based on analyses of numerical weather forecasts, as published by Rhodes et a. (1989), particularly near the western boundary of the Gulf. Seasonal maps of wind stress curl are characterized by positive curls over the western and southwestern

  20. 77 FR 22760 - Proposed Information Collection; Comment Request; Southeast Region Gulf of Mexico Electronic...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-04-17

    ... the amount of fishing effort than current methods. Using ELBs to improve estimating fishing effort will help improve estimating bycatch in the Gulf shrimp fleet. II. Method of Collection The electronic... electronic logbook memory chip will be removed from the unit and downloaded at the contractor site in College...

  1. Hypoxia in the Northern Gulf of Mexico

    SciTech Connect

    Dale, Virginia H

    2010-01-01

    Since 1985, scientists have been documenting a hypoxic zone in the Gulf of Mexico each year. The hypoxic zone, an area of low dissolved oxygen that cannot support marine life, generally manifests itself in the spring. Since marine species either die or flee the hypoxic zone, the spread of hypoxia reduces the available habitat for marine species, which are important for the ecosystem as well as commercial and recreational fishing in the Gulf. Since 2001, the hypoxic zone has averaged 16,500 km{sup 2} during its peak summer months, an area slightly larger than the state of Connecticut, and ranged from a low of 8,500 km{sup 2} to a high of 22,000 km{sup 2}. To address the hypoxia problem, the Mississippi River/Gulf of Mexico Watershed Nutrient Task Force (or Task Force) was formed to bring together representatives from federal agencies, states, and tribes to consider options for responding to hypoxia. The Task Force asked the White House Office of Science and Technology Policy to conduct a scientific assessment of the causes and consequences of Gulf hypoxia through its Committee on Environment and Natural Resources (CENR). In 2000 the CENR completed An Integrated Assessment: Hypoxia in the Northern Gulf of Mexico (or Integrated Assessment), which formed the scientific basis for the Task Force's Action Plan for Reducing, Mitigating, and Controlling Hypoxia in the Northern Gulf of Mexico (Action Plan, 2001). In its Action Plan, the Task Force pledged to implement ten management actions and to assess progress every 5 years. This reassessment would address the nutrient load reductions achieved, the responses of the hypoxic zone and associated water quality and habitat conditions, and economic and social effects. The Task Force began its reassessment in 2005. In 2006 as part of the reassessment, USEPA's Office of Water, on behalf of the Task Force, requested that the U.S. Environmental Protection Agency (USEPA) Science Advisory Board (SAB) convene an independent panel to

  2. Variations in river flow to the Gulf of Mexico: implications for paleoenvironmental studies of Gulf of Mexico marine sediments

    USGS Publications Warehouse

    Poore, Richard Z.; Darling, Jessica; Dowsett, Harry J.; Wright, Liana

    2001-01-01

    Analyses of selected gaging station records from the Mississippi River and Rio Grande show that variations in discharge of these rivers into the Gulf of Mexico reflect major flood events and regional-scale drought intervals known from the historical record. Variations in Rio Grande discharge show good correlation with El Ni?o/Southern Oscillation (ENSO) events and short-term variability. Mississippi River discharge does not show correlation with ENSO events or short-term variability. However, Mississippi River discharge does appear to respond to long-term changes in ENSO variability and mean climate state. The link between historical hydrologic extremes and discharge of the Rio Grande and Mississippi River into the Gulf of Mexico indicates that shelf and slope sediments of the Gulf of Mexico contain a long-term record of flood and drought intervals of the Southwestern and Central United States.

  3. Geologic controls on regional and local erosion rates of three northern Gulf of Mexico barrier-island systems

    USGS Publications Warehouse

    Twitchell, David C.; Flocks, James G.; Pendleton, Elizabeth; Baldwin, Wayne E.

    2013-01-01

    The stratigraphy of sections of three barrier island systems in the northeastern Gulf of Mexico (Apalachicola, Mississippi, and Chandeleur) have been mapped using geophysical and coring techniques to assess the influence of geologic variations in barrier lithosomes and adjoining inner shelf deposits on long-term rates of shoreline change at regional and local scales. Regional scale was addressed by comparing average geologic characteristics of the three areas with mean shoreline-change rates for each area. Regionally, differences in sand volume contained within the part of the barrier lithosome above sea level, sand volume on the inner shelf, and to a lesser extent, sediment grain size correlate with shoreline change rates. Larger sand volumes and coarser grain sizes are found where erosion rates are lower. Local scale was addressed by comparing alongshore variations in barrier island and inner shelf geology with alongshore variations in shoreline change. Locally, long-term shoreline change rates are highest directly shoreward of paleovalleys exposed on the inner shelf. While geology is not the sole explanation for observed differences in shoreline change along these three coastal regions, it is a significant contributor to change variability.

  4. OCEANOGRAPHY OF THE GULF OF MEXICO.

    DTIC Science & Technology

    Gulf of Mexico which has been carried on during the past year. Included are reviews of work in physical oceanography, geophysics, geology, geo-chemistry, chemistry, instrumentation, and biofouling. Attention is called to the fact that several special reports have been issued by individual investigators that discuss specific research activities in greater detail. The field work carried out aboard the R/V ALAMINOS is summarized, and publications, papers, and reports resulting from the work are presented.

  5. Deep Eddies in the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Furey, H. H.; Bower, A. S.; Perez-Brunius, P.; Hamilton, P.

    2014-12-01

    A major Lagrangian program is currently underway to map the deep (1500-2500 m) circulation of the entire Gulf of Mexico. Beginning in 2011, more than 120 acoustically tracked RAFOS floats have been released in the eastern, central and western Gulf, many in pairs and triplets. Most floats are programmed to drift for two years, obtaining position fixes and temperature/pressure measurements three times daily. More than 80 floats have completed their missions, and results from the trajectories will be described with a focus on mesoscale eddying behavior. In particular, the first-ever observations of deep energetic anticyclonic eddies (possibly lenses) forming at and separating from a northeastward-flowing boundary current west of Campeche Bank will be discussed. The existence of these eddies has major implications for exchange between the continental slope and interior Gulf. The project is being supported by the U.S. Bureau of Ocean Energy Management (BOEM).

  6. NASA Gulf of Mexico Initiative Hypoxia Research

    NASA Technical Reports Server (NTRS)

    Armstrong, Curtis D.

    2012-01-01

    The Applied Science & Technology Project Office at Stennis Space Center (SSC) manages NASA's Gulf of Mexico Initiative (GOMI). Addressing short-term crises and long-term issues, GOMI participants seek to understand the environment using remote sensing, in-situ observations, laboratory analyses, field observations and computational models. New capabilities are transferred to end-users to help them make informed decisions. Some GOMI activities of interest to the hypoxia research community are highlighted.

  7. Surface Stress Estimation for Study of the Circulation Dynamics of the Gulf of Mexico.

    DTIC Science & Technology

    1981-07-01

    sets of stress estimates for the Gulf of Mexico . Wind stress can be estimated directly from wind observations or indirectly from atmospheric pressure...by using the pressure gradients and the geostrophic relation. In regions where wind data are sparse, as in the Gulf of Mexico , the use of the indirect

  8. Crustal Deformation in the Southwestern Gulf of Mexico: Underthrusting of the Gulf of Mexico beneath Tehuantepec

    NASA Astrophysics Data System (ADS)

    Suarez, Gerardo; Aguilar, Sergio

    2016-04-01

    An array of 45 broad band sensors were installed along the Isthmus of Tehuantepec in southeastern. This experiment, called VEOX, was implemented on August 2007 to March 2009. Data were registered continuously during the whole period. In order to search in the seismic records of the data obtained for crustal events in the Isthmus of Tehuantepec, To this purpose, an STA/LTA algorithm was designed to detect earthquakes with S-P times indicating they occurred close the seismic stations, at crustal or upper mantle depths. During the 18 months that the experiment lasted, about 40 crustal earthquakes were recorded in more than three stations, allowing us to determine a hypo central location. All earthquakes occurring at depths greater than 120 km, within the subjected slab, were discarded. The majority of this crustal or upper mantle activity occurred in the northern part of the Isthmus, along the coast of the Gulf of Mexico or just inland from it. No velocity model exists in the area. Therefore, we tested three different velocity models, including one obtained in an adjacent region and based on seismic refraction data. One of these three models rendered the more stable solutions and smaller errors in the hypocentral locations and was used as the local seismic velocity model. In order to improve the quality of the locations, we experimented using a double difference hypocentral algorithm (HYPODD). There was no noticeable improvement in the quality of the hypocenters using this technique. The best located events suggest a southwestern-dipping zone of seismic seismicity, deepening from the Gulf of Mexico towards the interior of the Isthmus of Tehuantepec. The focal mechanisms of the earthquakes indicate the maximum axis of compresion (P axis) is oriented nearly horizontally and in a southwest-northeast direction. These mechanisms are similar to those observed for earthquakes previously studied in the region on the basis of teleseismic data, such as the Mw 6.9, 29 August

  9. 78 FR 49440 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-08-14

    ...NMFS proposes to implement management measures described in a framework action to the Fishery Management Plan for the Reef Fish Resources of the Gulf of Mexico (FMP), as prepared by the Gulf of Mexico Fishery Management Council (Council). If implemented, this rule would increase the 2013 commercial and recreational quotas for red snapper in the Gulf of Mexico (Gulf) reef fish fishery and......

  10. Coastal Forests of the Gulf of Mexico: A Description and Some Thoughts on Their Conservation

    Treesearch

    W. C. Barrow; L. A. Johnson Randall; M. S. Woodrey; J. Cox; E. Ruelas I.; C. M. Riley; R. B. Hamilton; C. Eberly

    2005-01-01

    Millions of Nearctic-Neotropical landbirds move through the coastal forests of the Gulf of Mexico each spring and autumn as they migrate across and around the gulf. Migration routes in the gulf region are not static—they shift year to year and season to season according to prevailing wind patterns. Given the dynamic nature of migration routes, coastal forests...

  11. Spatial Dynamics of the Blue Crab Spawning Stock in the Gulf of Mexico: Local Processes Driving Regional Patterns.

    NASA Astrophysics Data System (ADS)

    Darnell, M. Z.

    2016-02-01

    Female blue crabs undertake a critical spawning migration seaward, migrating from low-salinity mating habitat to high-salinity waters of the lower estuaries and coastal ocean, where larval survival is highest. This migration occurs primarily through ebb tide transport, driven by an endogenous circatidal rhythm in vertical swimming that is modulated by behavioral responses to environmental cues. Blue crabs are typically considered an estuarine species and fisheries are managed on a state-by-state basis. Yet recent evidence from state and regional fishery independent survey programs suggests that the spawning migration can take females substantial distances offshore (>150 km), and that offshore waters are important spawning grounds for female blue crabs in the Gulf of Mexico. This is especially true in areas where freshwater inflow is high, resulting in low estuarine and coastal salinities. In low-salinity, high-inflow areas (e.g., Louisiana), spawning occurs further offshore while in high-salinity, low-inflow areas (e.g., South Texas), spawning takes place primarily within the estuary. Regional patterns in spawning locations both inshore and offshore are driven by interactions between behavioral mechanisms and local oceanographic conditions during the spawning migration. These environmentally driven differences in spawning locations have implications for larval survival and population connectivity, and emphasize the need for interjurisdictional assessment and management of the blue crab spawning stock.

  12. Regional variation in mercury and stable isotopes of red snapper (Lutjanus campechanus) in the northern Gulf of Mexico, USA.

    PubMed

    Zapp Sluis, Michelle; Boswell, Kevin M; Chumchal, Matthew M; Wells, R J David; Soulen, Brianne; Cowan, James H

    2013-02-01

    The presence of total mercury (Hg) in fish tissue and the potential associated health risks has become a global concern in marine ecosystems. Few studies have examined basin-scale variation in Hg accumulation in marine ecosystems, and determining if Hg concentrations in fish tissue vary across marine ecosystems is a key monitoring question. The present study evaluated Hg concentrations in red snapper (Lutjanus campechanus) tissue across three regions of the northern Gulf of Mexico (Alabama, Louisiana, and Texas, USA) and between two habitat types (oil and gas platforms and nonplatforms) within each region. Nitrogen (δ(15)N), carbon (δ(13)C), and sulfur (δ(34)S) stable isotopes were used to investigate ecological differences that may affect Hg concentrations among regions and between habitats. Mercury concentrations in red snapper tissue were positively correlated with fish total length. Regional differences in Hg concentrations were significant, with fish collected from Alabama having the highest concentrations and fish collected from Louisiana having the lowest. No significant difference existed in Hg concentrations between habitats, suggesting that association with platforms may not be a significant factor contributing to red snapper Hg concentrations. While δ(15)N did not differ significantly among the three regions, Texas red snapper were more enriched in δ(34)S and depleted in δ(13)C compared with Alabama and Louisiana red snapper. Although the majority of red snapper collected in the present study had Hg concentrations below safe consumption guidelines, regional differences suggest that spatially explicit monitoring programs may be important for basin-wide assessments.

  13. Environmental and economic assessment of discharges from Gulf of Mexico Region oil and gas operations. Quarterly technical progress report, 23 June 1992--30 September 1992

    SciTech Connect

    Gettleson, D.A.

    1992-11-10

    A Sampling and Analysis Plan was prepared and submitted to a Scientific Review Committee for comment. Substantial comments relative to study objectives, sampling design, and sampling periods coupled with the passage of Hurricane Andrew precluded the scheduled initiation of sampling at offshore and coastal sites (Tasks 3 -- Environmental Field Sampling and Analysis of Naturally Occurring Radioactive Materials (NORM), Heavy Metals, and Organics and 4 -- Monitoring of the Recovery of Impacted Wetland and Open Bay Produced Water Discharge Sites in Coastal Louisiana and Texas). A proposed revised schedule has been prepared for Tasks 3 and 4. Task 5 (Assessment of Economic Impacts of Offshore and Coastal Discharge Requirements on Present and Future Operations in the Gulf of Mexico Region), activities have involved identification and collection of the necessary data for the economic analysis. Task 6 (Synthesis of Gulf of Mexico Region Consumption and Use Patterns), activities have included near completion of the literature review and a reevaluation of the data collection efforts relative to the wholesaler, process plant, and restaurant components. Task 7 (Technology Transfer Plan), work has been delayed due to the Tasks 3 and 4 delay and cancellation of the annual US Minerals Management Service Gulf of Mexico Region Information Transfer Meeting.

  14. Climate Risk and Vulnerability in the Caribbean and Gulf of Mexico Region: Interactions with Spatial Population and Land Cover Change

    NASA Astrophysics Data System (ADS)

    Chen, R. S.; Levy, M.; Baptista, S.; Adamo, S.

    2010-12-01

    Vulnerability to climate variability and change will depend on dynamic interactions between different aspects of climate, land-use change, and socioeconomic trends. Measurements and projections of these changes are difficult at the local scale but necessary for effective planning. New data sources and methods make it possible to assess land-use and socioeconomic changes that may affect future patterns of climate vulnerability. In this paper we report on new time series data sets that reveal trends in the spatial patterns of climate vulnerability in the Caribbean/Gulf of Mexico Region. Specifically, we examine spatial time series data for human population over the period 1990-2000, time series data on land use and land cover over 2000-2009, and infant mortality rates as a proxy for poverty for 2000-2008. We compare the spatial trends for these measures to the distribution of climate-related natural disaster risk hotspots (cyclones, floods, landslides, and droughts) in terms of frequency, mortality, and economic losses. We use these data to identify areas where climate vulnerability appears to be increasing and where it may be decreasing. Regions where trends and patterns are especially worrisome include coastal areas of Guatemala and Honduras.

  15. Upper Jurassic Norphlet formation: new frontier for hydrocarbon prospecting in the central and eastern Gulf of Mexico regions

    SciTech Connect

    Mancini, E.A.; Mink, R.M.; Bearden, B.L.

    1984-04-01

    Since the discovery of oil in 1967 from the Smackover Formation at Toxey field, Choctaw County, Alabama, and of condensate in 1968 from the Norphlet Formation at Flomaton field, Escambia County, Alabama, the Upper Jurassic has become the primary exploration target in southwestern Alabama. Norphlet petroleum traps in the region are principally combination traps involving favorable stratigraphy and salt anticlines (Copeland field), extensional fault traps associated with salt movement (Flomaton field), and faulted salt anticlines (Hatter's Pond and Lower Mobile Bay-Mary Ann fields). Reservoir rocks include marine, dune, and fluvial sandstone lithofacies. Sandstone porosity involves both primary intergranular and secondary dissolution and fracture. Smackover algal carbonate mudstone is probably the source for much of the Norphlet hydrocarbon, but downdip Norphlet marine shales may also be source rocks. The central and eastern Gulf of Mexico regions should continue to be excellent areas to explore for hydrocarbons in the years ahead. Successful Norphlet petroleum prospecting in the area has involved the identification of favorable sandstone lithofacies and structural hydrocarbon traps by using geologic and geophysical methods. Future Norphlet discoveries will require the delineation of stratigraphic and structural/stratigraphic combination hydrocarbon traps using seismic-stratigraphic techniques.

  16. Upper Jurassic Norphlet formation: new frontier for hydrocarbon prospecting in the central and eastern Gulf of Mexico regions

    SciTech Connect

    Mancini, E.A.; Mink, R.M.; Bearden, B.L.

    1984-04-01

    Since the discovery of oil in 1967 from the Smackover Formation at Toxey field, Choctaw County, Alabama, and of condensate in 1968 from the Norphlet Formation at Flomaton field, Escambia County, Alabama, the Upper Jurassic has become the primary exploration target in southwestern Alabama. Norphlet petroleum traps in the region are principally combination traps involving favorable stratigraphy and salt anticlines (Copeland field), exensional fault traps associated with salt movement (Flomaton field), and faulted salt anticlines (Hatter's Pond and Lower Mobile Bay-Mary Ann fields). Reservoir rocks include marine, dune, and fluvial sandstone lithofacies. Sandstone porosity involves both primary intergranular and secondary dissolution and fracture. Smackover algal carbonate mudstone is probably the source for much of the Norphlet hydrocarbon, but downdip Norphlet marine shales may also be source rocks. The central and eastern Gulf of Mexico regions should continue to be excellent areas to explore for hydrocarbons in the years ahead. Successful Norphlet petroleum prospecting in the area has involved the identification of favorable sandstone lithofacies and structural hydrocarbon traps by using geologic and geophysical methods. Future Norphlet discoveries will require the delineation of stratigraphic and structural/stratigraphic combination hydrocarbon traps using seismic-stratigraphic techniques.

  17. Molecular and biochemical responses of hypoxia exposure in Atlantic croaker collected from hypoxic regions in the northern Gulf of Mexico

    PubMed Central

    Thomas, Peter

    2017-01-01

    A major impact of global climate change has been the marked increase worldwide in the incidence of coastal hypoxia (dissolved oxygen, DO<2.0 mg l-1). However, the extent of hypoxia exposure to motile animals such as fish collected from hypoxic waters as well as their molecular and physiological responses to environmental hypoxia exposure are largely unknown. A suite of potential hypoxia exposure biomarkers was evaluated in Atlantic croaker collected from hypoxic and normoxic regions in the northern Gulf of Mexico (nGOM), and in croaker after laboratory exposure to hypoxia (DO: 1.7 mg l-1). Expression of hypoxia-inducible factor-α, hif-α; neuronal nitric oxide synthase, nNOS; and insulin-like growth factor binding protein, igfbp mRNAs and protein carbonyl (PC, an oxidative stress indicator) content were elevated several-fold in brain and liver tissues of croaker collected from nGOM hypoxic sites. All of these molecular and biochemical biomarkers were also upregulated ~3-10-fold in croaker brain and liver tissues within 1–2 days of hypoxia exposure in controlled laboratory experiments. These results suggest that hif-αs, nNOS and igfbp-1 transcripts and PC contents are useful biomarkers of environmental hypoxia exposure and some of its physiological effects, making them important components for improved assessments of long-term impacts of environmental hypoxia on fish populations. PMID:28886098

  18. High Resolution Modeling of the Gulf of Mexico

    DTIC Science & Technology

    2005-07-01

    circulation in the Gulf of Mexico . The resolution of the ocean model (approx. 4 kilometers) and revolutionary hybrid (quasi-isopycnic) vertical coordinate...relatively cold water near the Yucatan Peninsula, the dynamics of cold-core cyclones and their role in the separation of Loop Current Eddies, and shelf-break processes in the northeastern Gulf of Mexico .

  19. Regional resource depletion and industry activity: The case of oil and gas in the Gulf of Mexico

    USGS Publications Warehouse

    Attanasi, E.D.

    1986-01-01

    Stable and declining oil and gas prices have changed the industry's price expectations and, along with depletion of promising exploration prospects, has resulted in reduced exploration. Even with intensive additional exploration, production in most U.S. areas is expected to decline. What does this imply for the drilling and petroleum industry suppliers in particular regions? How should planners in government and the private sector project and incorporate the consequences of these changes in their strategies? This paper answers these questions for the industry operating in the offshore Gulf of Mexico. Future oil and gas production, as well as demand for offshore drilling and production facilities, are shown to depend on the size distribution of undiscovered fields, their associated production costs, and oil and gas prices. Declining well productivity is a consequence of development of progressively smaller fields so that long-run drilling demand should not decline in proportion to the expected production decline. Calculations show a substantial payoff to the drilling industry, in terms of potential demand increases, if it can develop and implement cost reducing technologies. Implications of these results for other offshore producing areas such as the North Sea are also discussed. ?? 1986.

  20. Paleozoic framework of Gulf of Mexico

    SciTech Connect

    Feldman, M.L.

    1987-05-01

    A Paleozoic proto-Gulf of Mexico was formed by chronologically sequential continental collisions which migrated from northeast to southwest. Initial Ordovician and Devonian orogenies in the Appalachian province were predecessors to the genesis of the proto-Gulf of Mexico during Carboniferous and Permian times in Texas and northern Mexico. A southward-widening ocean existed between the North American ancestral craton and the impinging block. This geometric configuration, supplemented by drag delay along compressional transform margins, caused the prolonged time span between first and final impacts. In the Ouachita and Marathon provinces, triangularly shaped flysch depocenters (or syns of the flysch) with north-plunging axes are postulated to have been the consequences of transform drag and related clockwise rotation of mobile block segments. The composite Muenster arch and the Central Basin platform are structurally analogous vertical block uplifts but of different tectonic age. These uplifts and the associated Anadarko-Ardmore and Delaware-Val Verde aulacogens in Oklahoma and Texas are impingement-related features on the stable cratonic block. An ancestral basement fabric of the North American craton predestined structural development of features such as the Central Basin platform and composite Muenster arch.

  1. Paleozoic framework of Gulf of Mexico

    SciTech Connect

    Feldman, M.L.

    1986-09-01

    A Paleozoic proto-Gulf of Mexico was formed by chronologically sequential continental collisions that migrated from northeast to southwest. Initial Ordovician and Devonian orogenies in the Appalachian province predated the proto-Gulf of Mexico during the Carboniferous and Permian in Texas and northern Mexico. A southward-widening ocean existed between the North American ancestral craton and the impinging block. This geometric configuration, supplemented by drag delay along compressional transform margins, caused the prolonged time span between first and final impacts. In the Ouachita and Marathon provinces, triangular flsych depocenters with north-plunging axes may have been the consequences of transform drag and related clockwise rotation of mobile block segments. The composite Muenster arch part of the Amarillo-Wichita uplift and the Central Basin platform are structurally analogous vertical block uplifts but of different tectonic age. These uplifts and associated Anadarko-Ardmore and Delaware-Val Verde aulacogens in Oklahoma and Texas are impingement-related features on the stable cratonic block. An ancestral basement fabric of the North American craton predestined structural development of features such as the Central Basin platform and composite Muenster arch.

  2. ECOLOGICAL CONDITION OF ESTUARIES IN THE GULF OF MEXICO

    EPA Science Inventory

    The predominantly shallow estuaries in the Gulf of Mexico are ranked highest in the Nation in terms of water surface area, freshwater inflow, and wetlands area. Estuaries are an ecologically and economically valuable resource in the Gulf of Mexico. The U.S. Environmental Protecti...

  3. Satellite imagery tracks currents in Gulf of Mexico

    SciTech Connect

    Huh, O.K. . Coastal Studies Inst.); Schaudt, K.J. )

    1990-05-07

    With the onset of drilling in the Gulf of Mexico at water depths in excess of 300m, detection and location of the boundaries of high speed current zones has become important in preventing downtime in drilling and production operations. This article reports on the use of satellite imagery to track currents in the Gulf of Mexico.

  4. Why is Habitat Restoration Near the Gulf of Mexico Essential?

    EPA Pesticide Factsheets

    Restoration in the Gulf of MexicoWetlands in the coastal watersheds make up about 38 percent of total wetland area in the conterminous United States, and Gulf of Mexico Coastal Wetlands make up 37 percent of such wetlands in the United State

  5. 76 FR 64327 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Gulf of Mexico Reef Fish Fishery...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-10-18

    ... Fish, Shrimp, and Coral and Coral Reefs Fishery Management Plans (Generic ACL Amendment) for purposes..., and South Atlantic; Gulf of Mexico Reef Fish Fishery; South Atlantic Snapper-Grouper Fishery AGENCY... Management Plan for Reef Fish Resources of the Gulf of Mexico (Reef Fish FMP). Subsequently, in a...

  6. Smoke in the Gulf of Mexico

    NASA Technical Reports Server (NTRS)

    2002-01-01

    This Sea-viewing Wide Field-of-view Sensor (SeaWiFS) image of the Bay of Campeche, acquired January 17, 2001, shows a 300-kilometer long smoke plume streaming towards the northwest from around 19.4o North and 92o West, the location of the Akal oil field. In the lower right (southeast) corner of the image is the country of El Salvador, site of a magnitude 7.6 earthquake on January 13, 2001. On the Pacific side of Southern Mexico, the productive waters of the Gulf of Tehuantepec are visible. Provided by the SeaWiFS Project, NASA/Goddard Space Flight Center, and ORBIMAGE

  7. Seagrasses in northern Gulf of Mexico: An ecosystem in trouble

    USGS Publications Warehouse

    ,

    2000-01-01

    The USGS National Wetlands Research Center has documented that Seagrasses in the northern Gulf of Mexico constitute an ecosystem in trouble. From studies in St. Andrews Bay, Period Bay, the Chandeleur Islands, and the Gulf Islands National Seashore, scientists have discovered that declining seagrass acreage ranges from 12% to 66% in bays and estuaries of the Gulf of Mexico. Not only are seagrasses disappearing, but they are also changing in species composition, densities, and patchiness.

  8. Environmental and economic assessment of discharges from Gulf of Mexico region oil and gas operations. Quarterly technical progress report, July--September 1995

    SciTech Connect

    Gettleson, D.A.

    1995-10-31

    Continental Shelf Associates, Inc. (CSA) was contracted to conduct a three-year study of the environmental and health related impacts of produced water and sand discharges from oil and gas operations. Data on naturally occurring radioactive materials (NORM), heavy metals, and hydrocarbons in water, sediment, and biota will be collected and evaluated. Health related impacts will be studied through field collections and analyses of commercially- and recreationally-important fish and shellfish tissues. Additionally, information on seafood catch, consumption, and use patterns for the Gulf of Mexico will be gathered and analyzed. The facilities to be studied will include both offshore and coastal facilities in the Gulf of Mexico. Coastal sites will be additionally studied to determine ecological recovery of impacted wetland and open bay areas. The economic impact of existing and proposed effluent federal and state regulations will also be evaluated. This report represents the thirteenth quarterly technical summary for the study ``Environmental and Economic Assessment of Discharges from Gulf of Mexico Region Oil and Gas Operations.`` Activities associated with Tasks 3 through 8 are discussed in this report.

  9. Planning report for the Gulf Coast Regional Aquifer-System Analysis in the Gulf of Mexico coastal plain, United States

    USGS Publications Warehouse

    Grubb, Hayes F.

    1984-01-01

    Large quantities of water for municipal, industrial and agriculture use are supplied from the aquifers in Tertiary and younger sediments over an area of about 225,000 square miles in the Coastal Plain of Alabama, Arkansas, Florida, Illinois, Kentucky, Louisiana, Mississippi, Missouri, Tennessee, and Texas. Three regional aquifer systems, the Mississippi Embayment aquifer system, the Coastal Lowlands aquifer system, and the Texas Coastal Uplands aquifer system have been developed to varying degrees throughout the area. A variety of problems has resulted from development such as movement of the saline-freshwater interface into parts of aquifers that were previously fresh, lowering of the potentiometric surface with resulting increases in pumping lift, and land-surface subsidence due to the compaction of clays within the aquifer. Increased demand for ground water is anticipated to meet the needs of urban growth, expanded energy development, and growth of irrigated agriculture. The U. S. Geological Survey initiated an eightyear study in 1981 to define the geohydrologic framework, describe the chemistry of the ground water, and to analyze the regional ground-water flow patterns. The objectives, plan, and organization of the study are described in this report and the major tasks to be undertaken are outlined.

  10. MMS; Two more months needed for Gulf of Mexico restoration

    SciTech Connect

    Koen, A.D.

    1992-09-28

    This paper reports that two more months could be needed to restore Gulf of Mexico oil and gas production shut in because of Hurricane Andrew, Minerals Management Service estimates. Hurricane Andrew swept west across South Florida into the gulf, then turned north and struck the Louisiana coast Aug. 25. Operators last week continued filing with MMS district offices in the New Orleans region reports of newly discovered damage to offshore oil and gas structures. By midweek, MMS listed more that 241 platforms, well satellites, and other offshore structures and 135 pipelines damaged by the storm.

  11. 2013 Gulf of Mexico Hypoxia Forecast

    USGS Publications Warehouse

    Scavia, Donald; Evans, Mary Anne; Obenour, Dan

    2013-01-01

    The Gulf of Mexico annual summer hypoxia forecasts are based on average May total nitrogen loads from the Mississippi River basin for that year. The load estimate, recently released by USGS, is 7,316 metric tons per day. Based on that estimate, we predict the area of this summer’s hypoxic zone to be 18,900 square kilometers (95% credible interval, 13,400 to 24,200), the 7th largest reported and about the size of New Jersey. Our forecast hypoxic volume is 74.5 km3 (95% credible interval, 51.5 to 97.0), also the 7th largest on record.

  12. An oilspill risk analysis for the Gulf of Mexico outer continental shelf lease area; regional environmental impact statement

    USGS Publications Warehouse

    LaBelle, R.P.

    1982-01-01

    An oilspill risk analysis was conducted for the Gulf of Mexico Outer Continental Shelf (OCS)lease area region. Results of the analysis can be used to determine relative risks associated with oil production in different regions to be offered in OCS Lease Sales 72, 74, and 79. The analysis considered the probability of spill occurrences based on historical trends; likely movement of oil slicks based on a climatological model; and locations of major environmental resources which could be vulnerable to spilled oil. The times between spill occurrence and contact with resources were estimated to aid in estimating slick characteristics. Critical assumptions made for this particular analysis were (1) that oil exists in the lease area, and (2) that oil will be, found and produced from tracts sold in sales 72, 74, and 79. On the basis of a most likely resource estimate of 241 million barrels of oil to be produced over an 18-year production life from sales to be held in 1983 (sales 72, 74, 79), it was calculated that approximately one oilspill of 1,000 barrels or larger will occur. The estimated probability that one or more oilspills of 1,000 barrels or larger will occur and contact land after being at sea less than 30 days is 41-percent. For a high resource estimate case of sales to be held in 1983, 717 million barrels are estimated to be produced over an 18-year production life with an 83-percent chance of one or more spills of 1,000 barrels or larger occurring and contacting land within 30 days. These results depend upon the routes and methods chosen to transport oil from OCS platforms to shore. Given a total development scenario in which 5.6 billion barrels of oil are estimated to be present and produced, it was calculated that 18 oilspills of 1,000 barrels or larger will occur over the 40-year production life of the proposed lease area. The estimated probability that one or more oilspills of 1,000 barrels or larger will occur and contact land after being at sea less than

  13. 2014 Gulf of Mexico Hypoxia Forecast

    USGS Publications Warehouse

    Scavia, Donald; Evans, Mary Anne; Obenour, Dan

    2014-01-01

    The Gulf of Mexico annual summer hypoxia forecasts are based on average May total nitrogen loads from the Mississippi River basin for that year. The load estimate, recently released by USGS, is 4,761 metric tons per day. Based on that estimate, we predict the area of this summer’s hypoxic zone to be 14,000 square kilometers (95% credible interval, 8,000 to 20,000) – an “average year”. Our forecast hypoxic volume is 50 km3 (95% credible interval, 20 to 77).

  14. 78 FR 61842 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-10-04

    ... 0648-XC912 Gulf of Mexico Fishery Management Council; Public Meeting AGENCY: National Marine Fisheries... Gulf of Mexico Fishery Management Council. SUMMARY: The Gulf of Mexico Fishery Management Council...; telephone: (504) 581-1300. Council address: Gulf of Mexico Fishery Management Council, 2203 North Lois...

  15. Pre-breakup geology of the Gulf of Mexico-Caribbean: Its relation to Triassic and Jurassic rift systems of the region

    SciTech Connect

    Bartok, P. )

    1993-02-01

    A review of the pre-breakup geology of west-central Pangea, comprised of northern South America, Gulf of Mexico and West Africa, combined with a study of the Mesozoic rift trends of the region confirms a relation between the rift systems and the underlying older grain of deformation. The pre-breakup analysis focuses attention on the Precambrian, Early Paleozoic and Late Paleozoic tectonic events affecting the region and assumes a Pindell fit. Two Late Precambrian orogenic belts are observed in the west central Pangea. Along the northern South American margin and Yucatan a paleo northeast trending Pan-African aged fold belt is documented. A second system is observed along West Africa extending from the High Atlas to the Mauritanides and Rockelides. During the Late Paleozoic, renewed orogenic activity, associated with the Gondwana/Laurentia suture, affected large segments of west central Pangea. The general trend of the system is northeast-southwest and essentially parallels the Gyayana Shield, West African, and eastern North American cratons. Mesozoic rifting closely followed either the Precambrian trends or the Late Paleozoic orogenic belt. The Triassic component focuses along the western portions of the Gulf of Mexico continuing into eastern Mexico and western South America. The Jurassic rift trend followed along the separation between Yucatan and northern South America. At Lake Maracaibo the Jurassic rift system eventually overlaps the Triassic rifts. The Jurassic rift resulted in the [open quotes]Hispanic Corridor[close quotes] that permitted Tethyan and Pacific marine faunas to mix at a time when the Gulf of Mexico underwent continental sedimentation.

  16. Map showing geology, oil and gas fields, and geologic provinces of the Gulf of Mexico region

    USGS Publications Warehouse

    French, Christopher D.; Schenk, Christopher J.

    2006-01-01

    This map was created as part of a worldwide series of geologic maps for the U.S. Geological Survey's World Energy Project. These products are available on CD-ROM and the Internet. The goal of the project is to assess the undiscovered, technically recoverable oil and gas resources of the world. Two previously published digital geologic data sets (U.S. and Caribbean) were clipped to the map extent, while the dataset for Mexico was digitized for this project. Original attributes for all data layers were maintained, and in some cases, graphically merged with common symbology for presentation purposes. The world has been divided into geologic provinces that are used for allocation and prioritization of oil and gas assessments. For the World Energy Project, a subset of those provinces is shown on this map. Each province has a set of geologic characteristics that distinguish it from surrounding provinces. These characteristics may include dominant lithologies, the age of the strata, and/or structural type. The World Geographic Coordinate System of 1984 is used for data storage, and the data are presented in a Lambert Conformal Conic Projection on the OFR 97-470-L map product. Other details about the map compilation and data sources are provided in metadata documents in the data section on this CD-ROM. Several software packages were used to create this map including: Environmental Systems Research Institute, Inc. (ESRI) ArcGIS 8.3, ArcInfo software, Adobe Photoshop CS, Illustrator CS, and Acrobat 6.0.

  17. Nutrient Enrichment Drives Gulf of Mexico Hypoxia

    NASA Astrophysics Data System (ADS)

    Boesch, Donald F.; Boynton, Walter R.; Crowder, Larry B.; Diaz, Robert J.; Howarth, Robert W.; Mee, Laurence D.; Nixon, Scott W.; Rabalais, Nancy N.; Rosenberg, Rutger; Sanders, James G.; Scavia, Donald; Turner, R. Eugene

    2009-04-01

    During most summers over the past 30 years, bottom dissolved oxygen across a large area of the Louisiana and upper Texas continental shelf declined to concentrations too low (hypoxia) for most fish and large invertebrate animals to survive. This area is one of the best known “dead zones” proliferating around the world [Diaz and Rosenberg, 2008]. During July 2008, hypoxic bottom waters extended across 20,720 square kilometers (Figure 1), but they were probably even more extensive because winds from Hurricane Dolly mixed the waters off Texas before the survey could be completed. Increased inputs of nutrients (principally nitrogen and phosphorus) from the U.S. agricultural heartland within the Mississippi-Atchafalaya River Basin (MARB) are implicated in the development and spread of hypoxia in the Gulf of Mexico. Consequently, the causes of, and solutions for, hypoxia have been subjects of extensive debate and analysis. An integrated scientific assessment led to a 2001 Action Plan [Mississippi River/Gulf of Mexico Watershed Nutrient Task Force, 2001] with a goal of reducing the area of the hypoxic zone to less than 5000 square kilometers by reducing nitrogen loading [Rabalais et al., 2007].

  18. 77 FR 40561 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-07-10

    ..., Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of Mexico; Amendment 34 AGENCY... Council (Council) has submitted Amendment 34 to the Fishery Management Plan for the Reef Fish Resources of the Gulf of Mexico (FMP) for review, approval, and implementation by NMFS. Amendment 34 proposes...

  19. 76 FR 50181 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-08-12

    ... National Oceanic and Atmospheric Administration RIN 0648-XA505 Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of Mexico; Exempted Fishing Permit AGENCY: National... 50 CFR part 622, as they pertain to reef fish managed by the Gulf of Mexico Fishery...

  20. Sea level rise in Louisiana and Gulf of Mexico

    SciTech Connect

    Ramsey, K.; Penland, S. )

    1989-09-01

    Data from two tide-gage networks in Louisiana and the northern Gulf of Mexico were analyzed to determine local and regional trends in relative sea level rise. The US Army Corps of Engineers (USACE) maintains a network of 83 tide-gage stations throughout coastal Louisiana. Of these, 20 have records for two lunar nodal cycles or more, and some date back to 1933. The authors used the USACE data set to determine the local and regional character of relative sea level rise in Louisiana. The National ocean Survey (NOS) maintains nine tide gage stations throughout the northern Gulf of Mexico in Texas, Louisiana, Mississippi, Alabama, and Florida. All of the records of these stations exceed two lunar nodal cycles, and some date back to 1908. The authors used the NOS data set to determine the character of relative sea level rise throughout the northern Gulf of Mexico. This investigation updates and extends the previous systematic regional tide gage analysis (which covered 1908-1983) to 1988.

  1. Gulf of Mexico Loop Current path variability

    NASA Astrophysics Data System (ADS)

    Donohue, K. A.; Watts, D. R.; Hamilton, P.; Leben, R.; Kennelly, M.; Lugo-Fernández, A.

    2016-12-01

    Loop Current, LC, path variability exhibits a continuum of spatial and temporal scales, all are called meanders in this work. They arise from a variety of processes, including short and long waves, frontal eddies with or without closed cores and developing baroclinic instability. They have been extensively studied with satellite sea surface temperature SST, and height, SSH. Yet, these systems provide an incomplete view into LC meandering: SST measurements are hampered by cloud coverage and low thermal contrast in summer months and SSH measurements by altimeter temporal and spatial resolution. In an effort to resolve LC meander temporal and spatial scales, they are investigated using a mesoscale resolving in situ array deployed in the Gulf of Mexico. The array, which consisted of twenty-five inverted echo sounders with pressure gauges, PIES, and current meter moorings, was deployed April 2009 and recovered in October-November 2011. The broad extent of the array, nominally 89° W to 85° W, 25° N to 27° N, enabled quantitative mapping of the regional circulation. LC meander properties are characterized as a function of spatial distribution of energy, frequency, wavenumber, and phase speed. Dispersion characteristics and meander scales are comparable to those found in the Gulf Stream. Phase speeds increase with frequency and range from 8 to 50 km d-1. Wavelengths associated with each band are as follows: 460 km for the 100 to 40 d band, 350 km for the 40 to 20 d band, 270 km for the 20 to 10 d band and 230 km for the 10 to 3 d band. The strongest variability is in the 100 to 40 d band. Spatially the 100 to 40 d variability is concentrated to east of the Mississippi Fan, growing and propagating downstream along the eastern portion of the LC. Meanders between 40 and 20 d propagate along the full encompassed length of the LC. Their temporal amplitudes peak at the time of LC eddy detachment and separation. Meanders with shorter periods than 20 d do not always propagate

  2. Trace metals in Gulf of Mexico oysters.

    PubMed

    Presley, B J; Taylor, R J; Boothe, P N

    1990-11-01

    Oysters (Crassostrea virginica) from 50 to 69 locations (sites) along the Gulf of Mexico coastline, collected annually in 1986, 1987 and 1988, have been analyzed for 13 trace metals, including most of the metals of concern from an environmental quality perspective. Essentially the entire U.S. Gulf coastline was sampled, from far south Texas to far south Florida. Pooled samples of 20 oysters from three different stations at each site were analyzed by atomic absorption spectrophotometry. The concentrations found were generally less than or equal to literature values from other parts of the world thought to be uncontaminated by anthropogenic trace metal inputs. A few sites did, however, show apparent trace metal pollution and other sites gave anomalous values that cannot readily be explained by either known anthropogenic or natural causes. The range of values for the overall data set (maximum/minimum) varied from 15-fold for Mn to 624-fold for Pb, whereas the coefficient of variation (standard deviation/mean) was generally in the 50-60% range for most metals. Variations were much greater between stations than between years at a given station. Enrichments usually occurred in suites of three to four elements with Ag, Cd, Cu and Zn being the most common suite, thus several strong inter-element correlations were found. There was, however, little correlation between metal levels in oysters and in sediments from the collection sites even when sediment data were rationed to Al (sediment data are not given here). There was likewise little correlation between oyster metal levels and size, sex or reproductive stage of the oysters (data given elsewhere). Geographically, appreciably elevated (greater than 3 times average) metal levels were generally restricted to single sites within bays or estuaries, implying local control. On the other hand, regionally, Ag, Cd and Se levels were somewhat higher in Texas oysters than in those from Florida, whereas the reverse was true for As and

  3. Structure of the Western Gulf of Mexico Salt Canopy Surface Imaged by Regional 2D Multichannel Seismic Data

    NASA Astrophysics Data System (ADS)

    Sager, W. W.; Robla, V.; Emmet, P. A.

    2016-12-01

    The morphology of the continental slope of the northwestern Gulf of Mexico (GoM) shifts going from the smoother offshore Texas (TX) margin to the rugose central Louisiana (LA) offshore. This change is considered a reflection of the structure of mobile Jurassic salt residing within the margin sediment column. To test this hypothesis, the structure of the top of salt across the TX and western LA continental slopes has been imaged and compared to the bathymetry using a regional grid of 2D industry multichannel seismic data. The 2D data, provided by TGS, were analyzed using IHS Kingdom software. Prior studies, regional well data, and satellite gravity data were examined to support and constrain interpretations. Seafloor (SF) and top-of-salt (TOS) time picks from seismic profiles were gridded to make regional time-structure maps of these surfaces. Comparison of SF and TOS contours demonstrates the expected correlation. A closer inspection reveals that the preponderance of SF is coincident with the underlying highs and lows of the TOS and that the study area is characterized by a transition in salt morphology that corresponds to bathymetric expression. The western slope is dominated by large, shallow, circular, isolated salt bodies and the overlying seafloor is smooth with exception of large, circular high relief above nearly all of the interpreted salt structures. The TOS texture gradually changes going eastward where individual salt bodies increase in number and coalesce into large, shallow canopies of increasing rugosity. Again, the outline of the canopies, and many of the crests of the constitute salt bodies, are observable on the SF. Elongate salt structures dominate the north central and northeast study area, while a relatively continuous, highly rugged canopy spans the southern and outer margin of the slope. While some of the northern-most elongate bodies are less correlated with the SF, most are and the undulating relief of the canopy clearly translates to SF

  4. Operational considerations for implementing regional sediment management plans in the northern Gulf of Mexico

    USGS Publications Warehouse

    Underwood, Steven G.; Khalil, Syed M.; Byrnes, Mark R.; Steyer, Gregory D.; Raynie, Richard C

    2015-01-01

    Development of a comprehensive and stakeholder-driven Regional Sediment Management plan can provide the basis for long-term sustainable resource use and protection. This paper highlights three operational components that can positively influence sediment management at a regional scale, including (1) integration of an operational sediment budget, (2) development of a monitoring and adaptive management plan, and (3) development of a regional sediment availability and allocation program. These components seek to incorporate science and adaptive management through implementation of an organized and well-documented decision making process. They represent a coordinated framework that could serve as a guide for unifying financial investments in regional sediment management plans. Collectively, they establish an integrated process for addressing uncertainties about future system change in light of shrinking federal and state budgets, competing demands for sediment resources within riverine and marine waters, and policy considerations related to sediment/water use (e.g., navigation and commerce versus environmental management).

  5. Florida lineament: Key tectonic element of eastern Gulf of Mexico

    SciTech Connect

    Christenson, G. )

    1990-09-01

    The origin of the Florida lineament, a major basement lineament that strikes northwest-southeast across the West Florida Shelf and southern Florida, is a key to the history of the Gulf of Mexico. Regional magnetic and gravity trends are truncated along the Florida lineament. New geologic data from recent wells on the West Florida Shelf and magnetic anomaly data indicate that pre-Mesozoic basement terranes on opposite sides of the Florida lineament were contiguous prior to Triassic-Jurassic volcanism and exhibit only minimal lateral offset across the Florida lineament at present. The lack of major lateral offset of pre-Mesozoic basement terranes across the Florida lineament and lithologic and geophysical data suggest that the lineament represents a Triassic-Jurassic extensional rift margin. The Florida lineament is interpreted to be the southeastward continuation of the well-documented peripheral fault system, which delineates the rifted continental margin of the northern Gulf basin. The continuation of the peripheral fault system along the Florida lineament suggests that the tectonostratigraphic terranes associated with the Mesozoic producing trends of the northern Gulf basin may extend southeastward along the Florida lineament. The interpretation of the Florida lineament as an extensional rift margin places significant constraints on any tectonic model of the Gulf of Mexico region. A tectonic interpretation consistent with the constraints suggests that the West Florida Shelf and southern Florida region formed as the result of Triassic-Jurassic extension around a pole of rotation in central Florida. The central Florida pole of rotation is intermediate to the poles of rotation counterclockwise of Yucatan out of the northern Gulf basin. This suggests that the region south of the Florida lineament underwent extension synchronous with the rotation of the Yucatan block.

  6. Inner shelf deposits of Louisiana-Mississippi-Alabama region, Gulf of Mexico

    SciTech Connect

    Kindinger, J.L. ); Penland, S.; ); Williams, S.J. ); Suter, J.R. )

    1989-09-01

    The late Quaternary morphology, shallow stratigraphy, and sediment distribution of the Louisiana-Mississippi-Alabama inner shelf are the product of a complex set of transgressive and regressive sedimentary processes interacting during the Holocene transgression. Shelf sedimentary facies were deposited by a combination of deltaic progradation followed by shoreface erosion and submergence. This information is based on interpretations and synthesis or more than 3,200 km of high-resolution seismic profiles and 50 vibracores. The shelf can be divided into two main depositional regions. The southwest region, east and south of the Mississippi River plain, was formed by two ancestral river delta complexes, overlying a late Wisconsin delta. Deposits of the late Wisconsinan delta consist of well-defined coarsening-upward sequences and represent deltaic progradation during low sea level. The relatively recent Mississippi delta complexes have deposits consisting of fine-grained sand, silt, and clay. With the late Holocene rise in sea level asymmetrical sand ridges (< 5 m relief) have formed due to marine reworking of this shoreline. The northeastern region offshore the barrier islands in Mississippi-Alabama have been formed by the ravinement of the exposed shelf by Pleistocene fluvial system and shoreface erosion. Sediments, underlying the relatively thin Holocene sediment, cover fluvial sands deposits during the late Wisconsinan lowstand. Subsequent sea level rise allowed marine processes to rework and redistribute sediments forming the nearshore fine-grained facies and shelf sand sheet.

  7. NASA's Contributions to the Gulf of Mexico Alliance

    NASA Technical Reports Server (NTRS)

    Glorioso, Mark

    2008-01-01

    This viewgraph document reviews the contribution that NASA has made and the plans for future missions that will assist the mission of the Gulf of Mexico Alliance (GOMA). Specific reference to the work of the Stennis Space Center is reviewed. Some of the projects are: Coastal Online Assessment and Synthesis Tool (COAST), Regional Sediment Management, Coral Reef Early Warning System, Harmful Algal Bloom, Hypoxia, Land-Use and Land-Cover (LULC) Change from 1974-2008 around Mobile Bay, AL, Satellite Estimation of Suspended Particulate Loads in and around Mobile Bay, AL, Estimating Relative Nutrient Contributions of Agriculture and Forests Using MODIS Time Series, Coastal Marsh Monitoring for Persistent Saltwater Intrusion, Standardized Remote Sensing PRoduct for Water Clarity estimation within Gulf of Mexico Coastal Waters.

  8. Jurassic petroleum trends in eastern Gulf Coastal Plain and central and eastern Gulf of Mexico

    SciTech Connect

    Mancini, E.A.; Mink, R.M.; Bearden, B.L.

    1986-05-01

    Three Jurassic petroleum trends can be delineated in Mississippi, Alabama, and Florida, and in the central and eastern Gulf of Mexico. These trends are recognized by characteristic petroleum traps, reservoirs, and hydrocarbon types. The source for the Jurassic hydrocarbons is Smackover algal mudstones. The Jurassic oil trend includes the area north of the regional peripheral fault systems in the tri-state area, and extends into the area north of the Destin anticline. Traps are basement highs and salt anticlines, with Smackover grainstones and dolostones and Norphlet marine, eolian, and wadi sandstones as reservoirs. This trend has potential for Jurassic oil accumulations in the eastern Gulf of Mexico. The Jurassic oil and gas-condensate trend includes the onshore area between the regional peripheral fault systems and Wiggins arch and extends into the area of the Destin anticline. Traps are basement highs, salt related anticlines, and extensional faults. Cotton Valley fluvial-deltaic sandstones, Haynesville carbonates and fluvial-deltaic sandstones, Smackover grainstones, packstones, dolostones, and marine sandstones, and Norphlet marine, eolian, and wadi sandstones serve as reservoirs. This trend contains most of the Jurassic fields in the eastern Gulf coastal plain. The trend has high potential for significant petroleum accumulations in the eastern Gulf of Mexico. The Jurassic deep natural gas trend includes the onshore area south of the Wiggins arch and extends into the Mississippi-Alabama shelf. Traps are faulted salt anticlines with basement highs as potential traps. Cotton Valley deltaic-strandplain sandstones and Norphlet eolian sandstones are the reservoirs. Several gas discoveries below 20,000 ft have been made in this trend in Mississippi and offshore Alabama. The trend has excellent potential for major gas accumulations in coastal Alabama and central Gulf of Mexico.

  9. Environmental Conditions in the Gulf of Mexico during November-December

    DTIC Science & Technology

    1990-10-01

    The purpose of this technical note is to describe some of the environmental conditions in a region of the Gulf of Mexico in which an experiment will take place in November and December 1990. The general area

  10. Measuring Capacity for Resilience among Coastal Counties of the US Northern Gulf of Mexico Region.

    PubMed

    Reams, Margaret A; Lam, Nina S N; Baker, Ariele

    2012-12-01

    Many have voiced concern about the long-term survival of coastal communities in the face of increasingly intense storms and sea level rise. In this study we select indicators of key theoretical concepts from the social-ecological resilience literature, aggregate those indicators into a resilience-capacity index, and calculate an index score for each of the 52 coastal counties of Louisiana, Texas, Mississippi, Alabama and Florida. Building upon Cutter's Social Vulnerability Index work [1], we use Factor Analysis to combine 43 variables measuring demographics, social capital, economic resources, local government actions, and environmental conditions within the counties. Then, we map the counties' scores to show the spatial distribution of resilience capacities. The counties identified as having the highest resilience capacities include the suburban areas near New Orleans, Louisiana and Tampa, Florida, and the growing beach-tourist communities of Alabama and central Florida. Also, we examine whether those counties more active in oil and gas development and production, part of the region's "energy coast", have greater capacity for resilience than other counties in the region. Correlation analyses between the resilience-capacity index scores and two measures of oil and gas industry activity (total employment and number of business establishments within five industry categories) yielded no statistically significant associations. By aggregating a range of important contextual variables into a single index, the study demonstrates a useful approach for the more systematic examination and comparison of exposure, vulnerability and capacity for resilience among coastal communities.

  11. Seismic Oceanography of the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Dickinson, A.; White, N.; Caulfield, C. C. P.; Falder, M.

    2016-02-01

    Near-surface circulation within the Gulf of Mexico is dominated by the Loop Current and its generation of anticyclonic eddies, which periodically detach and migrate westward. The interaction of these eddies with the continental slope may play a significant role in transporting near-surface shelf waters into the central Gulf. Here, a 180 km long seismic profile acquired by ION Geophysical in July 2002 is analyzed. This profile crosses the Sigsbee Escarpment, starting in water depths of 80 m and culminating in water depths of 3000 m. It traverses a prominent anticyclonic eddy visible on altimetric surveys. The source consisted of a tuned airgun array (volume = 4800 cubic inches, pressure = 2000 psi). Reflections were recorded on a 9 km streamer towed at 9 m depth with 360 hydrophones spaced every 25 m. Shots were fired every 50 m yielding a fold of cover of 90. These data were processed using a standard workflow (e.g. band-pass filtering, direct wave removal, accurate velocity picking, stacking, migration). By changing the length of the streamer during processing, the `imaging time' of a single location can be varied between 3 and 30 minutes. The stacked image compares well with legacy hydrographic measurements. The top kilometer is characterized by bright, undulatory reflectivity associated with Subtropical Undercurrent and Antarctic Intermediate Water layers. At greater depths, the profile is acoustically transparent due to the nearly constant temperature and salinity of deeper Gulf waters. This hydrographic structure suggests that double diffusion may occur. However, thermohaline staircases are not observed, suggesting the presence of turbulent mixing. Diapycnal diffusivity will be calculated using spectral analysis of tracked seismic reflections. Temporal evolution of thermohaline structure will also be investigated.

  12. Simulation of storm surge, wave, and coastal inundation in the Northeastern Gulf of Mexico region during Hurricane Ivan in 2004

    NASA Astrophysics Data System (ADS)

    Sheng, Y. Peter; Zhang, Yanfeng; Paramygin, Vladimir A.

    Hurricane-induced storm surge, waves, and coastal inundation in the northeastern Gulf of Mexico region during Hurricane Ivan in 2004 are simulated using a fine grid coastal surge model CH3D (Curvilinear-grid Hydrodynamics in 3D) coupled to a coastal wave model SWAN, with open boundary conditions provided by a basin-scale surge model ADCIRC (Advanced CIRCulation) and a basin-scale wave model WW3 (WaveWatch-III). The H∗wind, a reanalysis 10-m wind produced by the NOAA/AOML Hurricane Research Division (HRD), and a relatively simple analytical wind model are used, incorporating the effect of land dissipation on hurricane wind. Detailed comparison shows good agreement between the simulated and measured wind, waves, surge, and high water marks. Coastal storm surge along the coast is around 2-3 m, while peak surge on the order of 3.5 m is found near Pensacola, which is slightly to the east of the landfall location on Dauphin Island. Wind waves reach 20 m at the Mobile South station (National Data Buoy Center buoy 42040) on the shelf and 2 m inside the Pensacola/Escambia Bay. Model results show that wave-induced surge (total surge subtracted by the meteorologically-induced surge due to wind and pressure) accounts for 20-30% of the peak surge, while errors of the simulated surge and waves are generally within 10% of measured data. The extent of the simulated inundation region is increased when the effects of waves are included. Surge elevations simulated by the 3D model are generally up to 15% higher than that by the 2D model, and the effects of waves are more pronounced in the 3D results. The 3D model results inside the Pensacola/Escambia Bay show significant vertical variation in the horizontal currents. While the estuary has little impact on the surge elevation along the open coastal water, surge at the head of Escambia Bay is more than 50% higher than that at the open coast with 1.5 h delay.

  13. Measuring Capacity for Resilience among Coastal Counties of the US Northern Gulf of Mexico Region

    PubMed Central

    Reams, Margaret A.; Lam, Nina S. N.; Baker, Ariele

    2016-01-01

    Many have voiced concern about the long-term survival of coastal communities in the face of increasingly intense storms and sea level rise. In this study we select indicators of key theoretical concepts from the social-ecological resilience literature, aggregate those indicators into a resilience-capacity index, and calculate an index score for each of the 52 coastal counties of Louisiana, Texas, Mississippi, Alabama and Florida. Building upon Cutter’s Social Vulnerability Index work [1], we use Factor Analysis to combine 43 variables measuring demographics, social capital, economic resources, local government actions, and environmental conditions within the counties. Then, we map the counties’ scores to show the spatial distribution of resilience capacities. The counties identified as having the highest resilience capacities include the suburban areas near New Orleans, Louisiana and Tampa, Florida, and the growing beach-tourist communities of Alabama and central Florida. Also, we examine whether those counties more active in oil and gas development and production, part of the region’s “energy coast”, have greater capacity for resilience than other counties in the region. Correlation analyses between the resilience-capacity index scores and two measures of oil and gas industry activity (total employment and number of business establishments within five industry categories) yielded no statistically significant associations. By aggregating a range of important contextual variables into a single index, the study demonstrates a useful approach for the more systematic examination and comparison of exposure, vulnerability and capacity for resilience among coastal communities. PMID:27500076

  14. Environmental and economic assessment of discharges from Gulf of Mexico Region oil and gas operations. Quarterly technical progress report, 1 October--31 December 1992

    SciTech Connect

    Gettleson, D.A.

    1993-01-18

    Tasks 3 (Environmental Field Sampling and Analysis of naturally occurring radioactive materials (NORM), Heavy Metals, and Organics) and 4 (Monitoring of the Recovery of Impacted Wetland and Open Bay Produced Water Discharge Sites in Coastal Louisiana and Texas) activities have included the narrowing of the list of potential offshore platforms for study off Louisiana and Texas and a preliminary selection of three coastal sites in Louisiana. After an extensive search effort, it was concluded that no coastal sites are available in Texas. A meeting was held between the contractor, Department of Energy (DOE), and Brookhaven National Laboratory (BNL) personnel to discuss potential sites and sampling designs. A letter was sent to the Scientific Review Committee (SRC) providing a general description of the revised site selection process and sampling designs. Task 5 (Assessment of Economic Impacts of Offshore and Coastal Discharge Requirements on Present and Future Operations in the Gulf of Mexico Region) activities included continued evaluation of data types available for the economic analysis. Historical field basis data were acquired. The identification of permitted discharge points was also initiated. Task 6 (Synthesis of Gulf of Mexico Seafood Consumption and Use Patterns) activities have involved the completion of the literature review. Drafts of the fisherman and wholesaler surveys were prepared. It was determined with DOE and BNL personnel that the retailer survey would be eliminated and a subsistence fisherman survey would be added. Task 7 (Technology Transfer Plan) work has been delayed due to the Tasks 3 and 4 delay and cancellation of the annual US Minerals Management Service (MMS) Gulf of Mexico Region Information Transfer Meeting. Task 8 (Project Management and Deliverables) activities have involved the submission of the necessary reports and routine management.

  15. The Gulf of Mexico research initiative: It takes a village

    NASA Astrophysics Data System (ADS)

    Colwell, Rita R.

    2016-07-01

    The Gulf of Mexico Research Initiative (GoMRI) was established at the time of one of the most significant ecological events in recent memory, the Deepwater Horizon oil spill. Defined by the discharge of over 150 million gallons of crude oil and the introduction of over 1.8 million gallons of chemical dispersants into the Gulf system, the impacts of the Deepwater Horizon disaster reached the Gulf Coast's wetlands and beaches and impacted the surface and deep ocean. The ecological story of the event reveals a strong linkage between the deep sea research community and research priorities in the Gulf of Mexico (coastal processes, human health, etc.). Deep Sea research efforts have revealed critical parts of the story, providing information on transport, fate, and effects of the Deepwater Horizon oil release and subsequent recovery of the Gulf of Mexico ecosystems.

  16. HIGH CYANOBACTERIAL ABUNDANCE IN GULF OF MEXICO ESTUARIES

    EPA Science Inventory

    Aquatic phytoplankton comprise a wide variety of taxa spanning more than 2 orders of magnitude in size, yet studies of estuarine phytoplankton often overlook the picoplankton, particularly chroococcoid cyanobacteria (c.f. Synechocococcus). Three Gulf of Mexico estuaries (Apalachi...

  17. HIGH CYANOBACTERIAL ABUNDANCE IN GULF OF MEXICO ESTUARIES

    EPA Science Inventory

    Aquatic phytoplankton comprise a wide variety of taxa spanning more than 2 orders of magnitude in size, yet studies of estuarine phytoplankton often overlook the picoplankton, particularly chroococcoid cyanobacteria (c.f. Synechocococcus). Three Gulf of Mexico estuaries (Apalachi...

  18. Oil Spill in the Gulf of Mexico

    NASA Image and Video Library

    2017-09-28

    On April 20, 2010, an explosion at an oil well in the Gulf of Mexico resulted in a major oil spill. Since then, emergency response efforts have been underway to contain the growing oil slick before it reaches the southern coast of the United States. Landsat imagery, acquired by the U.S. Geological Survey on May 1 shows the extent of the oil slick. The Landsat data are being used to monitor the extent and movement of the slick. Location: LA, USA Date Taken: May 1 2010 Credit: NASA/GSFC/Landsat NASA Goddard Space Flight Center enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on Twitter Join us on Facebook

  19. Hydrocarbon flux from natural deepwater Gulf of Mexico vents

    NASA Astrophysics Data System (ADS)

    Smith, Andrew J.; Flemings, Peter B.; Fulton, Patrick M.

    2014-06-01

    High salinities and high temperatures at the seafloor record the upward flow of water and hydrocarbons from depth at natural vents in the deepwater Gulf of Mexico. We present a multiphase heat- and solute-transport model, in which water supplied from depth transports heat and salt, and hydrocarbon transports heat. We show that there is a unique water and hydrocarbon flux that simulates the observed salinity and temperature. We estimate the hydrocarbon flux to be 3.2-15×104 t yr and 1.8-8.0×104 t yr from two vents at lease blocks MC852/853 and GB425. These fluxes are 1-4 orders of magnitude greater than previous estimates from individual deepwater vents. If these results are extrapolated to the entire Gulf of Mexico, then we estimate the regional hydrocarbon flux to be at least 100× greater than previous estimates and 14-120% of the hydrocarbon flux from the Macondo oil spill. Large natural seepage may inoculate marine basins such as the Gulf of Mexico from oil spills like the 2010 Deepwater Horizon blowout by sustaining populations of hydrocarbon-degrading bacteria.

  20. Phytoplankton and sediments in Gulf of Mexico

    NASA Technical Reports Server (NTRS)

    2002-01-01

    Affected both by terrestrial factors like agriculture, deforestation, and erosion, and by marine factors like salinity levels, ocean temperature and water pollution, coastal environments are the dynamic interface between land and sea. In this MODIS image from January 15, 2002, the Gulf of Mexico is awash in a mixture of phytoplankton and sediment. Tan-colored sediment is flowing out into the Gulf from the Mississippi River, whose floodplain cuts a pale, wide swath to the right of center in the image, and also from numerous smaller rivers along the Louisiana coast (center). Mixing with the sediment are the multi-colored blue and green swirls that reveal the presence of large populations of marine plants called phytoplankton. Phytoplankton populations bloom and then fade, and these cycles affect fish and mammals-including humans-higher up the food chain. Certain phytoplankton are toxic to both fish and humans, and coastal health departments must monitor ecosystems carefully, often restricting fishing or harvesting of shellfish until the blooms have subsided.

  1. Phytoplankton and sediments in Gulf of Mexico

    NASA Technical Reports Server (NTRS)

    2002-01-01

    Affected both by terrestrial factors like agriculture, deforestation, and erosion, and by marine factors like salinity levels, ocean temperature and water pollution, coastal environments are the dynamic interface between land and sea. In this MODIS image from January 15, 2002, the Gulf of Mexico is awash in a mixture of phytoplankton and sediment. Tan-colored sediment is flowing out into the Gulf from the Mississippi River, whose floodplain cuts a pale, wide swath to the right of center in the image, and also from numerous smaller rivers along the Louisiana coast (center). Mixing with the sediment are the multi-colored blue and green swirls that reveal the presence of large populations of marine plants called phytoplankton. Phytoplankton populations bloom and then fade, and these cycles affect fish and mammals-including humans-higher up the food chain. Certain phytoplankton are toxic to both fish and humans, and coastal health departments must monitor ecosystems carefully, often restricting fishing or harvesting of shellfish until the blooms have subsided.

  2. Sperm whales (Physeter catodon) in the Gulf of Mexico

    USGS Publications Warehouse

    Collum, L.A.; Fritts, T.H.

    1985-01-01

    The distribution of the sperm whale, Physeter catodon, was documented in the Gulf of Mexico during 1979 to 1981 using regular aerial surveys and opportunistic sightings from ships. Most sightings were in the western Gulf of Mexico in deep waters near the edge of the continental shelf. A total of 47 adults and 12 young animals was sighted in groups containing from one to 14 animals.

  3. Temporal variation of summertime denitrification rates in the Texas-Louisiana inner shelf region in the Gulf of Mexico: A modeling approach using the extended OMP analysis

    NASA Astrophysics Data System (ADS)

    Kim, Il-Nam; Min, Dong-Ha

    2013-09-01

    The northern Gulf of Mexico (GOM) is well known for hypoxic water conditions (O2≤2 mg L-1), and is often referred to as the “Dead Zone”. The area of the Dead Zone has increased remarkably during the recent decades due to the increased coastal eutrophication. Under such conditions, denitrification process that removes “available nitrogen” from the system would likely become more active, and it needs to be better quantified to understand the nature of biogeochemical nitrogen cycles in the northern GOM. Despite its significance, few denitrification studies have been conducted for this area. We estimate the temporal variation of denitrification rates of the bottom waters at the northern Gulf of Mexico encompassing the “Dead Zone” during July of the 1985-2007 period (except for 1988-1990). We use historic hydrographic data and the extended Optimum Multi-Parameter analysis. Denitrification rates of the bottom waters in the region have gradually decreased from 1985 to 1997, and then increased to 2007. The water mass mixing composition of bottom waters on the Texas-Louisiana inner shelf has changed since ∼1997. The Texas-Louisiana Coastal Water part has increased and that of the Subtropical Underwater has decreased. This change appears to have influenced the denitrification rates in the study area. We suggest that denitrification rates of bottom waters in the northern Gulf of Mexico are controlled not only by biogeochemical factors (i.e. organic matter supply and remineralization), but also by physical factor (i.e. stratification and relative contributions from different water masses).

  4. 76 FR 64248 - Gulf of Mexico Reef Fish Fishery; Closure of the 2011 Gulf of Mexico Commercial Sector for...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-10-18

    ... economic zone (EEZ) of the Gulf of Mexico (Gulf). These actions are necessary to reduce overfishing of the... to end overfishing and prevent overfishing from occurring. AMs are management controls to prevent...)(15) of the Magnuson-Stevens Act mandates the establishment of ACLs at a level such that...

  5. Environmental and Economic Assessment of Discharges from Gulf of Mexico Region Oil and Gas Operations

    SciTech Connect

    Gettleson, David A

    1999-10-28

    The primary objectives of the project are to increase the base of scientific knowledge concerning (1) the fate and environmental effects of organics, trace metals, and NORM in water, sediment, and biota near several offshore oil and gas facilities; (2) the characteristics of produced water and produced sand discharges as they pertain to organics, trace metals, and NORM variably found in association with the discharges; (3) the recovery of three terminated produced water discharge sites located in wetland and high-energy open bay sites of coastal Louisiana; (4) the economic and energy supply impacts of existing and anticipated federal and state offshore and coastal discharge regulations; and (5) the catch, consumption and human use patterns of seafood species collected from coastal and offshore waters. The products of the effort will be a series of technical reports detailing the study procedures, results, and conclusions which contribute to the transfer of technology to the scientific community, petroleum industry, and state and federal agencies.

  6. Carbon Sequestration in Wetland Soils of the Northern Gulf of Mexico Coastal Region

    EPA Science Inventory

    Coastal wetlands play an important but complex role in the global carbon cycle, contributing to the ecosystem service of greenhouse gas regulation through carbon sequestration. Although coastal wetlands occupy a small percent of the total US land area, their potential for carbon...

  7. Carbon Sequestration in Wetland Soils of the Northern Gulf of Mexico Coastal Region

    EPA Science Inventory

    Coastal wetlands play an important but complex role in the global carbon cycle, contributing to the ecosystem service of greenhouse gas regulation through carbon sequestration. Although coastal wetlands occupy a small percent of the total US land area, their potential for carbon...

  8. LANDSCAPE ECOLOGY ASSESSMENT OF THE TENSAS RIVER BASIN, MISSISSIPPI RIVER DELTA REGION, AND GULF OF MEXICO

    EPA Science Inventory

    A group of landscape ecological indicators were applied to biophysical data masked to the Tensas River Basin. The indicators were use to identify and prioritize sources of nutrients in a
    Mississippi River System sub-basin. Remotely sensed data were used for change detection a...

  9. 76 FR 78245 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Gulf of Mexico Reef Fish Fishery...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-16

    ... for the Gulf Council's Red Drum, Reef Fish, Shrimp, and Coral and Coral Reefs FMPs (Generic ACL..., and South Atlantic; Gulf of Mexico Reef Fish Fishery; South Atlantic Snapper-Grouper Fishery AGENCY... (Secretary) under section 304(f) of the Magnuson-Stevens Fishery Conservation and Management Act...

  10. Metals in Bone Tissue of Antillean Manatees from the Gulf of Mexico and Chetumal Bay, Mexico.

    PubMed

    Romero-Calderón, Ana G; Morales-Vela, Benjamin; Rosíles-Martínez, René; Olivera-Gómez, León D; Delgado-Estrella, Alberto

    2016-01-01

    Concentrations of seven metals (As, Cd, Cr, Cu, Pb, Ni, and Zn) were analyzed in 33 bone tissue samples of Antillean manatees (Trichechus manatus manatus) found dead in lagoons and rivers of Tabasco and Campeche in the Gulf of Mexico and Chetumal Bay in the Caribbean region. The concentrations of Cr, Cu, Pb, and Zn were significantly different between regions, with greater levels found in the Gulf of Mexico group than in the Mexican Caribbean group (p < 0.05). Pb concentrations differed significantly between adults and calves. No differences were observed between sexes. Metal concentrations detected in the manatee bones were higher than most of those reported for bones in other marine mammals around the world. Future studies are necessary to establish whether the metal concentrations represent a risk to the health of the species.

  11. Gulf of Mexico soundscapes as indicators of ecological stressors

    NASA Astrophysics Data System (ADS)

    Sidorovskaia, N.; Li, K.; Tiemann, C.; Ackleh, A. S.; Tang, T.; Risbourg, J. H.

    2016-12-01

    Soundscapes in the Northern Gulf of Mexico are complex and represent a combination of anthropogenic noise (oil exploration and production, shipping, rig construction, etc.), bio-soundscapes (sound of marine mammals and fish), and geo-soundscapes (weather events, submarine landslides, distant earthquakes, natural gas seeps). We will discuss how Passive Acoustic Monitoring in the deep Gulf has been utilized during the past decade to study the soundscape variability on daily, monthly, and yearly timescales and what environmental information can be extracted from this variability. Isolation of bio-soundscapes, identification of their sources, and abundance estimates based on acoustic cues are used to track the recovery of marine mammal species after major ecological disasters, such as the recent 2010 oil spill. Association of acoustic activity of marine species with anthropogenic noise levels and other environmental variables can provide base data that can be used to build ecological models of habitat preferences for different marine species. Understanding how the variability of anthropogenic soundscapes correlates with marine species distributions is critically important for regional conservation and mitigation strategies. Such studies can also assist in forecasting the long-term ecosystem health status and ecosystem response to disturbances of different spatial and temporal extent, including slow variations associated with climate change. [This research was made possible in part by a grant from The Gulf of Mexico Research Initiative, and in part by funding provided by ONR and The Joint Industry Programme.

  12. 76 FR 35409 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Shrimp Fisheries of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-06-17

    ... National Oceanic and Atmospheric Administration RIN 0648-XA457 Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Shrimp Fisheries of the Gulf of Mexico and Southern Atlantic States AGENCY...: NMFS announces the receipt of an application for an exempted fishing permit (EFP) from the Gulf...

  13. 75 FR 58334 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-24

    ... Gulf of Mexico Recreational Red Snapper Season AGENCY: National Marine Fisheries Service (NMFS.... SUMMARY: NMFS re-opens the recreational red snapper component of the reef fish fishery in the exclusive economic zone (EEZ) of the Gulf of Mexico (Gulf). NMFS previously determined the recreational red...

  14. Environmental and economic assessment of discharges from Gulf of Mexico region oil and gas operations. Quarterly technical progress report, April 1995--June 1995

    SciTech Connect

    Gettleson, D.A.

    1995-07-31

    Progress is described on the determination of environmental impacts from waste discharges to the aquatic ecosystems from oil and gas operations. Task 2 (Preparation of the Sampling and Analysis Plan) activities involved revisions and additions to the Sampling and Analysis Plan. Task 3 (Environmental Field Sampling and Analysis of NORM, Heavy Metals, and Organics) work included analyses of water, sediment, and tissue samples as well as data management. Task 4 (Monitoring of the Recovery of Impacted Wetland and Open Bay Produced Water Discharge Sites in Coastal Louisiana and Texas) activities involved the continued analyses of samples and conducting field sampling at Bay de Chene. Task 5 (Assessment of Economic Impacts of Offshore and Coastal Discharge Requirements on Present and Future Operations in the Gulf of Mexico Region) activities included preparing a draft final report and review by the Scientific Review Committee (SRC). Task 6 (Synthesis of Gulf of Mexico Seafood Consumption and Use Patterns) work involved the preparation of the draft final report and review by the SRC. Task 7 (Technology Transfer Plan) activities involved the presentation of four papers. Task 8 (Project Management and Deliverables) activities involved the submission of the necessary reports and routine management.

  15. Environmental and economic assessment of discharges from Gulf of Mexico region oil and gas operations. Quarterly technical progress report, 1 January--31 March 1993

    SciTech Connect

    Gettleson, D.A.

    1993-04-22

    Task 3 (Environmental Field Sampling and Analysis of NORM, Heavy Metals, and Organics) activities included the continuation of the platform selection process. A revised sampling plan and a projected cost estimate were prepared for Task 3. A letter detailing the revised plan was sent to the Scientific Review Committee (SRC). Task 4 (Monitoring of the Recovery of Impacted Wetland and Open Bay Produced Water Discharge Sites in Coastal Louisiana and Texas) activities involved receiving the final approval for sampling two facilities and requesting approval for a third alternative facility. A revised Task 4 sampling plan and projected estimated costs were prepared. The sampling plan was presented to the SRC for comment. Mobilization activities for the first quarterly sampling were initiated. Task 5 (Assessment of Economic Impactsof Offshore and Coastal Discharge Requirements on Present and Future Operations in the Gulf of Mexico Region) activities included refining the model for estimating the impact of increased environmental compliance costs on remaining reserves in coastal and offshore fields. Task 6 (Synthesis of Gulf of Mexico Seafood Consumption and Use Patterns) activities involved completion and field testing of most survey forms. Retail surveys were initiated and contacts were made with the Vietnamese community. Task 7 (Technology Transfer Plan) work has included scheduling the presentation of information concerning this project at the DOE Contractor Review Meeting in July in Oklahoma. Task 8 (Project Management and Deliverables) activities have involved the submission of the necessary reports and routine management.

  16. 78 FR 14983 - Fisheries of the Gulf of Mexico; Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-03-08

    ... Management Council Spanish Mackerel and Cobia Stock Assessment Review Workshop. SUMMARY: Independent peer review of Gulf of Mexico Spanish Mackerel and Cobia stocks will be accomplished through written reviews... Mexico Spanish Mackerel and Cobia will be held on March 25-26, 2013, from 8 a.m. to 5 p.m. on both days...

  17. Mean Sea Surface and Variability of the Gulf of Mexico Using Geosat Altimetry Data

    DTIC Science & Technology

    1990-03-15

    Geosat Exact Repeat Mission (ERM) altimetric measurements of the sea surface height in the Gulf of Mexico are used to determine the mean sea surface... Gulf of Mexico . Keywords: Altimetry; Mesoscale oceanography; Ocean forecasting; Reprints.

  18. A Climatology of Monthly Mean Sea Surface Temperatures for the Gulf of Mexico,

    DTIC Science & Technology

    1978-01-01

    This report presents monthly mean sea surface temperatures for the Gulf of Mexico in one degree quadrangles. It also includes a short discussion of the temperature data and the ocean currents in the Gulf of Mexico .

  19. 78 FR 66900 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Amendment 28 to the Fishery...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-11-07

    ...NMFS, Southeast Region, in collaboration with the Gulf of Mexico Fishery Management Council (Council) intends to prepare a DEIS to describe and analyze management alternatives to be included in Amendment 28 to the Fishery Management Plan (FMP) for the Reef Fish Resources of the Gulf of Mexico (Amendment 28). These alternatives will consider measures to reallocate red snapper resources between......

  20. Impaired gamete production and viability in Atlantic croaker collected throughout the 20,000 km(2) hypoxic region in the northern Gulf of Mexico.

    PubMed

    Thomas, Peter; Rahman, Md Saydur; Picha, Matthew E; Tan, Wenxian

    2015-12-15

    The long-term impacts of recent marked increases in the incidence and extent of hypoxia (dissolved oxygen <2 mg/L) in coastal regions worldwide on fisheries and ecosystems are unknown. Reproductive impairment was investigated in Atlantic croaker collected in 2010 from the extensive coastal hypoxic region in the northern Gulf of Mexico. Potential fecundity was significantly lower in croaker collected throughout the ~20,000 km(2) hypoxic region than in croaker from normoxic sites. In vitro bioassays of gamete viability showed reductions in oocyte maturation and sperm motility in croaker collected from the hypoxic sites in response to reproductive hormones which were accompanied by decreases in gonadal levels of membrane progestin receptor alpha, the receptor regulating these processes. The finding that environmental hypoxia exposure reduces oocyte viability in addition to decreasing oocyte production in croaker suggests that fecundity estimates need to be adjusted to account for the decrease in oocyte maturation. Copyright © 2015 Elsevier Ltd. All rights reserved.

  1. Influence of outflow from the Gulf of Mexico region on NMHC composition of the free and upper troposphere over Europe and the North Atlantic

    NASA Astrophysics Data System (ADS)

    Baker, A. K.; Schuck, T. J.; Rauthe-Schöch, A.; Brenninkmeijer, C. A.

    2012-12-01

    The CARIBIC project (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container; www.caribic-atmospheric.com) involves the deployment of an instrument container equipped to make atmospheric measurements from aboard a passenger jet, and has operated since 2005 from aboard a Lufthansa Airbus 340-600. Measurements from the container include in-situ trace gas and aerosol analyses and the collection of aerosol and whole air samples for post-flight laboratory analysis. A suite of 20 non-methane hydrocarbons (NMHCs) are measured from the whole air samples, along with greenhouse gas and halocarbon measurements. As all flights originate in and return to Frankfurt, Germany, the free and upper troposphere (FT/UT) over Europe and the North Atlantic are probed on nearly every flight, and the composition was found to be strongly influenced by air masses from the Gulf of Mexico region. Over 75% of air samples collected during flight had backwards trajectories which passed over the region, and nearly half of these had passed through the lower troposphere and boundary layer, affording CARIBIC a "bird's-eye view" of emissions from the Gulf region. Measurements of NMHCs, and also methane, show distinct fossil fuel extraction signatures for Gulf region outflow, namely relatively large enhancements in C2-C4 alkanes coupled with unique ratios between species. Here we discuss the impact of these emissions and their subsequent chemical transformations on FT/UT composition. We also investigate the possible influence of these emissions on the increase in C2-C4 alkanes observed in the FT/UT by CARIBIC over the last 7 years.

  2. ASTER Views the Gulf of Mexico Oil Spill in Infrared May 1

    NASA Image and Video Library

    2010-05-04

    NASA Terra spacecraft captured this image of the growing oil spill in the Gulf of Mexico on May 1, 2010. On April 20, 2010, an explosion destroyed the Deepwater Horizon oil platform operating offshore in the Gulf of Mexico.

  3. 78 FR 27422 - Environmental Documents Prepared for Oil, Gas, and Mineral Operations by the Gulf of Mexico Outer...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-10

    ... Bureau of Ocean Energy Management MMAA104000 Environmental Documents Prepared for Oil, Gas, and Mineral... Mineral Proposals by the Gulf of Mexico OCS Region. SUMMARY: BOEM, in accordance with Federal Regulations..., and mineral-related activities that were proposed in the Gulf of Mexico, and are more...

  4. Gulf of Mexico Oceanography Atlas available

    NASA Astrophysics Data System (ADS)

    The second full-color volume of the Atlas Oceanogáfico del Golfo de México has recently been published by the Grupo de Estudios Oceanográficos of the Instituto de Investigaciones Eléctricas of México (GEO-IIE) (see Eos, Feb. 20, 1990, for announcement of volume 1). This second of an eight-volume series describes the hydrography, baroclinic flows and transports, water masses distributions, and the kinematic properties of anticyclonic-cyclonic ring pairs (modons) of the central and western Gulf of Mexico (26°-20°40‧N, 97°40‧-93°W). The data presented and analyzed in this volume were collected during the Argos 86-1 oceanographic cruise conducted by the GEO-IIE aboard the R/V Justo Sierra during October and November 1986. Authors of the volume are Víctor M. V. Vidal, Francisco V. Vidal, and Abel Hernández. It has 16 chapters in 715 pages, including 248 full-page color plates and 35 tables.

  5. Tectonic evolution of the Gulf of Mexico and Caribbean

    SciTech Connect

    Pindell, J.L.; Barrett, S.F.; Dewey, J.F.

    1985-01-01

    The authors propose a three-phase geologic-kinematic model for the evolution of the Gulf of Mexico/Caribbean region starting with a detailed Late Paleozoic (Alleghenian) plate reconstruction and using a revised relative-motion history for North America (NOAM) and South American (SOAM). The completely closed initial reconstruction incorporates the effects of Jurassic syn-rift crustal extension, an improved Equatorial Atlantic fit, and the post-rift accretion and deformation in northwestern South America. The Yucatan block and western Bahamas continental basement occupied the area of the present Gulf of Mexico. The three phases of evolution are: MIDDLE JURASSIC-CHAMPANIAN; SOAM migrated east-southeast from NOAM, and the Yucatan block rotated 43/sup 0/CCW about a pole in northern Florida reaching its present position by the Berriasian. Carbonate shelves formed along the rifted margins of the Gulf of Mexico and proto-Caribbean. Early Cretaceous crust of the Caribbean Plate (CARIB) formed in the Pacific Basin and was intruded by medial Cretaceous basalts (B'') somewhere to the west of South America. CARIB partially collided with southern Yucatan and northwest SOAM in the Late Cretaceous, and with the Bahamas in the late Paleocene-Middle Eocene. POST-MIDDLE EOCENE: Minor west-northwest NOAM-SOAM convergence occurred along preexisting Atlantic fracture zones. CARIB has migrated eastward by 1200 km, subducting proto-Caribbean crust and forming the Lesser Antilles arc. The original Greater Antilles-Aves Ridge arc has been dissected by anastomosing transforms connecting the Middle American and Lesser Antilles trenches.

  6. Gulf of Mexico numerical model. Project summary

    SciTech Connect

    Blumberg, A. F.; Mellor, G. L.; Herring, H. J.

    1981-02-01

    An efficient three-dimensional, time dependent prognostic model of the Gulf of Mexico has been developed. The model is driven by winds and surface heat flux derived from climatological, atmospheric surface data, the result of an intensive data analysis study. Mean velocity, temperature, salinity, turbulence kinetic energy and turbulence macroscale are the prognostic variables. Lateral boundary conditions for temperature and salinity and geostrophically derived velocity at the Straits of Yucatan and Florida are obtained from climatological ocean data. An analytical second moment turbulence closure scheme embedded within the model provides realistic surface mixed layer dynamics. Free surface elevation distributions are calculated with an algorithm which calculates the external (tidal) mode separately from the internal mode. The external mode, an essentially two-dimensional calculation, requires a short integrating timestep whereas the more costly, three-dimensional, internal mode can be executed with a long step. The result is a fully three-dimensional code which includes a free surface at no sacrifice in computer cost compared to rigid lid models.

  7. Evaluation and Application of the Wave Information Study for the Gulf of Mexico

    DTIC Science & Technology

    1991-12-01

    The Wave Information Study (WIS) for the Gulf of Mexico (WIS Report 18) provides a wave climate for the U.S. shorelines of the Gulf of Mexico based...conditions. In 1991 CERC conducted a one-year hindcast of the Gulf of Mexico for the year 1988 and evaluated the model results against extensive wind and wave

  8. 77 FR 66818 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Assessment...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-11-07

    ... Data, Assessment, and Review (SEDAR); Assessment Process Webinar for Gulf of Mexico Spanish Mackerel... Administration (NOAA), Commerce. ACTION: Notice of SEDAR 28 Gulf of Mexico Spanish mackerel and cobia assessment webinar. SUMMARY: The SEDAR 28 assessment of the Gulf of Mexico Spanish mackerel and cobia fisheries...

  9. Proposed Gulf of Mexico Intensive Study on Carbon Fluxes

    NASA Astrophysics Data System (ADS)

    Coble, P. G.; Robbins, L.; Lohrenz, S.; Cai, W.

    2009-05-01

    The Gulf of Mexico is an ideal site for the study of land-ocean carbon cycle coupling processes. A recent synthesis suggests that Gulf of Mexico air-sea CO2 flux may dominate the net flux of the entire North American margin because of the Gulf's large size and strong carbon signals. Northern Gulf waters appear to be a strong local CO2 sink due to high primary productivity stimulated by river input of anthropogenic nutrients from the North American continent. Nutrient discharge from the Mississippi River has been implicated in widespread hypoxia on the shelf. The surface drainage system of the Gulf covers more than 60% of the U.S. and more than 40% of Mexico; thus, large-scale changes in land-use and water-management practices in both countries, as well as changes in temperature and rainfall due to climate change, will profoundly affect Gulf carbon fluxes. Nevertheless, major sources of uncertainty in the North American carbon budget remain because of largely unsampled areas, undocumented key fluxes, such as air-sea exchange of carbon dioxide, associated carbon fluxes, and poorly characterized control mechanisms. An intensive study in which the Gulf is considered as a whole system, including watersheds, margins, open Gulf of Mexico, overlying atmosphere, and underlying sediments, will be discussed. The study is best addressed using a three-pronged approach that incorporates remote sensing observations, field observations and experiments, and physical and biogeochemical modeling. Societal issues related to carbon management and land-use/land-change must be an integral part of such a study. International cooperation with Mexico, Canada, and Cuba will be essential for the success of this study.

  10. Gulf of Mexico and Atlantic coast sea level change

    NASA Astrophysics Data System (ADS)

    Douglas, Bruce C.

    Twentieth-century relative sea level rise shows considerable variability along the U.S. East and Gulf coasts. Local rates of rise lie in the range of about 1.5 to more than 4 mm per year for records from Key West, Florida, to New York City. Rates of sea level rise in the Gulf of Mexico can be much higher. In Texas and Louisiana, long-term water levels are rising up to about 10 mm per year. This is having disastrous consequences in the form of wetlands loss in the region, estimated to be as much as 65 km2 per year in the Mississippi Delta area of Louisiana alone. Beach erosion is also significant along both the Gulf and Atlantic coasts, resulting in ever-increasing exposure of fixed structures to the damaging impacts of storms. The especially high rates of sea level rise in Louisiana and Texas are a result of their particular geomorphology, and anthropogenic alterations in the form of sediment diversion and withdrawal of underground fluids. The average long-term local rate of sea level rise on the rest of the U.S. East and Gulf coasts when corrected for glacial isostatic adjustment is about 2 mm per year, in conformity with 20th century global sea level rise. U.S. East and Gulf coast tide gauge records also have regionally coherent low frequency (decadal and longer) variations that need to be understood because of their impact on wetlands loss, and to enable accurate determination of long-term trends of sea level rise.

  11. 47 CFR 22.950 - Provision of service in the Gulf of Mexico Service Area (GMSA)

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... for GMEZ licensees, no requirement to file system information update maps pursuant to § 22.947, and no... geographical area within the Gulf of Mexico Service Area that lies between the coastline line and the southern... Zone. (2) Gulf of Mexico Coastal Zone. The geographical area within the Gulf of Mexico Service Area...

  12. 47 CFR 22.950 - Provision of service in the Gulf of Mexico Service Area (GMSA)

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... for GMEZ licensees, no requirement to file system information update maps pursuant to § 22.947, and no... geographical area within the Gulf of Mexico Service Area that lies between the coastline line and the southern... Zone. (2) Gulf of Mexico Coastal Zone. The geographical area within the Gulf of Mexico Service Area...

  13. 47 CFR 22.950 - Provision of service in the Gulf of Mexico Service Area (GMSA)

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... for GMEZ licensees, no requirement to file system information update maps pursuant to § 22.947, and no... geographical area within the Gulf of Mexico Service Area that lies between the coastline line and the southern... Zone. (2) Gulf of Mexico Coastal Zone. The geographical area within the Gulf of Mexico Service Area...

  14. 47 CFR 22.950 - Provision of service in the Gulf of Mexico Service Area (GMSA)

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... for GMEZ licensees, no requirement to file system information update maps pursuant to § 22.947, and no... geographical area within the Gulf of Mexico Service Area that lies between the coastline line and the southern... Zone. (2) Gulf of Mexico Coastal Zone. The geographical area within the Gulf of Mexico Service Area...

  15. 47 CFR 22.950 - Provision of service in the Gulf of Mexico Service Area (GMSA)

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... for GMEZ licensees, no requirement to file system information update maps pursuant to § 22.947, and no... geographical area within the Gulf of Mexico Service Area that lies between the coastline line and the southern... Zone. (2) Gulf of Mexico Coastal Zone. The geographical area within the Gulf of Mexico Service Area...

  16. 78 FR 62587 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-10-22

    ... National Oceanic and Atmospheric Administration Gulf of Mexico Fishery Management Council; Public Meeting...), Commerce. ACTION: Notice of a public meeting of the Gulf of Mexico Fishery Management Council. SUMMARY: The Gulf of Mexico Fishery Management Council (Council) will hold a meeting of the Ad Hoc Red Snapper...

  17. 76 FR 13130 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-10

    ... National Oceanic and Atmospheric Administration RIN 0648-XA281 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of a public meeting. SUMMARY: The Gulf of Mexico Fishery... Tuesday, March 29, 2011. ADDRESSES: The meeting will be held at the Gulf of Mexico Fishery Management...

  18. 75 FR 29724 - Gulf of Mexico Fishery Management Council; Public Meetings

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-27

    ... National Oceanic and Atmospheric Administration RIN 0648-XW68 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of public meetings. SUMMARY: The Gulf of Mexico Fishery.... Council address: Gulf of Mexico Fishery Management Council, 2203 North Lois Avenue, Suite 1100, Tampa, FL...

  19. 78 FR 59656 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-09-27

    ... National Oceanic and Atmospheric Administration RIN 0648-XC892 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of a public meeting. SUMMARY: The Gulf of Mexico Fishery...; telephone: (956) 761-6511. Council address: Gulf of Mexico Fishery Management Council, 2203 North Lois...

  20. 78 FR 77105 - Gulf of Mexico Fishery Management Council (Council); Public Meetings

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-12-20

    ... National Oceanic and Atmospheric Administration RIN 0648-XD037 Gulf of Mexico Fishery Management Council... Atmospheric Administration (NOAA), Commerce. ACTION: Notice of public meetings. SUMMARY: The Gulf of Mexico..., 2014 at nine locations throughout the Gulf of Mexico. The Council will also host a webinar Monday...

  1. 78 FR 14980 - Gulf of Mexico Fishery Management Council; Public Meetings

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-03-08

    ... National Oceanic and Atmospheric Administration RIN 0648-XC540 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of public meetings. SUMMARY: The Gulf of Mexico Fishery... throughout the Gulf of Mexico. The scoping meetings will begin at 6 p.m. and will conclude no later than 9 p...

  2. 75 FR 69921 - Gulf of Mexico Fishery Management Council; Public Meetings

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-11-16

    ... National Oceanic and Atmospheric Administration RIN 0648-XA027 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of public meetings. SUMMARY: The Gulf of Mexico Fishery... Blvd., Webster, TX 77598; telephone: (281) 332-7952. Council Address: Gulf of Mexico Fishery Management...

  3. 77 FR 39998 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-07-06

    ... National Oceanic and Atmospheric Administration Gulf of Mexico Fishery Management Council; Public Meeting...), Commerce. ACTION: Notice of a public meeting. SUMMARY: The Gulf of Mexico Fishery Management Council...; telephone: (985) 787-2163. Council address: Gulf of Mexico Fishery Management Council, 2203 North Lois...

  4. 76 FR 19750 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-08

    ... National Oceanic and Atmospheric Administration RIN 0648-XA357 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of a public meeting. SUMMARY: The Gulf of Mexico Fishery... Gulf of Mexico Fishery Management Council, 2203 North Lois Avenue, Suite 1100, Tampa, FL...

  5. 78 FR 12294 - Gulf of Mexico Fishery Management Council (Council); Public Meetings

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-02-22

    ... National Oceanic and Atmospheric Administration RIN 0648-XC516 Gulf of Mexico Fishery Management Council... Atmospheric Administration (NOAA), Commerce. ACTION: Notice of public meetings. SUMMARY: The Gulf of Mexico..., March 12, 2013. ADDRESSES: The meeting will be held at the Gulf of Mexico Fishery Management Council...

  6. 77 FR 25144 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-04-27

    ... National Oceanic and Atmospheric Administration Gulf of Mexico Fishery Management Council; Public Meeting...), Commerce. ACTION: Notice of a public meeting. SUMMARY: The Gulf of Mexico Fishery Management Council... meeting will be held at the Gulf of Mexico Fishery Management Council, 2203 N. Lois Avenue, Suite 1100...

  7. 75 FR 43147 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-23

    ... National Oceanic and Atmospheric Administration RIN 0648-XX75 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of a public meeting. SUMMARY: The Gulf of Mexico Fishery... will be held at the Gulf of Mexico Fishery Management Council, 2203 North Lois Avenue, Suite 1100...

  8. 75 FR 79341 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-12-20

    ... National Oceanic and Atmospheric Administration RIN 0648-XA095 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce ACTION: Notice of a public meeting. SUMMARY: The Gulf of Mexico Fishery... address: Gulf of Mexico Fishery Management Council, 2203 North Lois Avenue, Suite 1100, Tampa, FL 33607...

  9. 50 CFR 600.1310 - New England and Gulf of Mexico Individual Fishing Quota Referenda.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 50 Wildlife and Fisheries 10 2011-10-01 2011-10-01 false New England and Gulf of Mexico Individual... PROVISIONS Limited Access Privilege Programs § 600.1310 New England and Gulf of Mexico Individual Fishing... Fishery Management Council (NEFMC) and the Gulf of Mexico Fishery Management Council (GMFMC)....

  10. 50 CFR 600.1310 - New England and Gulf of Mexico Individual Fishing Quota Referenda.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 50 Wildlife and Fisheries 12 2014-10-01 2014-10-01 false New England and Gulf of Mexico Individual... PROVISIONS Limited Access Privilege Programs § 600.1310 New England and Gulf of Mexico Individual Fishing... Fishery Management Council (NEFMC) and the Gulf of Mexico Fishery Management Council (GMFMC)....

  11. 77 FR 26745 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-05-07

    ... National Oceanic and Atmospheric Administration Gulf of Mexico Fishery Management Council; Public Meeting...), Commerce. ACTION: Council to convene public meetings. SUMMARY: The Gulf of Mexico Fishery Management..., Eastern time. ADDRESSES: The webinar will be accessible via Internet. Please go to the Gulf of Mexico...

  12. 50 CFR 600.1310 - New England and Gulf of Mexico Individual Fishing Quota Referenda.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 50 Wildlife and Fisheries 8 2010-10-01 2010-10-01 false New England and Gulf of Mexico Individual... PROVISIONS Limited Access Privilege Programs § 600.1310 New England and Gulf of Mexico Individual Fishing... Fishery Management Council (NEFMC) and the Gulf of Mexico Fishery Management Council (GMFMC). These...

  13. 77 FR 29594 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-05-18

    ...-XC028 Gulf of Mexico Fishery Management Council; Public Meeting AGENCY: National Marine Fisheries... public meeting. SUMMARY: The Gulf of Mexico Fishery Management Council (Council) will convene a meeting... 8, 2012. ADDRESSES: The meeting will be held at the Gulf of Mexico Fishery Management Council, 2203...

  14. 77 FR 41376 - Gulf of Mexico Fishery Management Council; Public Meetings

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-07-13

    ... National Oceanic and Atmospheric Administration Gulf of Mexico Fishery Management Council; Public Meetings...), Commerce. ACTION: Council to convene public meetings. SUMMARY: The Gulf of Mexico Fishery Management... Gulf of Mexico Fishery Management Council's Web site at www.gulfcouncil.org for instructions. Council...

  15. 78 FR 25255 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-04-30

    ... National Oceanic and Atmospheric Administration RIN 0648-XC649 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Council to convene public meeting. SUMMARY: The Gulf of Mexico Fishery... meeting will be held at the Gulf of Mexico Fishery Management Council, 2203 N. Lois Avenue, Suite 1100...

  16. 78 FR 63966 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-10-25

    ... National Oceanic and Atmospheric Administration RIN 0648-XC930 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice; public meeting. SUMMARY: The Gulf of Mexico Fishery Management... meeting will be held at the Gulf of Mexico Fishery Management Council, 2203 North Lois Avenue, Suite 1100...

  17. 77 FR 76472 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-12-28

    ... 0648-XC417 Gulf of Mexico Fishery Management Council; Public Meeting AGENCY: National Marine Fisheries... convene public meeting. SUMMARY: The Gulf of Mexico Fishery Management Council will convene scoping... 14, 2013 through January 22, 2013 at seven locations throughout the Gulf of Mexico. The...

  18. 75 FR 81585 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-12-28

    ... National Oceanic and Atmospheric Administration RIN 0648-XA114 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Council to convene public meeting. SUMMARY: The Gulf of Mexico Fishery.... ADDRESSES: The meeting will be held at the Gulf of Mexico Fishery Management Council, 2203 North Lois Avenue...

  19. 76 FR 37063 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-06-24

    ... National Oceanic and Atmospheric Administration RIN 0648-XA514 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Council to convene a public meeting. SUMMARY: The Gulf of Mexico Fishery...., Wednesday, July 13, 2011. ADDRESSES: The meeting will be held at the Gulf of Mexico Fishery Management...

  20. 77 FR 42698 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-07-20

    ... National Oceanic and Atmospheric Administration RIN 0648-XC114 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Council to convene public meeting. SUMMARY: The Gulf of Mexico Fishery...: The meeting will be held at the Gulf of Mexico Fishery Management Council, 2203 North Lois...

  1. Perspective on eastern migration studies: stopover ecology of migratory landbirds in the Gulf Coast region

    USGS Publications Warehouse

    Barrow, W.C.; Johnson Randall, L.A.

    2004-01-01

    Millions of Nearctic-Neotropical landbirds move through the coastal habitats of the Gulf of Mexico each spring and autumn as they migrate across and around the Gulf. Migration routes in the Gulf region are not static and they shift year to year and season to season according to prevailing wind patterns. Using data from field and radar studies, we mapped patterns of migration movement and landfall in the Gulf of Mexico region. Map categories include coastal areas where migrant numbers are consistently high, consistently common, sporadically common-abundant, sporadically common, or sparse. Weather surveillance radar data indicates that habitats along the Northwest Gulf Coast are consistently used each year.

  2. Global climate change impacts on coastal ecosystems in the Gulf of Mexico: considerations for integrated coastal management

    USGS Publications Warehouse

    Day, John W.; Yáñez-Arancibia, Alejandro; Cowan, James H.; Day, Richard H.; Twilley, Robert R.; Rybczyk, John R.

    2013-01-01

    Global climate change is important in considerations of integrated coastal management in the Gulf of Mexico. This is true for a number of reasons. Climate in the Gulf spans the range from tropical to the lower part of the temperate zone. Thus, as climate warms, the tropical temperate interface, which is currently mostly offshore in the Gulf of Mexico, will increasingly move over the coastal zone of the northern and eastern parts of the Gulf. Currently, this interface is located in South Florida and around the US-Mexico border in the Texas-Tamaulipas region. Maintaining healthy coastal ecosystems is important because they will be more resistant to climate change.

  3. Dispersion of a tracer in the deep Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Ledwell, James R.; He, Ruoying; Xue, Zuo; DiMarco, Steven F.; Spencer, Laura J.; Chapman, Piers

    2016-02-01

    A 25 km streak of CF3SF5 was released on an isopycnal surface approximately 1100 m deep, and 150 m above the bottom, along the continental slope of the northern Gulf of Mexico, to study stirring and mixing of a passive tracer. The location and depth of the release were near those of the deep hydrocarbon plume resulting from the 2010 Deepwater Horizon oil well rupture. The tracer was sampled between 5 and 12 days after release, and again 4 and 12 months after release. The tracer moved along the slope at first but gradually moved into the interior of the Gulf. Diapycnal spreading of the patch during the first 4 months was much faster than it was between 4 and 12 months, indicating that mixing was greatly enhanced over the slope. The rate of lateral homogenization of the tracer was much greater than observed in similar experiments in the open ocean, again possibly enhanced near the slope. Maximum concentrations found in the surveys had fallen by factors of 104, 107, and 108, at 1 week, 4 months, and 12 months, respectively, compared with those estimated for the initial tracer streak. A regional ocean model was used to simulate the tracer field and help interpret its dispersion and temporal evolution. Model-data comparisons show that the model simulation was able to replicate statistics of the observed tracer distribution that would be important in assessing the impact of oil releases in the middepth Gulf.

  4. Consequences of Chixculub Impact for the Tectonic and Geodynamic Evolution of the Gulf of Mexico North Carribean Region

    NASA Astrophysics Data System (ADS)

    Rangin, C.; Crespy, A.; Martinez-Reyes, J.

    2013-05-01

    The debate for Pacific exotic origin versus in situ inter American plate Atlantic origin of the Caribbean plate is active in the scientific community since decades. Independently of the origin of this plate, its fast motion towards the east at a present rate of 2cm/yr is accepted to have been initiated during the early-most Cenozoic. The Paleocene is a key period in the global evolution of Central America mainly marked also by the Chicxulub multiring meteor impact in Yucatan. We question here the genetic relationship between this impact event and the incipient tectonic escape of the Caribbean plate. The mostly recent published models suggest this impact has affected the whole crust down to the Moho, the upper mantle being rapidly and considerably uplifted. The crust was then fragmented 600km at least from the point of impact, and large circular depressions were rapidly filled by clastic sediments from Cantarell to Western Cuba via Chiapas and Belize. North of the impact, the whole Gulf of Mexico was affected by mass gravity sliding, initiated also during the Paleocene in Texas, remaining active in this basin up to present time. South of the impact, in the Caribbean plate, the Yucatan basin was rapidly opened, indicating a fast escape of the crustal material towards the unique free boundary, the paleo-Antilles subduction zone. Shear waves velocity data below the Caribbean plate suggest this crustal tectonic escape was enhanced by the fast eastward flowing mantle supporting a fragmented and stretched crust. The proposed model suggests Chicxulub impact (but also the hypothetic Beata impact) have fragmented brittle crust, then easily drifted towards the east. This could explain the Paleogene evolution of the Caribbean plate largely stretched during its early evolution. Geologically, this evolution could explain the absence of evident Paleogene oblique subduction along the Caribbean plate northern and southern margins, marked only by Mid Cretaceous dragged volcanic

  5. Mouth of the Colorado River, Gulf of California, Mexico

    NASA Technical Reports Server (NTRS)

    1991-01-01

    The rugged peninsula and eastern coastal plain of northern Baja California are separated from the rest of Mexico by the Gulf of California (32.0N, 115.0W) where the Colorado River is building a delta. Most of the surface features seen here, including the sinuous salt bottomed tidal channel on the delta, have remained unchanged since the first orbital photos in 1961. Irrigated agricultural fields can be seen along the U. S. and Mexico border.

  6. GDGT and alkenone flux in the northern Gulf of Mexico

    USGS Publications Warehouse

    Richey, Julie; Tierney, Jessica E.

    2016-01-01

    This dataset is a weekly to bi-weekly resolution 4-year time series (2010-2014) of GDGT and alkenone flux in the northern Gulf of Mexico. The TEX86 and U37K' indices are also included, which are sea surface temperature proxies based on the distribution of GDGTs and alkenones, respectively. For further information regarding data collection and/or processing methods refer to Richey and Tierney (2016).Richey, J. N., and J. E. Tierney, 2016, GDGT and alkenone flux in the northern Gulf of Mexico: Implications for the TEX86 and U37K' paleothermometers, Paleoceanography, 31, doi:10.1002/2016PA003032.

  7. Geothermal resources of the northern gulf of Mexico basin

    USGS Publications Warehouse

    Jones, P.H.

    1970-01-01

    Published geothermal gradient maps for the northern Gulf of Mexico basin indicate little or no potential for the development of geothermal resources. Results of deep drilling, from 4000 to 7000 meters or more, during the past decade however, define very sharp increases in geothermal gradient which are associated with the occurrence of abnormally high interstitial fluid pressure (geopressure). Bounded by regional growth faults along the landward margin of the Gulf Basin, the geopressured zone extends some 1300 km from the Rio Grande (at the boundary between the United States and Mexico) to the mouth of the Mississippi river. Gulfward, it extends to an unknown distance across the Continental Shelf. Within geopressured deposits, geothermal gradients range upwards to 100 ??C/km, being greatest within and immediately below the depth interval in which the maximum pressure gradient change occurs. The 120 ??C isogeotherm ranges from about 2500 to 5000 m below sea level, and conforms in a general way with depth of occurrence of the top of the geopressured zone. Measured geostatic ratios range upward to 0.97; the maximum observed temperature is 273 ??C, at a depth of 5859 m. Dehydration of montmorillonite, which comprises 60 to 80 percent of clay deposited in the northern Gulf Basin during the Neogene, occurs at depths where temperature exceeds about 80 ??C, and is generally complete at depths where temperature exceeds 120 ??C. This process converts intracrystalline and bound water to free pore water, the volume produced being roughly equivalent to half the volume of montmorillonite so altered. Produced water is fresh, and has low viscosity and density. Sand-bed aquifers of deltaic, longshore, or marine origin form excellent avenues for drainage of geopressured deposits by wells, each of which may yield 10,000 m3 or more of superheated water per day from reservoirs having pressures up to 1000 bars at depths greater than 5000 m. ?? 1971.

  8. Improved Weather Services for Helicopter Operations in the Gulf of Mexico.

    DTIC Science & Technology

    1981-06-01

    FIGURE IN THE (UT OF !’ EXICO , ONE WEATHER OBSERVATION IS REFRESENrATIVE OF A14 AREA WITHIN A 10-1= RADIUS 7 The FAA has issued operational...Description 2 The climate of the northern Gulf of Mexico and adjacent coastal region is determined by four major factors; the :or;r, American...influence is the Gulf, resulting in a maritime tropical climate for the region. During the winter, polar continental air masses move southward into the

  9. Binational collaboration to study Gulf of Mexico's harmful algae

    NASA Astrophysics Data System (ADS)

    Soto, Inia; Hu, Chuanmin; Steidinger, Karen; Muller-Karger, Frank; Cannizzaro, Jennifer; Wolny, Jennifer; Cerdeira-Estrada, Sergio; Santamaria-del-Angel, Eduardo; Tafoya-del-Angel, Fausto; Alvarez-Torres, Porfirio; Herrera Silveira, Jorge; Allen, Jeanne

    2012-01-01

    Blooms of the toxic marine dinoflagellate Karenia brevis cause massive fish kills and other public health and economic problems in coastal waters throughout the Gulf of Mexico [Steidinger, 2009]. These harmful algal blooms (HABs) are a gulf-wide problem that require a synoptic observing system for better serving decision-making needs. The major nutrient sources that initiate and maintain these HABs and the possible connectivity of blooms in different locations are important questions being addressed through new collaborations between Mexican and U.S. researchers and government institutions. These efforts were originally organized under the U.S./Mexico binational partnership for the HABs Observing System (HABSOS), led by the U.S. Environmental Protection Agency's Gulf of Mexico Program (EPAGMP) and several agencies in Veracruz, Mexico, since 2006. In 2010 these efforts were expanded to include other Mexican states and institutions with the integrated assessment and management of the Gulf of Mexico Large Marine Ecosystem (GoMLME) program sponsored by the Global Environment Facility (GEF), the United Nations Industrial Development Organization (UNIDO), the Secretaría de Medio Ambiente y Recursos Naturales (SEMARNAT), and the National Oceanic and Atmospheric Administration (NOAA).

  10. Oceanic and Atmospheric Patterns Associated with Hurricanes Making Gulf of Mexico vs. Atlantic Coast Landfalls

    NASA Astrophysics Data System (ADS)

    Paxton, C. H.; Collins, J. M.

    2011-12-01

    A multi-year clustering is apparent in the location of landfalling hurricanes of Category 2 or greater striking the U.S. Differences in the evolution of hurricane seasons in which landfalls were distinctly on the Gulf of Mexico vs. the Atlantic coast will be presented. Eight seasons with Gulf of Mexico coast landfalls and eight seasons with Atlantic coast landfalls were chosen to illustrate the atmospheric and ocean differences between the two landfall regimes. Monthly averages from December prior to the hurricane season through October were produced to show the evolution of the patterns. For example, La Niña onset was more likely to occur prior to the hurricane season in years with Atlantic coast landfalls, but the onset was later for Gulf of Mexico coast landfall years. More persistent westerly flow in February to May was common for the Gulf of Mexico landfalls, as were negative sea level pressure anomalies over the southern Pacific Ocean. Positive precipitable water anomalies over the main development region were significant and increased from February to September during Gulf of Mexico coast landfall years. Persistent sea level pressure anomalies were present over North Africa in the Atlantic landfalling years but not in the Gulf coast years. The results of this research can be used as guidance to indicate potential landfall locations of strong tropical cyclones during the coming hurricane season.

  11. U.S. Geological Survey program of offshore resource and geoenvironmental studies, Atlantic-Gulf of Mexico region, from September 1, 1976, to December 31, 1978

    USGS Publications Warehouse

    Folger, David W.; Needell, Sally W.

    1983-01-01

    Mineral and energy resources of the continental margins of the United States arc important to the Nation's commodity independence and to its balance of payments. These resources are being studied along the continental margins of the Atlantic Ocean and the Gulf of Mexico in keeping with the mission of the U.S. Geological Survey to survey the geologic structures, mineral resources, and products of the national domain.'(Organic Act of 1879). An essential corollary to these resource studies is the study of potential geologic hazards that may be associated with offshore resource exploration and exploitation. In cooperation with the U.S. Bureau of Land Management, the Geological Survey, through its Atlantic-Gulf of Mexico Marine Geology Program, carries out extensive research to evaluate hazards from sediment mobility, shallow gas, and slumping and to acquire information on the distribution and concentration of trace metals and biogenic and petroleum-derived hydrocarbons in sea-floor sediments. All these studies arc providing needed background information, including information on pollutant dispersal, on the nearshore, estuarine, and lacustrine areas that may be near pipeline and nuclear powerplant sites. Users of these data include the Congress, many Federal agencies, the coastal States, private industry, academia, and the concerned public. The results of the regional structural, stratigraphic, and resource studies carried out under the Atlantic-Gulf of Mexico Marine Geology Program have been used by the Geological Survey and the Bureau of Land Management to select areas for future leasing and to aid in the evaluation of tracts nominated for leasing. Resource studies have concentrated mostly on the Atlantic Outer Continental Shelf frontier areas. Geologic detailing of five major basins along the U.S. Atlantic margin, where sediments are as much as 14 km thick, have been revealed by 25,000 km of 24-and 48-channel common-depth-point seismic data, 187,000 km of

  12. Mechanistic solutions to the opening of the Gulf of Mexico

    USGS Publications Warehouse

    Schouten, Hans; Klitgord, Kim D.

    1994-01-01

    Two mechanistic models-which are unlike the traditional plate-tectonic landfill models used for most proposed Pangea reconstructions of the Yucatán block-relate the Mesozoic opening of the Gulf of Mexico directly to the movement of the North and South American plates: (1) a previous piggyback model in which Yucatán moves with South America out of the western gulf and (2) a new edge-driven model in which the motion of the Yucatán block is caused by forces applied to its margins by the movement of the North and South American plates. In the second model, Yucatán moves out of the northern Gulf of Mexico as a gear or roller bearing. On the basis of magnetic edge anomalies around the gulf, this edge-driven model predicts that from the Bathonian to Tithonian (~170 to ~50 Ma), Yucatán was rotated ~60° counterclockwise as a rigid block between North and South America with rift propagation and extension occurring simultaneously in the Gulf of Mexico and Yucatán Basin.

  13. OCEANOGRAPHY AND METEOROLOGY OF THE GULF OF MEXICO

    DTIC Science & Technology

    Seismic refraction studies Environmental studies off Panama City, Florida Geological Oceanography Chemical oceanography and geochemistry Radiocarbon ... dating of sea water Lipids in sea water Distribution of Mg, Ca, Ba, and Sr, i water Currents and water masses in the Gulf of Mexico Sampling organic

  14. Environmental and economic assessment of discharges from Gulf of Mexico Region Oil and Gas Operations. Quarterly technical progress report, 1 October--31 December 1993

    SciTech Connect

    Gettleson, D.A.

    1994-01-28

    Task 2 (Preparation of the Sampling and Analysis Plan) activities involved the incorporation of the offshore site selection process into the Sampling and Analysis Plan. Task 3 (Environmental Field Sampling and Analysis of NORM, Heavy Metals, and Organics) work included making decisions on tissue analyses and performing analyses of water and sediment samples. Task 4 (Monitoring of the Recovery of Impacted Wetland and Open Bay Produced Water Discharge Sites in Coastal Louisiana and Texas) activities involved the completion of the spring benthos samples collection on pre-termination samples at Four Isle Dome and the first post-termination samples at Delacroix Island. Task 5 (Assessment of Economic Impacts of Offshore and Coastal Discharge Requirements on Present and Future Operations in the Gum of Mexico Region) activities included continued work on development of a base case production forecast, modeling future production, and determining economic impact of treatment technologies. Task 6 (Synthesis of Gulf of Mexico Seafood Consumption and Use Patterns) work involved the completion of the fall survey season and the initiation of the survey data assembly. Task 7 (Technology Transfer Plan) activities included presentations at the Society of Environmental Toxicology and Chemistry annual meeting and Minerals Management Service Information Transfer Meeting. Task 8 (Project Management and Deliverables) activities involved the submission of the necessary reports and routine management.

  15. INDEX OF ESTUARINE BENTHIC INTEGRITY FOR GULF OF MEXICO ESTUARIES

    EPA Science Inventory

    A benthic index for northern Gulf of Mexico estuaries has been developed and successfully validated by the Environmental Monitoring and Assessment Program for Estuaries (EMAP-E) in the Louisianian Province. The benthic index is a useful indicator of estuarine condition that provi...

  16. INDEX OF ESTUARINE BENTHIC INTEGRITY FOR GULF OF MEXICO ESTUARIES

    EPA Science Inventory

    A benthic index for northern Gulf of Mexico estuaries has been developed and successfully validated by the Environmental Monitoring and Assessment Program for Estuaries (EMAP-E) in the Louisianian Province. The benthic index is a useful indicator of estuarine condition that provi...

  17. Distinctiveness of the mesopelagic fish fauna in the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Bangma, Jessica L.; Haedrich, Richard L.

    2008-12-01

    We quantify the similarity of the Gulf of Mexico mesopelagic fish fauna to that in adjacent oceanic regions, the Venezuelan and Colombian Basins of the Caribbean Sea and the North and South Sargasso Seas. The South Sargasso and Colombian are the least similar of the areas in terms of their faunal composition, and the Venezuelan and Colombian Basins are the most similar. The Gulf fauna lies somewhere in between, and is a composite of that in the Sargasso and Caribbean Seas. The Gulf of Mexico displays the greatest abundance, biomass and richness ( S=140 species), and is an intermediate in evenness ( J=0.66) and percent endemism (7.1%). Our findings support the view that the centrally located Gulf is an oceanic ecotone between the Atlantic Tropical and Subtropical faunal regions.

  18. Natural and unnatural oil slicks in the Gulf of Mexico

    PubMed Central

    Garcia‐Pineda, O.; Beet, A.; Daneshgar Asl, S.; Feng, L.; Graettinger, G.; French‐McCay, D.; Holmes, J.; Hu, C.; Huffer, F.; Leifer, I.; Muller‐Karger, F.; Solow, A.; Silva, M.; Swayze, G.

    2015-01-01

    Abstract When wind speeds are 2–10 m s−1, reflective contrasts in the ocean surface make oil slicks visible to synthetic aperture radar (SAR) under all sky conditions. Neural network analysis of satellite SAR images quantified the magnitude and distribution of surface oil in the Gulf of Mexico from persistent, natural seeps and from the Deepwater Horizon (DWH) discharge. This analysis identified 914 natural oil seep zones across the entire Gulf of Mexico in pre‐2010 data. Their ∼0.1 µm slicks covered an aggregated average of 775 km2. Assuming an average volume of 77.5 m3 over an 8–24 h lifespan per oil slick, the floating oil indicates a surface flux of 2.5–9.4 × 104 m3 yr−1. Oil from natural slicks was regionally concentrated: 68%, 25%, 7%, and <1% of the total was observed in the NW, SW, NE, and SE Gulf, respectively. This reflects differences in basin history and hydrocarbon generation. SAR images from 2010 showed that the 87 day DWH discharge produced a surface‐oil footprint fundamentally different from background seepage, with an average ocean area of 11,200 km2 (SD 5028) and a volume of 22,600 m3 (SD 5411). Peak magnitudes of oil were detected during equivalent, ∼14 day intervals around 23 May and 18 June, when wind speeds remained <5 m s−1. Over this interval, aggregated volume of floating oil decreased by 21%; area covered increased by 49% (p < 0.1), potentially altering its ecological impact. The most likely causes were increased applications of dispersant and surface burning operations. PMID:27774370

  19. Natural and unnatural oil slicks in the Gulf of Mexico

    USGS Publications Warehouse

    MacDonald, Ian R.; O. Garcia-Pineda,; A. Beet,; S. Daneshgar Asl,; L. Feng,; D. G. Graettinger,; D. French-McCay,; J. Holmes,; C. Hu,; F. Huffer,; I. Leifer,; F. Mueller-Karger,; A. Solow,; M. Silva,; Swayze, Gregg A.

    2015-01-01

    When wind speeds are 2 – 10 m s−1, reflective contrasts in the ocean surface make oil slicks visible to synthetic aperture radar (SAR) under all sky conditions. Neural network analysis of satellite SAR images quantified the magnitude and distribution of surface oil in the Gulf of Mexico from persistent, natural seeps and from the Deepwater Horizon (DWH) discharge. This analysis identified 914 natural oil seep zones across the entire Gulf of Mexico in pre-2010 data. Their ∼0.1 µm slicks covered an aggregated average of 775 km2. Assuming an average volume of 77.5 m3over an 8 – 24 h lifespan per oil slick, the floating oil indicates a surface flux of 2.5 – 9.4 × 104 m3 y−1. Oil from natural slicks was regionally concentrated: 68%, 25%, 7%, and <1% of the total was observed in the NW, SW, NE and SE Gulf, respectively. This reflects differences in basin history and hydrocarbon generation. SAR images from 2010 showed that the 87-day DWH discharge produced a surface-oil footprint fundamentally different from background seepage, with an average ocean area of 11,200 km2 (SD 5,028) and a volume of 22,600 m3 (SD 5,411). Peak magnitudes of oil were detected during equivalent, ∼14-day intervals around 23 May and 18 June, when wind speeds remained <5 m s−1. Over this interval, aggregated volume of floating oil decreased by 21%; area covered increased by 49% (p < .1), potentially altering its ecological impact. The most likely causes were increased applications of dispersant and surface burning operations.

  20. Natural and unnatural oil slicks in the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    MacDonald, I. R.; Garcia-Pineda, O.; Beet, A.; Daneshgar Asl, S.; Feng, L.; Graettinger, G.; French-McCay, D.; Holmes, J.; Hu, C.; Huffer, F.; Leifer, I.; Muller-Karger, F.; Solow, A.; Silva, M.; Swayze, G.

    2015-12-01

    When wind speeds are 2-10 m s-1, reflective contrasts in the ocean surface make oil slicks visible to synthetic aperture radar (SAR) under all sky conditions. Neural network analysis of satellite SAR images quantified the magnitude and distribution of surface oil in the Gulf of Mexico from persistent, natural seeps and from the Deepwater Horizon (DWH) discharge. This analysis identified 914 natural oil seep zones across the entire Gulf of Mexico in pre-2010 data. Their ˜0.1 µm slicks covered an aggregated average of 775 km2. Assuming an average volume of 77.5 m3 over an 8-24 h lifespan per oil slick, the floating oil indicates a surface flux of 2.5-9.4 × 104 m3 yr-1. Oil from natural slicks was regionally concentrated: 68%, 25%, 7%, and <1% of the total was observed in the NW, SW, NE, and SE Gulf, respectively. This reflects differences in basin history and hydrocarbon generation. SAR images from 2010 showed that the 87 day DWH discharge produced a surface-oil footprint fundamentally different from background seepage, with an average ocean area of 11,200 km2 (SD 5028) and a volume of 22,600 m3 (SD 5411). Peak magnitudes of oil were detected during equivalent, ˜14 day intervals around 23 May and 18 June, when wind speeds remained <5 m s-1. Over this interval, aggregated volume of floating oil decreased by 21%; area covered increased by 49% (p < 0.1), potentially altering its ecological impact. The most likely causes were increased applications of dispersant and surface burning operations.

  1. Natural and unnatural oil slicks in the Gulf of Mexico.

    PubMed

    MacDonald, I R; Garcia-Pineda, O; Beet, A; Daneshgar Asl, S; Feng, L; Graettinger, G; French-McCay, D; Holmes, J; Hu, C; Huffer, F; Leifer, I; Muller-Karger, F; Solow, A; Silva, M; Swayze, G

    2015-12-01

    When wind speeds are 2-10 m s(-1), reflective contrasts in the ocean surface make oil slicks visible to synthetic aperture radar (SAR) under all sky conditions. Neural network analysis of satellite SAR images quantified the magnitude and distribution of surface oil in the Gulf of Mexico from persistent, natural seeps and from the Deepwater Horizon (DWH) discharge. This analysis identified 914 natural oil seep zones across the entire Gulf of Mexico in pre-2010 data. Their ∼0.1 µm slicks covered an aggregated average of 775 km(2). Assuming an average volume of 77.5 m(3) over an 8-24 h lifespan per oil slick, the floating oil indicates a surface flux of 2.5-9.4 × 10(4) m(3) yr(-1). Oil from natural slicks was regionally concentrated: 68%, 25%, 7%, and <1% of the total was observed in the NW, SW, NE, and SE Gulf, respectively. This reflects differences in basin history and hydrocarbon generation. SAR images from 2010 showed that the 87 day DWH discharge produced a surface-oil footprint fundamentally different from background seepage, with an average ocean area of 11,200 km(2) (SD 5028) and a volume of 22,600 m(3) (SD 5411). Peak magnitudes of oil were detected during equivalent, ∼14 day intervals around 23 May and 18 June, when wind speeds remained <5 m s(-1). Over this interval, aggregated volume of floating oil decreased by 21%; area covered increased by 49% (p < 0.1), potentially altering its ecological impact. The most likely causes were increased applications of dispersant and surface burning operations.

  2. 78 FR 46820 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-08-02

    ..., Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of Mexico; Reef Fish Management... measures described in a framework action to the Fishery Management Plan for the Reef Fish Resources of the... annual catch limit (ACL), and removes the requirement for reef fish vessels to have onboard and use...

  3. A comparative study of US EPA 1996 and 1999 emission inventories in the west Gulf of Mexico coast region, USA.

    PubMed

    Lin, Che-Jen; Ho, Thomas C; Chu, Hsing-wei; Yang, Heng; Mojica, Martha J; Krishnarajanagar, Nagesh; Chiou, Paul; Hopper, Jack R

    2005-06-01

    Emission inventory is one of the required inputs to air quality models. To assist in the urban and regional modeling efforts, United States Environmental Protection Agency (EPA) has compiled a National Emission Inventory (NEI) for criterion pollutants, and the precursors of ozone and particulate matter (PM). In December 2002, EPA released the 1999 NEI estimates (NEI99), which represent the most recent national emission data. However, the data sets are not in model-ready format for air quality simulations. This present work converts the NEI99 Final Version 2 data sets into Inventory Data Analyzer (IDA) format and processes the data using the Sparse Matrix Operator Kernel Emissions (SMOKE) modeling system to generate a gridded emission inventory in a domain covering the west Gulf Coast Region, USA. The spatial and diurnal emission characteristics of the gridded emission inventories are then assessed and compared with those of the National Emission Trend 1996 (NET96). The NEI99 database contains more complete emission records in both area and point sources. It is also found that NEI99 data exhibit greater emissions with respect to point and mobile sources but smaller emissions with respect to area sources when compared to the corresponding gridded NET96 data in the same study domain. The most distinct differences between the NEI99 and NET96 databases are CO emission of mobile sources, SO2 emissions of point sources, and VOC/PM/NH3/NOx emissions of area and non-road sources. The gridded NEI99 data show low VOC/NOx ratios (<2-5) in the urban areas of the study domain.

  4. 76 FR 50979 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-08-17

    ... Resources of the Gulf of Mexico (FMP), as prepared and submitted by the Gulf of Mexico Fishery Management..., speculation, or environmental protection. As a result, prospective entities may be businesses, nonprofit..., all entities that possess a valid or renewable commercial reef fish permit are assumed to comprise the...

  5. 76 FR 67618 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-11-02

    ... final rule increases the 2011 commercial quota for red grouper, and thereby increases the 2011 commercial quota for shallow water grouper (SWG), sets the commercial quota for red grouper and SWG from 2012..., Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of Mexico; Red Grouper...

  6. 76 FR 22345 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-21

    ... to reduce overfishing of gag in the Gulf of Mexico (Gulf). This rule would reduce the commercial... reduce overfishing of the gag resource in the Gulf. DATES: Written comments must be received on or before... prevent overfishing and achieve, on a continuing basis, the optimum yield (OY) from federally managed...

  7. Hurricane Ivan’s Impact Along the Northern Gulf of Mexico. Volume 86, Number 48

    DTIC Science & Technology

    2005-11-29

    likely, The Northern Gulf Of Mexico according to numerical hindcasts. Impacts on Shelf/Slope Circulation and PAGES 497,500-501 were recorded as Ivan...17 Sep 2004 hurricanes recently to enter the Gulf of Mexico . Although it weakened from a very power- ful Category 5 hurricane to a Category 3 before...summarizes what re- searchers have learned about Hurricane Ivan as it moved into the Gulf and made landfall along the northeastern Gulf of Mexico

  8. Exploration frontiers in the eastern and southern Gulf of Mexico

    SciTech Connect

    Watkins, J.S.; Buffler, R.T.

    1996-09-01

    At least six offshore regions of the eastern and southern Gulf of Mexico have exploration potential. From northeast to southwest, these are the DeSoto Canyon Salt basin, the West Florida shelf, the North Cuba arch, the continental rise and abyssal plain at the foot of the northern Campeche escarpment, the Gulf of Campeche and the Mexican Ridge province. With the exception of the West Florida shelf, all are in water deeper than 200 m. The subsalt section in the DeSoto Canyon Salt basin remains untested in spite of the fact that subsalt sediments produce offshore Brazil, off west Africa and elsewhere. Target depths are as shallow at 15,000 ft. The West Florida platform has production potential in the Brown dolomite and possibly other reservoirs. Production potential may extend to the Florida Keys where a 1958 well located off structure produced 15 BOPD. The North Cuba arch is a peripheral bulge north of the Cuba trench. Off scaped and accreted sediments from this section produce along the northern coast of Cuba. Structurally similar rocks produce in the South China Sea north of the Palawan-Borneo trench. Off the northern part of the Campeche escarpment, onlapping sediments ranging in age from Jurassic to Recent may have created stratigraphic traps while salt diapirism and faulting further offshore may have created structural traps. Some subsalt synrift sediments may be within the gas window. Structure and stratigraphy of the Gulf of Campeche appear to closely resemble those of the Texas-Louisiana shelf and slope. Prolific production characterizes these sediments onshore south of the Gulf; their deep-water potential would appear to be equally great. The north-trending Mexican Ridge province is 500 km long and 200 km wide. It consists of a large number of subparallel low-amplitude folds up to 10 km wide and 200 km long. Structurally, these folds resemble a foreland fold belt. Bright spots are evident in anticlines. The production potential could be immense.

  9. THE ECOLOGICAL CONDITION OF ESTUARIES: A FOCUS ON THE ATLANTIC OCEAN AND GULF OF MEXICO COASTS OF THE UNITED STATES

    EPA Science Inventory

    Monitoring the estuaries of the Atlantic Ocean and Gulf of Mexico coastlines was performed annually from 1990 to 1997 to assess ecological conditions on a regional basis for four biogeographic provinces. These province estimates - Virginian, Carolinian, West Indian, and Louisiani...

  10. THE ECOLOGICAL CONDITION OF ESTUARIES: A FOCUS ON THE ATLANTIC OCEAN AND GULF OF MEXICO COASTS OF THE UNITED STATES

    EPA Science Inventory

    Monitoring the estuaries of the Atlantic Ocean and Gulf of Mexico coastlines was performed annually from 1990 to 1997 to assess ecological conditions on a regional basis for four biogeographic provinces. These province estimates - Virginian, Carolinian, West Indian, and Louisiani...

  11. Marine and Estuarine Ecology. Man and the Gulf of Mexico.

    ERIC Educational Resources Information Center

    Irby, Bobby N.; And Others

    "Man and the Gulf of Mexico (MGM)" is a marine science curriculum developed to meet the marine science needs of tenth through twelfth grade students in Mississippi and Alabama schools. This MGM unit, which focuses on marine and estuarine ecology, is divided into six sections. The first section contains unit objectives, discussions of the…

  12. NASA MISR Images Gulf of Mexico Oil Slick

    NASA Image and Video Library

    2010-05-06

    This image from NASA Terra satellite was acquired on May 1, 2010. The red symbol indicates the approximate position of the Deepwater Horizon platform and the source of the oil slick which resulted in a significant oil spill in the Gulf of Mexico.

  13. Evidence of multidecadal climate variability in the Gulf of Mexico

    USGS Publications Warehouse

    Poore, Richard Z.; Brock, John C.

    2011-01-01

    The northern Gulf of Mexico coastal region is vulnerable to a variety of natural hazards, many of which are linked to climate and climate variability. Hurricanes, which are one such climate-related hazard, are a major recurring problem, and the active hurricane seasons of 2004 and 2005 raised interest in better understanding the controls and risks of hurricanes. Examination of historical records reveals intervals of alternating low and high hurricane activity that appear to be related to changes in average sea-surface temperature in the North Atlantic Ocean. Analyses of instrumental temperature records from the North Atlantic show decadal-scale oscillations of slightly higher versus slightly lower average temperature extending back in time for over 100 years. This oscillation is known as the Atlantic Multidecadal Oscillation (AMO).

  14. Marine Habitats. Man and the Gulf of Mexico Series.

    ERIC Educational Resources Information Center

    Irby, Bobby N.; And Others

    "Man and the Gulf of Mexico (MGM)" is a marine science curriculum developed to meet the marine science needs of tenth through twelfth grade students in Mississippi and Alabama schools. This MGM unit, which focuses on marine habitats, contains an introduction (with unit objectives and brief introductory comments) followed by five…

  15. Notification: Evaluate the Gulf of Mexico Hypoxic Zone Reduction

    EPA Pesticide Factsheets

    Project #OPE-FY13-0012, January 30, 2013. The Office of Inspector General (OIG) is starting preliminary research on the U.S. Environmental Protection Agency’s (EPA’s) and states’ efforts to reduce the Gulf of Mexico hypoxic zone.

  16. Toxiological Considerations in the Gulf of Mexico Oil Spill

    EPA Science Inventory

    The Deep Water Horizon oil rig exploded on April 20, 2010, resulting in an ongoing release of light sweet petroleum crude oil and methane into Gulf of Mexico waters. The release from the deepwater wellhead 41 miles from Louisiana is at approximately 1 mile depth, and flow rates e...

  17. Toxiological Considerations in the Gulf of Mexico Oil Spill

    EPA Science Inventory

    The Deep Water Horizon oil rig exploded on April 20, 2010, resulting in an ongoing release of light sweet petroleum crude oil and methane into Gulf of Mexico waters. The release from the deepwater wellhead 41 miles from Louisiana is at approximately 1 mile depth, and flow rates e...

  18. Early results from the Northern Gulf of Mexico Ecosystem Change and Hazard Susceptibility Project

    USGS Publications Warehouse

    Brock, John C.; Lavoie, Dawn L.; Poore, Richard Z.

    2011-01-01

    The northern Gulf of Mexico coastal region and its diverse ecosystems are threatened by population and development pressure and by the impacts of rising sea level and severe storms such as the series of hurricanes that has impacted the northern Gulf in recent years. In response to the complex management issues facing the region, the U.S. Geological Survey (USGS) organized a multidisciplinary research program to coordinate the activities of USGS and other scientists working in the northern Gulf of Mexico region (fig. 1). The Northern Gulf of Mexico (NGOM) Ecosystem Change and Hazard Susceptibility Project aims to develop a thorough understanding of the dynamic coastal ecosystems on the northern Gulf coast, the impact of human activities on these ecosystems, and the vulnerability of ecosystems and human communities to more frequent and more intense hurricanes in the future. A special issue of Geo-Marine Letters published in December 2009 is devoted to early results of studies completed as part of this project. These studies, which have been conducted at sites throughout the northern Gulf region, from the Chandeleur Islands to Apalachicola Bay, have focused on three themes: (1) The underlying geologic framework that exerts controls over coastal processes (2) The impact of human activities on nearshore water quality (3) Hurricanes and associated effects

  19. Hurricane Ivan's Impact Along the Northern Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Stone, Gregory W.; Walker, Nan D.; Hsu, S. A.; Babin, Adele; Liu, Baozhu; Keim, Barry D.; Teague, William; Mitchell, Douglas; Leben, Robert

    2005-11-01

    Just over a year after the landfall of Hurricane Ivan, scientists have now had an opportunity to evaluate a variety of oceanographic and geologic responses to this storm. Hurricanes Ivan, Katrina, and Rita are among the most powerful hurricanes recently to enter the Gulf of Mexico. Although it weakened from a very powerful Category 5 hurricane to a Category 3 before making landfall along the Alabama coast, Hurricane Ivan devastated the coasts of northwestern Florida and Alabama on 16 September 2004. This article summarizes what researchers have learned about Hurricane Ivan as it moved into the Gulf and made landfall along the northeastern Gulf of Mexico coast. The article focuses on storm meteorology, sea state, shelf circulation, and sediment transport on the shelf and along the coast.

  20. Lagrangian dynamical geography of the Gulf of Mexico.

    PubMed

    Miron, P; Beron-Vera, F J; Olascoaga, M J; Sheinbaum, J; Pérez-Brunius, P; Froyland, G

    2017-08-01

    We construct a Markov-chain representation of the surface-ocean Lagrangian dynamics in a region occupied by the Gulf of Mexico (GoM) and adjacent portions of the Caribbean Sea and North Atlantic using satellite-tracked drifter trajectory data, the largest collection so far considered. From the analysis of the eigenvectors of the transition matrix associated with the chain, we identify almost-invariant attracting sets and their basins of attraction. With this information we decompose the GoM's geography into weakly dynamically interacting provinces, which constrain the connectivity between distant locations within the GoM. Offshore oil exploration, oil spill contingency planning, and fish larval connectivity assessment are among the many activities that can benefit from the dynamical information carried in the geography constructed here.

  1. GEMINI-TITAN (GT)-9 TEST - TRAINING - GULF OF MEXICO

    NASA Image and Video Library

    1965-05-20

    S65-22656 (14 April 1965) --- The Gemini-Titan 4 prime crew, astronauts Edward H. White II (left), pilot, and James A. McDivitt, command pilot, pictured aboard the NASA Motor Vessel Retriever in the Gulf of Mexico.

  2. Manatees in the Gulf of Mexico

    USGS Publications Warehouse

    Bonde, Robert K.; Lefebvre, Lynn W.

    2001-01-01

    The endangered Florida manatee (Trichechus manatus latirostris) inhabits rivers and estuaries along both coasts of Florida and, to a lesser extent, adjacent states (Figure 1). Since 1990, documented sightings of manatees outside of Florida have been increasing. This increase in sightings probably represents northward shifts in manatee distribution made possible by man-made sources of warm water (i.e., industrial effluents), as well as a decade of relatively warm winters. The most likely source of emigrants on the Gulf coast is the population of manatees that overwinter in the headwaters of the Crystal and Homosassa Rivers, Citrus County, FL. This group of manatees has undergone a steady increase in numbers, (approximately 7% per year from 1977-1991; Eberhardt and O’Shea 1995). Some emigrants may also come from the Tampa-Ft. Myers region, where human impacts on habitat are greater. Manatees are intelligent, long-lived mammals that appear to adapt readily to new environments and situations. However, manatees have relatively low metabolic rates, and cold winter temperatures restrict their northern distribution.

  3. Summary Report on Information Technology Integration Activities For project to Enhance NASA Tools for Coastal Managers in the Gulf of Mexico and Support Technology Transfer to Mexico

    SciTech Connect

    Gulbransen, Thomas C.

    2009-04-27

    Deliverable to NASA Stennis Space Center summarizing summarizes accomplishments made by Battelle and its subcontractors to integrate NASA's COAST visualization tool with the Noesis search tool developed under the Gulf of Mexico Regional Collaborative project.

  4. 78 FR 14225 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Gulf of Mexico Reef Fish Fishery...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-03-05

    .... This action is necessary to reduce overfishing of the gray triggerfish resource in the Gulf of Mexico... Magnuson-Stevens Act implemented new requirements that ACLs and AMs be established to end overfishing and prevent overfishing from occurring. Accountability measures are management controls to prevent ACLs...

  5. 77 FR 4493 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Comprehensive Ecosystem-Based...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-01-30

    ..., Gulf of Mexico, and South Atlantic; Comprehensive Ecosystem-Based Amendment 2 for the South Atlantic... Ecosystem-Based Amendment 2 (CE-BA 2) for the South Atlantic region. The final rule adds Appendix E to part...

  6. 75 FR 39638 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Comprehensive Ecosystem-Based...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-12

    ..., Gulf of Mexico, and South Atlantic; Comprehensive Ecosystem-Based Amendment 1 for the South Atlantic... the final rule to implement Comprehensive Ecosystem-Based Amendment 1 for the South Atlantic region...

  7. Point source dispersion of surface drifters in the southern Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Zavala Sanson, Luis; Perez-Brunius, Paula; Sheinbaum, Julio

    2017-04-01

    The dispersion of surface drifters released from five specific locations in the southern Gulf of Mexico is described. The results provide a statistical estimation over a 7-year period of the spread of a cloud of floats from point sources in the region. It is shown that the drifter dispersion is strongly affected by the main mesoscale circulations features frequently observed in this area. Some of them are the anticyclonic eddies shed by the Loop Current at the eastern side of the Gulf of Mexico, and the semi-permanent cyclonic gyre at the Bay of Campeche. The results are examined further in terms of two dominant and contrasting dispersion scenarios: (i) an intense northward advection of drifters, preferentially along the western margin, and (ii) the retention of drifters in the southernmost part of the Gulf of Mexico.

  8. Sources, trends and regional impacts of fine particulate matter in southern Mississippi valley: significance of emissions from sources in the Gulf of Mexico coast

    NASA Astrophysics Data System (ADS)

    Chalbot, M.-C.; McElroy, B.; Kavouras, I. G.

    2013-04-01

    The sources of fine particles over a 10 yr period at Little Rock, Arkansas, an urban area in the southern Mississippi Valley, were identified by positive matrix factorization. The annual trends of PM2.5 and its sources, and their associations with the pathways of air mass backward trajectories were examined. Seven sources were apportioned, namely, primary traffic particles, secondary nitrate and sulphate, biomass burning, diesel particles, aged/contaminated sea salt and mineral/road dust, accounting for more than 90% of measured PM2.5 (particles with aerodynamic diameter less than 2.5 μm) mass. The declining trend of PM2.5 mass (0.4 μg m-3 per year) was related to lower levels of SO42- (0.2 μg m-3 per year) due to SO2 reductions from point and mobile sources. The slower decline for NO3- particles (0.1 μg m-3 per year) was attributed to the increasing NH3 emissions in the Midwest. The annual variation of biomass burning particles was associated with fires in the southeast and northwest US. Of the four regions within 500 km from the receptor site, the Gulf Coast and the southeast US accounted cumulatively for more than 65% of PM2.5 mass, nitrate, sulphate and biomass burning aerosol. Overall, more than 50% of PM2.5 and its components originated from sources outside the state. Sources within the Gulf Coast and western Gulf of Mexico include 65% of the busiest ports in the US, intense marine traffic within 400 km of the coast burning rich in S diesel, and a large number of offshore oil and natural gas platforms and many refineries. This approach allowed for the quantitative assessment of the impacts of transport from regions representing diverse mixtures of sources and weather conditions for different types of particles. The findings of this effort demonstrated the influences of emission controls on SO2 and NOx on PM2.5 mass, the potential effect of events (i.e. fires) sensitive to climate change phenomena on air pollution and the potential of offshore activities

  9. Sources, trends and regional impacts of fine particulate matter in southern Mississippi Valley: significance of emissions from sources in the Gulf of Mexico coast

    NASA Astrophysics Data System (ADS)

    Chalbot, M.-C.; McElroy, B.; Kavouras, I. G.

    2013-01-01

    The sources of fine particles over a 10 yr period at Little Rock, Arkansas, an urban area in southern Mississippi Valley, were identified by positive matrix factorization. The annual trends of PM2.5 and its sources and their associations with the pathways of air mass backward trajectories were examined. Seven sources were apportioned, namely, primary traffic particles, secondary nitrate and sulphate, biomass burning, diesel particles, aged/contaminated sea salt and mineral/road dust, accounting for more than 90% of measured PM2.5 mass. The declining trend of PM2.5 mass (0.4 μg m-3 yr-1) was related to lower levels of SO42- (0.2 μg m-3 yr-1) due to SO2 reductions from point and mobile sources. The slower decline for NO3- particles (0.1 μg m-3 yr-1) was attributed to the spatial variability of NH3 in Midwest. The annual variation of biomass burning particles was associated with wildland fires in southeast and northwest US that are sensitive to climate changes. The four regions within 500 km from the receptor site, the Gulf Coast and southeast US accounted cumulatively for more than 65% of PM2.5 mass, nitrate, sulphate and biomass burning aerosol. Overall, more than 50% of PM2.5 and its sources originated from sources outside the state. Sources within the Gulf Coast and western Gulf of Mexico include 65% of the busiest ports in the US, intense marine traffic within 400 km of the coast burning rich in S diesel, and a large number of offshore oil and natural gas platforms and many refineries along the coast. This approach allowed for quantitatively assessing the impacts of transport from regions representing diverse mixtures of sources and weather conditions for different types of particles. The findings of this effort demonstrated the influences of emission controls on SO2 and NOx on PM2.5 mass, the potential effect of events (i.e. fires) sensitive to climate change phenomena on air pollution and the potential of offshore activities and shipping emissions to

  10. Mapping the Intricacies of the Gulf of Mexico's Circulation

    NASA Astrophysics Data System (ADS)

    Lugo-Fernández, Alexis; Green, Rebecca E.

    2011-01-01

    From hosting key shipping lines, drilling platforms, and commercial fisheries, to sustaining mangrove swamps that shelter the coastline from the hurricanes that churn its waters, the Gulf of Mexico is important to the nations surrounding it for socio-economic, ecological, military, political, and scientific reasons. Critical to all of these sectors is the Gulf's circulation—it controls hurricane tracks and intensity, biological productivity, and larvae dispersal. Since 1982, the Environmental Studies Program (ESP) of the U.S. Bureau of Ocean Energy Management, Regulation and Enforcement (BOEMRE) has invested more than $67 million in field and numerical modeling studies to improve our understanding of the Gulf's circulation (see Figure 1). ESP-funded research has covered a broad array of topics, some applied and some basic. Studies carried out on behalf of the bureau reflect the bureau's information needs, stakeholder input, and offshore energy exploration and development trends. All ESP studies culminate in a technical report—127 technical reports on physical oceanography are publicly available (see http://www.gomr.boemre.gov/homepg/regulate/environ/techsumm/rec_pubs.html). Additionally, more than 100 peer-reviewed publications have been issued on the Gulf's physical oceanography and circulation. The AGU Geophysical Monograph Circulation in the Gulf of Mexico: Observations and Models, the very first circulation overview since 1972, was funded by ESP. Additionally, data collected during fieldwork are deposited in national archives for public dissemination.

  11. 77 FR 59901 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-01

    ... consists of principal law enforcement officers in each of the Gulf States, as well as the National Oceanic... National Oceanic and Atmospheric Administration RIN 0648-XC262 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of a public meeting. SUMMARY: The Gulf of Mexico...

  12. 75 FR 39495 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-09

    ... consists of principal law enforcement officers in each of the Gulf States, as well as the National Oceanic... National Oceanic and Atmospheric Administration RIN 0648-XX42 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of a public meeting. SUMMARY: The Gulf of Mexico...

  13. A statistical description of the velocity fields from upper ocean drifters in the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    DiMarco, Steven F.; Nowlin, Worth D., Jr.; Reid, R. O.

    We analyzed 1397 drifter records collected in the Gulf of Mexico and northwestern Cayman Basin between the years 1989 and 1999 to describe the general features of the upper ocean circulation. These drifters were generally drogued at 50 m below the surface and exclude those of the Surface CUrrent Lagrangian Program (SCULP). In addition to the dominant flows through the Yucatan Channel and Straits of Florida, robust circulation features clearly seen include: a weak cyclone south of 21°N in the Bay of Campeche, westward zonal flow across the Gulf between 21°N and 24°N, a northward western boundary current between 95°W and 97°W and 24°N and 26°N, mean downcoast (westward) flow on the Texas-Louisiana shelf, highly variable mean flow on the shelves and slope of the northeastern Gulf, mean upcoast (southward) flow on the lower West Florida Shelf, and a large region of high variability in the deep regions of the central Gulf of Mexico. Although much of the driving of the Gulf of Mexico is attributed to currents associated with the Loop Current and its associated Loop Current Eddies (particularly in the deep waters), other features can be directly correlated with seasonal wind driving, particularly on the shelves of the northern Gulf, near the western boundary, and in the Bay of Campeche.

  14. Using Acoustic Tomography to Monitor Deep Ocean Currents in the Eastern Gulf of Mexico

    DTIC Science & Technology

    2010-06-01

    Toward the improved prediction and monitoring of deep-water currents and eddies in the Gulf of Mexico , the Gulf Eddy Monitoring System group (GEMS...proposes that a network of acoustic transmitter receiver pairs be deployed in the northeastern Gulf of Mexico . Acoustic travel times are inverted to

  15. 75 FR 69402 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-11-12

    ... National Oceanic and Atmospheric Administration RIN 0648-XA028 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of a public meeting. SUMMARY: The Gulf of Mexico Fishery Management Council in conjunction with the Gulf & South Atlantic Fisheries Foundation will convene a...

  16. 76 FR 39857 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-07

    ... National Oceanic and Atmospheric Administration RIN 0648-XA549 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Council to convene a public meeting. SUMMARY: The Gulf of Mexico Fishery... and conclude by 3 p.m., Thursday, July 28, 2011. ADDRESSES: The meeting will be held at the Gulf of...

  17. 75 FR 74008 - Gulf of Mexico Fishery Management Council; Public Meetings

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-11-30

    ... CONTACT: Jeff Rester, Habitat Support Specialist, Gulf States Marine Fisheries Commission; telephone: (228... National Oceanic and Atmospheric Administration RIN 0648-XA068 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of public meetings. SUMMARY: The Gulf of Mexico...

  18. ESTIMATING THE ECOLOGICAL CONDITION OF THE ESTUARIES OF THE GULF OF MEXICO

    EPA Science Inventory

    Monitoring of estuaries in the Louisianian Province was performed annually from 1991-1994 to assess ecological conditions on a regional scale. We found over the four years of monitoring, 25|6% of Gulf of Mexico estuarine sediments in the Louisianian Province displayed poor biolog...

  19. ESTIMATING THE ECOLOGICAL CONDITION OF THE ESTUARIES OF THE GULF OF MEXICO

    EPA Science Inventory

    Monitoring of estuaries in the Louisianian Province was performed annually from 1991-1994 to assess ecological conditions on a regional scale. We found over the four years of monitoring, 25|6% of Gulf of Mexico estuarine sediments in the Louisianian Province displayed poor biolog...

  20. Produced water discharges to the Gulf of Mexico: Background information for ecological risk assessments

    SciTech Connect

    Meinhold, A.F.; Holtzman, S.; DePhillips, M.P.

    1996-06-01

    This report reviews ecological risk assessment concepts and methods; describes important biological resources in the Gulf of Mexico of potential concern for produced water impacts; and summarizes data available to estimate exposure and effects of produced water discharges. The emphasis is on data relating to produced water discharges in the central and western Gulf of Mexico, especially in Louisiana. Much of the summarized data and cited literature are relevant to assessments of impacts in other regions. Data describing effects on marine and estuarine fishes, mollusks, crustaceans and benthic invertebrates are emphasized. This review is part of a series of studies of the health and ecological risks from discharges of produced water to the Gulf of Mexico. These assessments will provide input to regulators in the development of guidelines and permits, and to industry in the use of appropriate discharge practices.

  1. Strain-Rate Dependency of Strength of Soft Marine Deposits of the Gulf of Mexico

    DTIC Science & Technology

    2010-06-01

    abstract number: 090612-057 Strain-rate dependency of strength of soft marine deposits of the Gulf of Mexico Andrei Abelev and Philip Valent...from the Gulf of Mexico . The vane test may not always be the most accurate method of describing the undrained shear strength, mainly because it...deposits of the Gulf of Mexico 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) 5d. PROJECT NUMBER 5e. TASK NUMBER

  2. A screening model analysis of mercury sources, fate and bioaccumulation in the Gulf of Mexico.

    PubMed

    Harris, Reed; Pollman, Curtis; Hutchinson, David; Landing, William; Axelrad, Donald; Morey, Steven L; Dukhovskoy, Dmitry; Vijayaraghavan, Krish

    2012-11-01

    A mass balance model of mercury (Hg) cycling and bioaccumulation was applied to the Gulf of Mexico (Gulf), coupled with outputs from hydrodynamic and atmospheric Hg deposition models. The dominant overall source of Hg to the Gulf is the Atlantic Ocean. Gulf waters do not mix fully however, resulting in predicted spatial differences in the relative importance of external Hg sources to Hg levels in water, sediments and biota. Direct atmospheric Hg deposition, riverine inputs, and Atlantic inputs were each predicted to be the most important source of Hg to at least one of the modeled regions in the Gulf. While incomplete, mixing of Gulf waters is predicted to be sufficient that fish Hg levels in any given location are affected by Hg entering other regions of the Gulf. This suggests that a Gulf-wide approach is warranted to reduce Hg loading and elevated Hg concentrations currently observed in some fish species. Basic data to characterize Hg concentrations and cycling in the Gulf are lacking but needed to adequately understand the relationship between Hg sources and fish Hg concentrations.

  3. EAARL Coastal Topography - Northern Gulf of Mexico

    USGS Publications Warehouse

    Nayegandhi, Amar; Brock, John C.; Sallenger, Abby; Wright, C. Wayne; Travers, Laurinda J.; Lebonitte, James

    2008-01-01

    These remotely sensed, geographically referenced elevation measurements of Lidar-derived coastal topography were produced as a collaborative effort between the U.S. Geological Survey (USGS), Florida Integrated Science Center (FISC), St. Petersburg, FL and the National Aeronautics and Space Administration (NASA), Wallops Flight Facility, VA. One objective of this research is to create techniques to survey areas for the purposes of geomorphic change studies following major storm events. The USGS Coastal and Marine Geology Program's National Assessment of Coastal Change Hazards project is a multi-year undertaking to identify and quantify the vulnerability of U.S. shorelines to coastal change hazards such as effects of severe storms, sea-level rise, and shoreline erosion and retreat. Airborne Lidar surveys conducted during periods of calm weather are compared to surveys collected following extreme storms in order to quantify the resulting coastal change. Other applications of high-resolution topography include habitat mapping, ecological monitoring, volumetric change detection, and event assessment. The purpose of this project is to provide highly detailed and accurate datasets of the northern Gulf of Mexico coastal areas, acquired on September 19, 2004, immediately following Hurricane Ivan. The datasets are made available for use as a management tool to research scientists and natural resource managers. An innovative airborne Lidar instrument originally developed at the NASA Wallops Flight Facility, and known as the Experimental Airborne Advanced Research Lidar (EAARL), was used during data acquisition. The EAARL system is a raster-scanning, waveform-resolving, green-wavelength (532 nanometer) Lidar designed to map near-shore bathymetry, topography, and vegetation structure simultaneously. The EAARL sensor suite includes the raster-scanning, water-penetrating full-waveform adaptive Lidar, a down-looking RGB (red-green-blue) digital camera, a high-resolution multi

  4. 78 FR 57534 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-09-19

    ... following domestic fisheries in the Caribbean, Gulf of Mexico, and South Atlantic: Caribbean coral... shrimp, Gulf coral, Gulf and South Atlantic coastal migratory pelagics, Gulf and South Atlantic spiny lobster, South Atlantic coral, South Atlantic snapper-grouper, South Atlantic shrimp, Atlantic dolphin...

  5. Gulf of Mexico Data Atlas: Digital Data Discovery and Access

    NASA Astrophysics Data System (ADS)

    Rose, K.

    2014-12-01

    The Gulf of Mexico Data Atlas is an online data discovery and access tool that allows users to browse a growing collection of ecosystem-related datasets visualized as map plates. Thematically, the Atlas includes updated long-term assessments of the physical, biological, environmental, economic and living marine resource characteristics that indicate baseline conditions of the Gulf of Mexico ecosystems. These data are crucial components of integrated ecosystem assessments and modeling and support restoration and monitoring efforts in the Gulf. A multi-agency executive steering committee including members from international, federal, state, and non-governmental organizations was established to guide Atlas development and to contribute data and expertise. The Atlas currently contains over 235 maps in 70 subject areas. Each map plate is accompanied by a descriptive summary authored by a subject matter expert and each data set is fully documented by metadata in Federal Geographic Data Committee (FGDC)-compliant standards. Source data are available in native formats and as web mapping services (WMS). Datasets are also searchable through an accompanying Map Catalog and RSS feed. The Gulf of Mexico Data Atlas is an operational example of the philosophy of leveraging resources among agencies and activities involved in geospatial data as outlined in the US Department of Interior and FGDC "Geospatial Platform Modernization Roadmap v4 - March 2011". We continue to update and add datasets through existing and new partnerships to ensure that the Atlas becomes a truly ecosystem-wide resource.

  6. Region-wide impairment of Atlantic croaker testicular development and sperm production in the northern Gulf of Mexico hypoxic dead zone.

    PubMed

    Thomas, Peter; Rahman, Md Saydur

    2010-01-01

    Recently evidence has been obtained for reproductive impairment in estuarine populations of Atlantic croaker exposed to seasonal hypoxia. However, it is not known whether a similar disruption of reproductive function occurs in croaker inhabiting a much larger hypoxic area, the extensive dead zone in coastal regions of the northern Gulf of Mexico extending from the Mississippi Delta to East Texas. Gonadal development in male Atlantic croaker collected in September 2008 at six sites in the dead zone was compared to that in male fish sampled from three reference sites east of the Mississippi Delta which do not experience persistent hypoxia. Croaker testes collected from the dead zone were at an earlier stage of spermatogenesis than those from the reference sites. Histological examination of the testes collected from the dead zone showed that their tubules had small lumens that contained very little sperm compared to the lumens of the reference fish. Overall, sperm production was 26.2% that of the control fish at the reference sites. This decrease in spermatogenesis at the dead zone sites was accompanied by an approximately 50% decrease in testicular growth compared to that in the reference fish. The results suggest that reproductive impairment can occur over regional scales in marine fish populations exposed to extensive seasonal hypoxia in dead zones with potential long-term impacts on population abundance. Copyright © 2009 Elsevier Ltd. All rights reserved.

  7. MAGSAT correlations with geoid anomalies. [magnetic anomalies in the western Gulf of Mexico

    NASA Technical Reports Server (NTRS)

    Bowin, C. O. (Principal Investigator)

    1984-01-01

    A digital data library of MAGSAT data is described and its applications and capabilities are reviewed. Polynomial trends were removed from each half-orbit in order to estimate and remove ring current effects from the data. The MAGSAT data in the Gulf of Mexico region was analyzed to define better the possible relation of the negative MAGSAT anomaly there to the negative residual geoid anomaly in the western Gulf of Mexico. Since the shape and location of the negative magnetic anomaly are variable depending upon the particular polynomial surface and curve orders used, no definitive conclusion as to the degree of correspondance between the residual geoid and MAGSAT lithosphere anomalies is offered.

  8. Interannual variation in summer N2O concentration in the hypoxic region of the northern Gulf of Mexico, 1985-2007

    NASA Astrophysics Data System (ADS)

    Kim, I.-N.; Lee, K.; Bange, H. W.; Macdonald, A. M.

    2013-04-01

    We present evidence of temporal variation in nitrous oxide (N2O) concentrations in the bottom waters of the northern Gulf of Mexico (nGOM) hypoxic zone. The analysis is based on a conceptual model simulating N2O biogeochemical processes in conjunction with water-column O2 levels, derived from summer Texas-Louisiana shelf-wide hydrographic data for twenty Julys between 1985 and 2007. The mean modeled nGOM N2O concentration was 7.7 ± 6.7 nmol L-1, and was significantly correlated with the areal extent of hypoxia. Our modeling analysis indicates that the nGOM is a persistent summer source of N2O, and nitrification is a primary factor leading to its production in this region. Based on the ongoing increase in the areal extent of hypoxia in the nGOM, we conclude that N2O emission from this environmentally stressed region will continue to increase into the future contributing to the global increase in greenhouse gases.

  9. Minimum extreme temperature in the gulf of mexico: is there a connection with solar activity?

    NASA Astrophysics Data System (ADS)

    Maravilla, D.; Mendoza, B.; Jauregui, E.

    Minimum extreme temperature ( MET) series from several meteorological stations of the Gulf of Mexico are spectrally analyzed using the Maximum Entrophy Method. We obtained periodicities similar to those found in the sunspot number, the magnetic solar cycle, comic ray fluxes and geomagnetic activity which are modulated by solar activity. We suggested that the solar signal is perhaps present in the MET record of this region of Mexico.

  10. Introduction to circulation in the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Sturges, W.; Lugo-Fernandez, A.; Shargel, M. D.

    The Gulf of Mexico is a jewel among the natural resources of the western hemisphere. Its wetlands are the source of an important seafood and shellfish industry. Offshore waters support rich commercial and sport fisheries. Its oil and gas resources are prime incentives for commercial development. Its glistening coastal beaches provide recreation to millions and are the economic backbone of numerous coastal communities. If we are to understand how to use and manage such resources, it is crucial that we understand the waters that flow in and through the Gulf.

  11. Strategies for gas hydrate exploration in the gulf of mexico

    NASA Astrophysics Data System (ADS)

    Johnson, A.; Dillon, W.; Max, M.

    2003-04-01

    Drilling results from Japan and the Canadian Arctic have demonstrated the potential for commercial production of natural gas from gas hydrate. Commercial gas hydrate methane production is likely within less than 10 years on a limited basis. A number of factors make the Gulf of Mexico (GOM) a significant area of interest for gas hydrate exploration. First, gas hydrate reaches its maximum concentrations in coarse clastics, and deposition in the GOM has provided for substantial amounts of sandy beds within the zone of hydrate stability. Second, the GOM has a high gas flux rate and an extensive system of migration paths, resulting in a high probability of multiple reservoirs with gas hydrate in the hydrate stability zone and gas deposits immediately below. Third, the existing infrastructure of platforms and pipelines improves the economics of hydrate development through the leveraging of existing facilities. Fourth, the GOM lies in a region of favorable political climate for exploitation of hydrocarbon deposits. Fifth, technology required for exploitation of gas hydrate is now emerging. Exploring for gas hydrates in the GOM requires the establishment of models for hydrate development and natural gas extraction. Ideally, such models integrate seismic, well log, and core data from throughout the subsurface hydrate stability zone. Unfortunately, few wells have been adequately logged in the hydrate stability zone interval in the Gulf and models are incomplete. Moreover, standard processing approaches for seismic data do not allow satisfactory assessment of hydrate occurrences. As a result, published models are presently derived mainly from piston core data and observations from submersibles. This near-seafloor information may be strongly misleading with respect to more deeply buried hydrate concentrations. The integration of a more stratigraphic approach to the Gulf's subsurface models and recognition of the importance of the hydrate cap could yield substantial new

  12. Estimating the Provision of Ecosystem Services by Gulf of Mexico Coastal Wetlands.

    EPA Science Inventory

    Gulf of Mexico (GOM) coastal wetlands contribute to human well-being by providing many ecosystem services (e.g., commercial and recreational fishery support, protection of coastal communities from storm surge, water quality improvement, and carbon sequestration). The GOM region c...

  13. Estimating the Provision of Ecosystem Services by Gulf of Mexico Coastal Wetlands.

    EPA Science Inventory

    Gulf of Mexico (GOM) coastal wetlands contribute to human well-being by providing many ecosystem services (e.g., commercial and recreational fishery support, protection of coastal communities from storm surge, water quality improvement, and carbon sequestration). The GOM region c...

  14. 76 FR 60807 - Gulf of Mexico Fishery Management Council; Public Meeting; Correction

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-09-30

    ... National Oceanic and Atmospheric Administration RIN 0648-XA720 Gulf of Mexico Fishery Management Council... Mexico Fishery Management Council will convene a meeting of the Reef Fish Advisory Panel (AP). DATES: The..., 2011. ADDRESSES: The meeting will be held at the Gulf of Mexico Fishery Management Council, 2203...

  15. Macro-ecology of Gulf of Mexico cold seeps.

    PubMed

    Cordes, Erik E; Bergquist, Derk C; Fisher, Charles R

    2009-01-01

    Shortly after the discovery of chemosynthetic ecosystems at deep-sea hydrothermal vents, similar ecosystems were found at cold seeps in the Gulf of Mexico. Over the past two decades, these sites have become model systems for understanding the physiology of the symbiont-containing megafauna and the ecology of seep communities worldwide. Symbiont-containing bi-valves and siboglinid polychaetes dominate the communities, including five bathymodiolin mussel species and six vestimentiferan (siboglinid polychaete) species in the Gulf of Mexico. The mussels include the first described examples of methanotrophic symbiosis and dual methanotrophic/thiotrophic symbiosis. Studies with the vestimentiferans have demonstrated their potential for extreme longevity and their ability to use posterior structures for subsurface exchange of dissolved metabolites. Ecological investigations have demonstrated that the vestimentiferans function as ecosystem engineers and identified a community succession sequence from a specialized high-biomass endemic community to a low-biomass community of background fauna over the life of a hydrocarbon seep site.

  16. Metagenomics of Water Column Microbes Near Brine Pool NR1 and adjacent regions of the Northern Gulf of Mexico Collected in Fall 2009

    NASA Astrophysics Data System (ADS)

    Wood, A. M.; Goodwin, K. D.; Brami, D.; Schwartz, A.; Toledo, G.

    2012-12-01

    High-throughput sequencing was applied to eight water column samples collected from the Gulf of Mexico in 2009 in regions SW and west of the 2010 Macondo oil spill. Samples were collected by Niskin-equipped CTD (~200 and ~650 m depths) at two locations, including a site over a methane brine pool (Brine Pool NR1). In addition, seawater was collected ~3m lateral of the pool (649m depth) via Niskin bottle equipped on the Johnson-Sea-Link submersible. Unassembled reads were submitted to the Synthetic Genomics bioinformatics pipeline for taxonomic analysis. The distribution of Bacteria (56-73%), Archae (7-16%), Eukaryotes (12-23%), and unclassified sequences (6-10%) were similar for all samples. However, certain taxonomic classifications were relatively more abundant in deeper samples, and differences were noted for samples collected by submersible. For example, Methylophaga was classified as 38% of the order Thiotrichales for the Niskin/submersible sample compared to 0% in the 200m-depth samples and 3-11% in the 650m samples. Methylophaga is a genus of indigenous methylotrophs reported to respond during the Deepwater Horizon event of 2010. In contrast, sequence abundance for Oceanospirillales, also reported to respond during the event, was similar for all samples (6-9% of the gamma-proteobacteria).

  17. 33 CFR 334.720 - Gulf of Mexico, south from Choctawhatchee Bay; Missile test area.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 33 Navigation and Navigable Waters 3 2014-07-01 2014-07-01 false Gulf of Mexico, south from... Mexico, south from Choctawhatchee Bay; Missile test area. (a) The danger zone. The danger zone shall... the Gulf of Mexico south from Choctawhatchee Bay within an area described as follows: Beginning at a...

  18. 33 CFR 334.720 - Gulf of Mexico, south from Choctawhatchee Bay; Missile test area.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 3 2012-07-01 2012-07-01 false Gulf of Mexico, south from... Mexico, south from Choctawhatchee Bay; Missile test area. (a) The danger zone. The danger zone shall... the Gulf of Mexico south from Choctawhatchee Bay within an area described as follows: Beginning at a...

  19. 33 CFR 334.720 - Gulf of Mexico, south from Choctawhatchee Bay; Missile test area.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 33 Navigation and Navigable Waters 3 2013-07-01 2013-07-01 false Gulf of Mexico, south from... Mexico, south from Choctawhatchee Bay; Missile test area. (a) The danger zone. The danger zone shall... the Gulf of Mexico south from Choctawhatchee Bay within an area described as follows: Beginning at a...

  20. 76 FR 80889 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-27

    ... National Oceanic and Atmospheric Administration RIN 0648-XA894 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Council to convene a public meeting. SUMMARY: The Gulf of Mexico Fishery... Mexico Fishery Management Council, 2203 North Lois Avenue, Suite 1100, Tampa, FL 33607; telephone:...

  1. Principles of pleistocene stratigraphy, applied to the Gulf of Mexico

    SciTech Connect

    Fillon, R.H.; Healy-Williams, N.; Ledbetter, M.T.; Thunell, R.C.; Williams, D.F.

    1984-01-01

    This study of one of the world's major oil provinces is an examination of advances made in the past decade in high resolution stratigraphy of Pleistocene marine sediments. Topics covered include magnetostratigraphy, planktonic foraminiferal biostratigraphy, oxygen isotope stratigraphy, tephrochronology and a review and updating of terrestrial-marine correlations during the Pleistocene. The emphasis is on the Gulf of Mexico, but the techniques described can be applied to other marine sedimentary basins.

  2. 33 CFR 166.200 - Shipping safety fairways and anchorage areas, Gulf of Mexico.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... the erection of structures therein to provide safe approaches through oil fields in the Gulf of Mexico...) Louisiana Offshore Oil Port (LOOP) Shipping Safety Fairway to Safety Zone—(i) North of Gulf Safety Fairway...

  3. 33 CFR 166.200 - Shipping safety fairways and anchorage areas, Gulf of Mexico.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... the erection of structures therein to provide safe approaches through oil fields in the Gulf of Mexico...) Louisiana Offshore Oil Port (LOOP) Shipping Safety Fairway to Safety Zone—(i) North of Gulf Safety Fairway...

  4. 33 CFR 166.200 - Shipping safety fairways and anchorage areas, Gulf of Mexico.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... the erection of structures therein to provide safe approaches through oil fields in the Gulf of Mexico...) Louisiana Offshore Oil Port (LOOP) Shipping Safety Fairway to Safety Zone—(i) North of Gulf Safety Fairway...

  5. 33 CFR 166.200 - Shipping safety fairways and anchorage areas, Gulf of Mexico.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... the erection of structures therein to provide safe approaches through oil fields in the Gulf of Mexico...) Louisiana Offshore Oil Port (LOOP) Shipping Safety Fairway to Safety Zone—(i) North of Gulf Safety Fairway...

  6. 33 CFR 166.200 - Shipping safety fairways and anchorage areas, Gulf of Mexico.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... the erection of structures therein to provide safe approaches through oil fields in the Gulf of Mexico...) Louisiana Offshore Oil Port (LOOP) Shipping Safety Fairway to Safety Zone—(i) North of Gulf Safety Fairway...

  7. 75 FR 4535 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); data workshop...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-01-28

    ... Atlantic and Gulf States Marine Fisheries Commissions have implemented the Southeast Data, Assessment and... Fisheries Southeast Regional Office and Southeast Fisheries Science Center. Participants include data... National Oceanic and Atmospheric Administration RIN 0648-XU07 Fisheries of the Gulf of Mexico;...

  8. Gulf of Mexico dissolved oxygen model (GoMDOM) research and quality assurance project plan

    EPA Science Inventory

    An integrated high resolution mathematical modeling framework is being developed that will link hydrodynamic, atmospheric, and water quality models for the northern Gulf of Mexico. This Research and Quality Assurance Project Plan primarily focuses on the deterministic Gulf of Me...

  9. Gulf of Mexico dissolved oxygen model (GoMDOM) research and quality assurance project plan

    EPA Science Inventory

    An integrated high resolution mathematical modeling framework is being developed that will link hydrodynamic, atmospheric, and water quality models for the northern Gulf of Mexico. This Research and Quality Assurance Project Plan primarily focuses on the deterministic Gulf of Me...

  10. Topographic Rossby waves in the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Hamilton, Peter

    2009-07-01

    Observations of topographic Rossby waves (TRW), using moored current meters, bottom pressure gauges, and Lagrangian RAFOS floats, are investigated for the deep basin of the Gulf of Mexico. Recent extensive measurement programs in many parts of the deep gulf, which were inspired by oil and gas industry explorations into ever deeper water, allow more comprehensive analyses of the propagation and dissipation of these deep planetary waves. The Gulf of Mexico circulation can be divided into two layers with the ∼800-1200 m upper layer being dominated by the Loop Current (LC) pulsations and shedding of large (diameters ∼300-400 km) anticyclonic eddies in the east, and the translation of these LC eddies across the basin to the west. These processes spawn smaller eddies of both signs through instabilities, and interactions with topography and other eddies to produce energetic surface layer flows that have a rich spectrum of orbit periods and diameters. In contrast, current variability below 1000 m often has the characteristics of TRWs, with periods ranging from ∼10-100 days and wavelengths of ∼50-200 km, showing almost depth-independent or slightly bottom intensified currents through the weakly stratified lower water column. These fluctuations are largely uncorrelated with simultaneous upper-layer eddy flows. TRWs must be generated through energy transfer from the upper-layer eddies to the lower layer by potential vorticity adjustments to changing depths of the bottom and the interface between the layers. Therefore, the LC and LC eddies are prime candidates as has been suggested by some model studies. Model simulations have also indicated that deep lower-layer eddies may be generated by the LC and LC eddy shedding processes. In the eastern gulf, the highest observed lower-layer kinetic energy was north of the Campeche Bank under the LC in a region that models have identified as having strong baroclinic instabilities. Part of the 60-day TRW signal propagates towards

  11. 75 FR 49883 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-08-16

    ...NMFS issues this proposed emergency rule to authorize the Regional Administrator, Southeast Region, NMFS (RA) to re-open the Gulf of Mexico (Gulf) recreational red snapper season after the September 30, 2010, end of the fishing season. Such a re-opening would only occur if NMFS determines that the recreational red snapper quota was not met by the 12:01 a.m., local time, July 24, 2010, closure date. Because of the Deepwater Horizon MC252 oil spill and the associated large-area fishery closure (fishery closed area) in the north-central Gulf, the Gulf of Mexico Fishery Management Council (Council) requested NMFS publish this proposed emergency rule. The Council does not expect the recreational quota will be reached by the closure date because the fishery closed area is located where a substantial portion of the recreational red snapper fishing effort occurs. The intent of this rulemaking is to provide fishermen the opportunity to harvest the recreational red snapper quota, and flexibility to achieve the optimum yield for the fishery, thus enhancing social and economic benefits to the fishery.

  12. A FRAMEWORK FOR AN INTEGRATED MONITORING PLAN FOR THE GULF OF MEXICO ECOSYSTEM

    EPA Science Inventory

    The Gulf of Mexico Program (GMP) Office in cooperation with its principal partners (Gulf State agencies, Federal agencies, private industry, etc.) and the Environmental Protection Agency's (EPA) Environmental Monitoring and Assessment Program (EMAP) are developing an integrated c...

  13. Digital archive of drilling mud weight pressures and wellbore temperatures from 49 regional cross sections of 967 well logs in Louisiana and Texas, onshore Gulf of Mexico basin

    USGS Publications Warehouse

    Burke, Lauri A.; Kinney, Scott A.; Kola-Kehinde, Temidayo B.

    2011-01-01

    This document provides the digital archive of in-situ temperature and drilling mud weight pressure data that were compiled from several historical sources. The data coverage includes the states of Texas and Louisiana in the Gulf of Mexico basin. Data are also provided graphically, for both Texas and Louisiana, as plots of temperature as a function of depth and pressure as a function of depth. The minimum, arithmetic average, and maximum values are tabulated for each 1,000-foot depth increment for temperature as well as pressure in the Texas and Louisiana data.

  14. Volatile organic compounds in Gulf of Mexico sediments

    SciTech Connect

    McDonald, T.J.

    1988-01-01

    Volatile organic compounds (VOC), concentrations and compositions were documented for estuarine, coastal, shelf, slope, and deep water sediments from the Gulf of Mexico. VOC were measured (detection limit >0.01 ppb) using a closed-loop stripping apparatus with gas chromatography (GC) and flame ionization, flame photometric, and mass spectrometric detectors. The five primary sources of Gulf of Mexico sediment VOC are: (1) planktonic and benthic fauna and flora; (2) terrestrial material from riverine and atmospheric deposition; (3) anthropogenic inputs: (4) upward migration of hydrocarbons; and (5) transport by bottom currents or slumping. Detected organo-sulfur compounds include alkylated sulfides, thiophene, alkylated thiophenes, and benzothiophenes. Benzothiophenes are petroleum related. Low molecular weight organo-sulfur compounds result from the biological oxidation of organic matter. A lack of organosulfur compounds in the reducing environment of the Orca Basin may result from a lack of free sulfides which are necessary for their production.

  15. Gulf of Mexico Helicopter Offshore System Technologies Recommended Development Path

    NASA Technical Reports Server (NTRS)

    Koenke, Edmund J.; Williams, Larry; Calafa, Caesar

    1999-01-01

    The National Aeronautics and Space Administration (NASA) Advanced Air Transportation Technologies (AATT) project in cooperation with the Department of Transportation (DOT) Volpe National Transportation Systems Center (VNTSC) contracted with the System Resources Corporation (SRC) for the evaluation of the existing environment and the identification of user and service provider needs in the Gulf of Mexico low-altitude Offshore Sector. The results of this contractor activity are reported in the Gulf of Mexico Helicopter Offshore System Technologies Engineering Needs Assessment. A recommended system design and transition strategy was then developed to satisfy the identified needs within the constraints of the environment. This work, also performed under contract to NASA, is the subject of this report.

  16. Gulf of Mexico Helicopter Offshore System Technologies Recommended Development Path

    NASA Technical Reports Server (NTRS)

    Koenke, Edmund J.; Williams, Larry; Calafa, Caesar

    1999-01-01

    The National Aeronautics and Space Administration (NASA) Advanced Air Transportation Technologies (AATT) project in cooperation with the Department of Transportation (DOT) Volpe National Transportation Systems Center (VNTSC) contracted with the System Resources Corporation (SRC) for the evaluation of the existing environment and the identification of user and service provider needs in the Gulf of Mexico low-altitude Offshore Sector. The results of this contractor activity are reported in the Gulf of Mexico Helicopter Offshore System Technologies Engineering Needs Assessment. A recommended system design and transition strategy was then developed to satisfy the identified needs within the constraints of the environment. This work, also performed under contract to NASA, is the subject of this report.

  17. Gulf of Mexico Air Quality: CALIPSO Support for Gulf of Mexico Air Quality Relating to the Deepwater Horizon Oil Spill

    NASA Technical Reports Server (NTRS)

    Nguyen, Myngoc T.; Lapointe, Stephen; Jennings, Brittney; Zoumplis, Angela

    2011-01-01

    On April 20, 2010, an oil platform belonging to BP exploded and leaked a huge volume of oil into the Gulf of Mexico. In an effort to control the spread of the oil, BP applied dispersants such as Corexit and conducted in-situ burnings of the oil. This catastrophe created a complex chain of events that affected not only the fragile water and land ecosystems, but the humans who breathe the air every day. Thousands of people were exposed to fumes associated with oil vapors from the spill, burning of the oil, and the toxic mixture of dispersants. While aiding in clean-up efforts, local fishermen were directly exposure to fumes when working on the Gulf. A notable amount of Gulf Coast residents were also exposed to the oil fumes as seasonal southeasterly winds blew vapors toward land. The Volatile Organic Compounds (VOC) found in oil vapors include: benzene, toluene, ethyl benzene, xylene, naphthalene, hydrogen sulfide and particulate matter (PM). Increases in water temperature and sunlight due to the summer season allow for these VOCs and PM to evaporate into the air more rapidly. Aside from the VOCs found in oil vapors, the dispersant being used to break up the oil is highly toxic and is thought to be even more toxic than the oil itself (EPA website, 2010). To protect human health, the environment, and to make informed policy decisions relevant to the spill, the EPA Region 6 has continuously monitored the affected areas carefully for levels of pollutants in the outdoor air that are associated with petroleum products and the burning of oil along the coast. In an effort to prevent, prepare for, and respond to future oil spills that occur in and around inland waters of the United States, the EPA has been working with local, state, and federal response partners. Air quality measurements were collected by the EPA at five active monitoring systems stationed along the coast.

  18. Patterns of the loop current system and regions of sea surface height variability in the eastern Gulf of Mexico revealed by the self-organizing maps

    NASA Astrophysics Data System (ADS)

    Liu, Yonggang; Weisberg, Robert H.; Vignudelli, Stefano; Mitchum, Gary T.

    2016-04-01

    The Self-Organizing Map (SOM), an unsupervised learning neural network, is employed to extract patterns evinced by the Loop Current (LC) system and to identify regions of sea surface height (SSH) variability in the eastern Gulf of Mexico (GoM) from 23 years (1993-2015) of altimetry data. Spatial patterns are characterized as different LC extensions and different stages in the process of LC eddy shedding. The temporal evolutions and the frequency of occurrences of these patterns are obtained, and the typical trajectories of the LC system progression on the SOM grid are investigated. For an elongated, northwest-extended, or west-positioned LC, it is common for the LC anticyclonic eddy (LCE) to separate and propagate into the western GoM, while an initially separated LCE in close proximity to the west Florida continental slope often reattaches to the LC and develops into an elongated LC, or reduces intensity locally before moving westward as a smaller eddy. Regions of differing SSH variations are also identified using the joint SOM-wavelet analysis. Along the general axis of the LC, SSH exhibits strong variability on time scales of 3 months to 2 years, also with energetic intraseasonal variations, which is consistent with the joint Empirical Orthogonal Function (EOF)-wavelet analysis. In the more peripheral regions, the SSH has a dominant seasonal variation that also projects across the coastal ocean. The SOM, when applied to both space and time domains of the same data, provides a powerful tool for diagnosing ocean processes from such different perspectives.

  19. Gulf of Mexico Integrated Science - Tampa Bay Study Overview

    USGS Publications Warehouse

    Yates, Kimberly

    2004-01-01

    The U.S. Geological Survey's Gulf of Mexico Integrated Science - Tampa Bay Study combines the expertise of federal, state, and local partners to address some of the most pressing ecological problems of the Tampa Bay estuary. This project serves as a template for integrated research projects in other coastal ecosystems in the nation. The Tampa Bay Study focuses on the scientific needs of the Bay, as identified by resource managers.

  20. Using potassium to stabilize Gulf of Mexico shales

    SciTech Connect

    Hemphill, T. )

    1989-11-01

    For many years, dispersed mud systems have predominated in the Gulf of Mexico. While these lignosulfonate systems generally have not promoted borehole stability, minimized shale hydration nor produced excellent caliper logs, they have provided acceptable rheological and filtration properties over a wide range of mud densities. Importantly, unlike nondispersed polymer muds, these lignosulfonate systems can withstand serious drill solids contamination, something that regularly occurs in the Gulf of Mexico drilling environment. The author describes a lignosulfonate system that replaces caustic soda with potassium hydroxide (KOH) and lignite with a potassium salt of humic acid has proved effective where conventional lignosulfonate systems have fallen short. Improved caliper logs and less clay hydration and dispersion occur where KOH and this K-LIG drilling fluid additive have been used.

  1. Oceanic Situational Awareness Over the Gulf of Mexico

    NASA Technical Reports Server (NTRS)

    Welch, Bryan; Greenfeld, Israel

    2005-01-01

    Air traffic control (ATC) mandated, aircraft separations over the oceans impose a limitation on traffic capacity for a given corridor, given the projected traffic growth over the Gulf of Mexico. The separations result from a lack of acceptable situational awareness over oceans where radar position updates are not available. This study considers the use of Automatic Dependent Surveillance (ADS) data transmitted over a commercial satellite communications system as an approach to provide ATC with the needed situational awareness and thusly allow for reduced aircraft separations. This study uses Federal Aviation Administration data from a single day for the Gulf of Mexico to analyze traffic loading to be used as a benchmark against which to compare several approaches for coordinating data transmissions from the aircraft to the satellites.

  2. An integrated approach to drilling in the Gulf of Mexico

    SciTech Connect

    Peery, M.D.; Bullock, R.D.

    1993-10-01

    This case history reviews the results of a single well and subsequent geological sidetrack drilled under an integrated partnering approach in East Cameron Block 306 of the Gulf of Mexico. The project demonstrates the benefits of partnering relationships. The integrated partnering approach proved to be an efficient and cost-effective means for the operator and service company to achieve objectives. The paper describes the operator, the drilling contractor, the service company, contract formats, project objectives, project summary, and conclusions.

  3. 76 FR 58783 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-09-22

    ... Avenue, Suite 1100, Tampa, FL 33607. FOR FURTHER INFORMATION CONTACT: Mr. Steven Atran, Population Dynamics Statistician; Gulf of Mexico Fishery Management Council; telephone: (813) 348-1630. SUPPLEMENTARY...

  4. 77 FR 75409 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-12-20

    ... Avenue, Suite 1100, Tampa, Florida 33607. FOR FURTHER INFORMATION CONTACT: Mr. Steven Atran, Population Dynamics Statistician and Dr. Carrie Simmons, Deputy Executive Director; Gulf of Mexico Fishery Management...

  5. Hydrocarbon flux from natural deepwater Gulf of Mexico vents

    NASA Astrophysics Data System (ADS)

    Flemings, P. B.; Smith, A. J.

    2012-12-01

    Natural vents that expel water and hydrocarbons are present on continental margins around the world. The expelled fluids support biological vent communities, escape to the ocean and atmosphere, and may contribute significantly to oceanic and atmospheric carbon budgets. We describe two vents in the northern Gulf of Mexico (GoM) at lease blocks MC852/853 and GB425 that have significant flow, high salinities, and elevated temperatures. We use a steady state multi-phase flow model and show that there is a unique water and hydrocarbon flux that simulates the observed salinity and temperature. We estimate the hydrocarbon flux at each vent to be 2.0-9.9x104 t yr-1 and 1.7-7.1x104 t yr-1, respectively. We extrapolate these results and estimate the hydrocarbon flux from the entire Gulf of Mexico to be 9.7-55x106 t yr-1. This flux is at least 50x greater than previous estimates11 and is 6-40% of the hydrocarbon flux from the Macondo oil spill. Large natural seepage may inoculate marine basins such as the Gulf of Mexico from oil spills like the 2010 Deepwater Horizon blowout by sustaining populations of hydrocarbon-degrading bacteria.

  6. 77 FR 59185 - Gulf of Mexico Citizen Advisory Committee; Notice of Charter Renewal

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-09-26

    ... Mexico. FOR FURTHER INFORMATION CONTACT: LaKeshia Robertson, Designated Federal Officer, Gulf of Mexico... robertson.lakeshia@epa.gov . Dated: September 18, 2012. Nancy K. Stoner, Acting Assistant...

  7. Integrated geological, geophysical, and geochemical interpretation of Upper Jurassic petroleum trends in eastern Gulf of Mexico

    SciTech Connect

    Mancini, E.A.; Mink, R.M.; Bearden, B.L.

    1986-09-01

    The petroleum potential of the Upper Jurassic strata in the eastern Gulf of Mexico region is excellent. At least three Upper Jurassic petroleum trends can be delineated in the region. An oil trend can be identified onshore in the area north of the regional peripheral fault trend and is interpreted to extend offshore into the area north of the Destin anticline in the eastern Gulf of Mexico. An oil and gas-condensate trend can be defined onshore between the regional peripheral fault trend and the Wiggins arch. This trend is projected to extend offshore into the area of the Destin anticline. A deep natural gas trend can be delineated onshore south of the Wiggins arch and extends offshore into the Mississippi-Alabama shelf area. These trends are recognized by hydrocarbon types, basinal position, and relationship to regional structural features. The main petroleum source rocks for the Upper Jurassic hydrocarbons are Smackover carbonate mudstones.

  8. 77 FR 70149 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-11-23

    ... 28 Gulf of Mexico Spanish mackerel and cobia assessment Webinar. SUMMARY: The SEDAR 28 assessment of the Gulf of Mexico Spanish mackerel and cobia fisheries will consist of a series of workshops...

  9. Regional Comparison of Detrital Zircon Populations in Syn-rift, Jurassic Rocks from the Northern Gulf of Mexico to Northern South America

    NASA Astrophysics Data System (ADS)

    Kouassi, M.

    2016-12-01

    We have compiled over 3200 detrital zircon ages in rock samples collected by various groups of previous workers that range in age from Cambrian to Cenozoic and cover the area of rifting between southern North America, Mexico, the Caribbean, and northern South America. We focussed this study on age populations in Jurassic sedimentary rocks from localities in the southern USA, Mexico, and Colombia to identify similar age populations that could constrain the relative locations of the various blocks during the period of Pangea's breakup and the formation of the Gulf of Mexico and Proto-Caribbean seaway. Jurassic samples from the Mixteca and Maya blocks of southern Mexico, the Norphlet Formation of Alabama and the Giron Formation of Eastern Cordillera of Colombia revealed a good correlation with correlative age populations of 900-1200 Ma and 200- 400 Ma. These results indicate that in a closed fit reconstruction all of these areas may have been overlain by common basin that covered the present-day area of the GOM, Yucatan block, and northern South America. We point out key areas for future sampling and dating that will help expand this study.

  10. 78 FR 15708 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-03-12

    ... Spanish mackerel and cobia Review Workshop. SUMMARY: The SEDAR 28 assessment of the Gulf of Mexico Spanish... recommendations with respect to the stock assessments of Gulf of Mexico Spanish mackerel and cobia. Although non...

  11. Storm Induced Injection of the Mississippi River Plume Into the Open Gulf of Mexico

    NASA Technical Reports Server (NTRS)

    Yuan, Jinchun; Miller, Richard L.; Powell, Rodney T.; Dagg, Michael J.

    2004-01-01

    The direct impact of the Mississippi River on the open Gulf of Mexico is typically considered to be limited due to the predominantly along-shore current pattern. Using satellite imagery, we analyzed chl a distributions in the northern Gulf of Mexico before and after the passage of two storms: Hurricane Lili and Tropical Storm Barry. Our analyses indicate that storm-induced eddies can rapidly inject large volumes of nutrient-rich Mississippi River water to the open gulf, and lead to phytoplankton blooms. Although these events last only a few weeks, they transport significant amounts of fluvial substances to the ocean. These river-ocean interactions are especially significant in tropical and subtropical regions because receiving waters are typically permanently stratified and oligotrophic.

  12. Ocean Atmosphere Flux Variability in the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Virmani, J. I.; Weisberg, R. H.

    2001-12-01

    Sea surface temperature within the Gulf of Mexico shows considerable spatial and temporal variability. Understanding causes of this variability is important because this region is a major source of moisture flux to the U.S. Heartlands. Some of this variability is due to ocean dynamics associated with coastal upwelling and the Loop Current, but an equally important amount is associated with local ocean-atmosphere fluxes. Many commonly available data sets such as COADS and NCEP reananlysis are unable to reproduce observed temporal and spatial variability due to coarse spatial resolution. This is a particular problem along the continental shelves and prevents the study of ocean-atmosphere interactions in these regions. In-situ measurements of oceanic and atmospheric parameters on the West Florida Shelf (WFS) allow us to describe the annual cycle of fluxes and how they interact with the underlying ocean circulation and mixed layer. Comparisons have also been made with NCEP reananlysis fields. Driving ocean models with the reanalysis fields, without flux corrections, fails to produce observed seasonally varying features on the WFS. Reconciling these differences and their impacts on the climate variability of this region provides challenges to models and their supporting observing systems.

  13. 75 FR 74650 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-12-01

    ... measures to reduce overfishing of gag in the Gulf of Mexico (Gulf). This final rule reduces the commercial... Management Council (Council). The intended effect of this final temporary rule is to reduce overfishing of... tilefish IFQ program. The purpose of this final temporary rule is to reduce overfishing of the gag...

  14. 77 FR 43049 - Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment and Review (SEDAR...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-07-23

    ... Webinar. SUMMARY: The SEDAR 28 assessment of the Gulf of Mexico and South Atlantic Spanish mackerel and... modeling methodologies for the Gulf of Mexico and South Atlantic Spanish mackerel and cobia fisheries...

  15. 78 FR 76107 - Fisheries of the South Atlantic and the Gulf of Mexico; South Atlantic Fishery Management Council...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-12-16

    ... National Oceanic and Atmospheric Administration Fisheries of the South Atlantic and the Gulf of Mexico; South Atlantic Fishery Management Council (SAFMC) and Gulf of Mexico Fishery Management Council (GMFMC); Public Meeting AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and...

  16. Interannual variation in summer N2O concentration in the hypoxic region of the northern Gulf of Mexico, 1985-2007

    NASA Astrophysics Data System (ADS)

    Kim, I.-N.; Lee, K.; Bange, H. W.; Macdonald, A. M.

    2013-11-01

    Microbial nitrous oxide (N2O) production in the ocean is enhanced under low-oxygen (O2) conditions. This is especially important in the context of increasing hypoxia (i.e., oceanic zones with extremely reduced O2 concentrations). Here, we present a study on the interannual variation in summertime nitrous oxide (N2O) concentrations in the bottom waters of the northern Gulf of Mexico (nGOM), which is well-known as the site of the second largest seasonally occurring hypoxic zone worldwide. To this end we developed a simple model that computes bottom-water N2O concentrations with a tri-linear ΔN2O/O2 relationship based on water-column O2 concentrations, derived from summer (July) Texas-Louisiana shelf-wide hydrographic data between 1985 and 2007. ΔN2O (i.e., excess N2O) was computed including nitrification and denitrification as the major microbial production and consumption pathways of N2O. The mean modeled bottom-water N2O concentration for July in the nGOM was 14.5 ± 2.3 nmol L-1 (min: 11.0 ± 4.5 nmol L-1 in 2000 and max: 20.6 ± 11.3 nmol L-1 in 2002). The mean bottom-water N2O concentrations were significantly correlated with the areal extent of hypoxia in the nGOM. Our modeling analysis indicates that the nGOM is a persistent summer source of N2O, and nitrification is dominating N2O production in this region. Based on the ongoing increase in the areal extent of hypoxia in the nGOM, we conclude that N2O production (and its subsequent emissions) from this environmentally stressed region will probably continue to increase into the future.

  17. 78 FR 33259 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-06-04

    ... (ACT), and reduces the geographic extent of the recreational shallow-water grouper (SWG) fixed seasonal closure. In the Gulf of Mexico (Gulf), SWG consists of gag, red grouper, black grouper, scamp, yellowfin... important reef fish species like red snapper and greater amberjack. Response: The Council considered...

  18. Regional diagenetic variations in Middle Pennsylvanian foreland basin sandstones of the southern Appalachians: Comparison to passive margin Cenozoic sandstones of the Gulf of Mexico

    SciTech Connect

    Milliken, K.L. . Dept. of Geological Science)

    1992-01-01

    Water/rock interactions recorded by authigenic phases in lithic-rich sandstones of the southern Appalachian basin, in the region of the Pine Mountain Overthrust (PMO), began with early post-depositional burial, extended through deeper burial and temperatures > 100 C during the Alleghenian orogeny, and continued through uplift and exposure at the modern weathering surface. Early-formed carbonate in the form of highly localized calcite concretions preserves IGVs greater than 30% and has widely ranging trace element concentrations. Later-formed calcite is characterized by relative low trace element concentrations in sandstones of low IGV. Precipitation of kaolinite cement and grain replacements partially overlapped formation of early carbonate and quartz cement. Dissolution and albitization of detrital feldspars are the primary types of grain alteration observed. Complete loss of the detrital feldspar assemblage is observed only around the eastern end of the PMO where a portion of the feldspar loss is recorded as quartz-replaced grains. Compaction due to ductile behavior of phyllosilicate-rich rock fragments and pressure solution of detrital quartz has reduced IGV to an average of around 11% below the PMO and 6% above the fault. In general, these foreland basin sandstones manifest authigenic phases and sequences of diagenetic events similar to those observed in the passive margin Gulf of Mexico sedimentary basin. The most striking diagenetic differences between the two basins are seen in terms of the comparative amounts of compaction (greater in the foreland basin) and grain alteration (less in the foreland basin) which most likely relate to primary differences in the texture and mineralogy of the sediments.

  19. 78 FR 74118 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR) Assessments of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-12-10

    ... National Oceanic and Atmospheric Administration RIN 0648-XD015 Fisheries of the Gulf of Mexico; Southeast... Atmospheric Administration (NOAA), Commerce. ACTION: Notice of SEDAR 33 Gulf of Mexico Gag and Greater Amberjack webinars. SUMMARY: The SEDAR 33 assessment of the Gulf of Mexico stocks of gag and...

  20. Properties of Sea Floor Hydrates From the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Bohrmann, G.; Klapp, S. A.; Abegg, F.; Kuhs, W. F.

    2007-05-01

    Near-surface methane hydrates are well known from numerous seep sites on active and passive continental margins. The hydrates exhibit a characteristic macroscopic and microscopic fabric as shown by samples recovered from a large range of water depths. In the Gulf of Mexico gas hydrates have been sampled from shallow northern slope in the Green Canyon area between 600 and 1000 m water depth and in the southern Gulf in 3300 m water depth. The internal fabric of pure gas hydrate has a peculiar structure with pores that result from rising methane gas. The porous gas hydrate structure could also be observed at the surface of gas hydrate outcrops in 3300 m water depth using ROV QUEST during METEOR cruise M67/2. Fabric analyses of hydrate samples indicate that at least parts of the hydrate are formed from free methane gas. Free gas migrates upwards through the sediment column and is also indicated by gas bubbles emanating at the seafloor. These bubbles form plumes in the water column. Gas hydrate decomposition and ice formation is also documented by cryo- stage X-ray diffraction and Rietveld analyses. Preservation of structure I hydrates various between 40-70% and has a average preservation of 60%. Preservation of structure II hydrates from the Gulf of Mexico is much better, which is explained by shallower stability curve of such hydrates.

  1. Impact of iodine chemistry on coastal ozone levels at the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Tuite, K.; Stutz, J.; Brockway, N.; Colosimo, S. F.; Tsai, J. Y.; Grossmann, K.; Alvarez, S. L.; Flynn, J. H., III; Erickson, M.; Caicedo, V.; Griffin, R. J.; Wallace, H. W., IV; Schulze, B.; Sheesley, R. J.; Usenko, S.; Yarwood, G.; Nopmongcol, U.

    2016-12-01

    Reactive iodine (Ix = I + IO) is known to destroy ozone through catalytic cycles in the marine boundary layer (MBL) and can thus have a significant impact on tropospheric ozone in coastal regions. As air quality standards for ozone become stricter, accurate background levels are increasingly important for the development of ozone reduction strategies. The Texas Gulf coast is an example for the significance of MBL background ozone, as onshore flows from the Gulf of Mexico contribute to the ozone levels in Houston and other coastal areas. The Gulf coast often experiences ozone mixing ratios below 20 ppb during summer onshore flow conditions, which are currently overestimated by regional and global air quality models. Modeling with the Comprehensive Air quality Model with extensions (CAMx) and GEOS-Chem including halogen chemistry identified iodine emissions from the Gulf of Mexico as a possible explanation. However, ambient measurements of Ix species for the Gulf of Mexico are needed to test this hypothesis and, if confirmed, refine models. We measured IO, O3, and other trace gases at the Gulf coast near Galveston, TX, using UCLA's long path DOAS instrument and a suite of in-situ instruments. During the study period from May 15 through July 12, 2016, several multi-day events with MBL ozone levels below 20 ppb were encountered. Here we present the observational data with a focus on time periods with onshore flow from the Gulf. A chemical steady state analysis will be used to assess whether the observed Ix mixing ratios can explain these low ozone mixing ratios. Our results will be compared to the CAMx and GEOS-Chem model simulations.

  2. 76 FR 43685 - Designation of an Ocean Dredged Material Disposal Site (ODMDS) in the Gulf of Mexico Off the...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-21

    ... AGENCY Designation of an Ocean Dredged Material Disposal Site (ODMDS) in the Gulf of Mexico Off the Mouth... of an ODMDS in the Gulf of Mexico off the mouth of the Atchafalaya River, St. Mary Parish, LA... the designation of an ODMDS in the Gulf of Mexico off the mouth of the Atchafalaya River, St. Mary...

  3. THE MAY 23TH 2007 GULF OF MEXICO EARTHQUAKE

    NASA Astrophysics Data System (ADS)

    Yamamoto, J.; Jimenez, Z.

    2009-12-01

    On the 23th of May 2007 at 14:09 local time (19:09 UT) an insolated earthquake of local magnitude 5.2 occurred offshore northern Veracruz in the Gulf of Mexico. The seismic focus was located using local and regional data at 20.11° N, 97.38° W and 7.8 km depth at 175 km distance from Tuxpan a city of 134,394 inhabitants. The earthquake was widely felt along the costal states of southern Tamaulipas and Veracruz in which several schools and public buildings were evacuated. Neither Laguna Verde nuclear plant, located approximately 245 km from the epicenter, nor PEMEX petroleum company reported damage. First-motion data indicates that the rupture occurred as strike slip faulting along two possible planes, one oriented roughly north-south and the other east-west. In the present paper a global analysis of the earthquake is made to elucidate its origin and possible correlation with known geotectonic features of the region.

  4. Comparison of Gulf of Mexico Wave Information Studies (WIS) 2-G Hindcast with 3-G Hindcasting

    DTIC Science & Technology

    2006-01-01

    recently completed twenty years (1980-1999) of wave hindcasts for the Gulf of Mexico using the second-generation wave model, WISWAVE. This wave...of three hindcasts using the same input wind fields and the same nested grid system. Results will be shown at available measurement sites for the 1995 Level 2 and Level 3 Gulf of Mexico hindcast.

  5. 77 FR 60967 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment and Review (SEDAR); Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-05

    ... and Atmospheric Administration (NOAA), Commerce. ] ACTION: Notice of SEDAR 28 Gulf of Mexico Spanish mackerel and cobia assessment webinars. SUMMARY: The SEDAR 28 assessment of the Gulf of Mexico Spanish... continue deliberations and discussions regarding modeling methodologies for the Gulf of Mexico Spanish...

  6. 49 CFR 195.413 - Underwater inspection and reburial of pipelines in the Gulf of Mexico and its inlets.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... the Gulf of Mexico and its inlets. 195.413 Section 195.413 Transportation Other Regulations Relating... Maintenance § 195.413 Underwater inspection and reburial of pipelines in the Gulf of Mexico and its inlets. (a... shall prepare and follow a procedure to identify its pipelines in the Gulf of Mexico and its inlets in...

  7. 49 CFR 195.413 - Underwater inspection and reburial of pipelines in the Gulf of Mexico and its inlets.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... the Gulf of Mexico and its inlets. 195.413 Section 195.413 Transportation Other Regulations Relating... Maintenance § 195.413 Underwater inspection and reburial of pipelines in the Gulf of Mexico and its inlets. (a... shall prepare and follow a procedure to identify its pipelines in the Gulf of Mexico and its inlets in...

  8. 49 CFR 195.413 - Underwater inspection and reburial of pipelines in the Gulf of Mexico and its inlets.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... the Gulf of Mexico and its inlets. 195.413 Section 195.413 Transportation Other Regulations Relating... Maintenance § 195.413 Underwater inspection and reburial of pipelines in the Gulf of Mexico and its inlets. (a... shall prepare and follow a procedure to identify its pipelines in the Gulf of Mexico and its inlets in...

  9. 49 CFR 195.413 - Underwater inspection and reburial of pipelines in the Gulf of Mexico and its inlets.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... the Gulf of Mexico and its inlets. 195.413 Section 195.413 Transportation Other Regulations Relating... Maintenance § 195.413 Underwater inspection and reburial of pipelines in the Gulf of Mexico and its inlets. (a... shall prepare and follow a procedure to identify its pipelines in the Gulf of Mexico and its inlets in...

  10. 49 CFR 195.413 - Underwater inspection and reburial of pipelines in the Gulf of Mexico and its inlets.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... the Gulf of Mexico and its inlets. 195.413 Section 195.413 Transportation Other Regulations Relating... Maintenance § 195.413 Underwater inspection and reburial of pipelines in the Gulf of Mexico and its inlets. (a... shall prepare and follow a procedure to identify its pipelines in the Gulf of Mexico and its inlets in...

  11. 75 FR 59226 - Fisheries of the South Atlantic, Gulf of Mexico, and Caribbean; Southeastern Data, Assessment...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-27

    ... the Gulf States Marine Fisheries Commission; implemented the Southeast Data, Assessment and Review... National Oceanic and Atmospheric Administration RIN 0648-XZ25 Fisheries of the South Atlantic, Gulf of...) 769-4520. SUPPLEMENTARY INFORMATION: The South Atlantic, Gulf of Mexico, and Caribbean...

  12. 76 FR 50719 - Fisheries of the South Atlantic, Gulf of Mexico, and Caribbean; Southeastern Data, Assessment...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-08-16

    ... Fisheries Commission, and the Gulf States Marine Fisheries Commission; implemented the Southeast Data... National Oceanic and Atmospheric Administration RIN 0648-XA639 Fisheries of the South Atlantic, Gulf of... (866) SAFMC-10; fax: (843) 769-4520. SUPPLEMENTARY INFORMATION: The South Atlantic, Gulf of Mexico,...

  13. Megafauna community composition associated with Lophelia pertusa colonies in the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Lessard-Pilon, Stephanie A.; Podowski, Elizabeth L.; Cordes, Erik E.; Fisher, Charles R.

    2010-11-01

    The deep-water coral Lophelia pertusa provides habitat for diverse communities in the Gulf of Mexico. Photomosaics and analyses within a Geographic Information System (GIS) were used as non-destructive sampling tools to examine megafauna community composition associated with L. pertusa colonies on authigenic carbonate outcrops in two regions of the Gulf of Mexico. Megafauna communities associated with L. pertusa were more similar within a region than between regions. Within regions, the amount of dead coral, number of abiotic and biotic substrata, and percentage of live L. pertusa influenced the diversity, composition, and structure of the coral-associated communities. Elevated diversity levels in the communities associated with L. pertusa structure indicate that L. pertusa provides a distinct, localized habitat source. Outcrops with high proportions of dead L. pertusa harbored more higher order consumers than outcrops with primarily live coral framework.

  14. Gulf of Mexico hypoxia: exploring increasing sensitivity to nitrogen loads.

    PubMed

    Liu, Yong; Evans, Mary Anne; Scavia, Donald

    2010-08-01

    Hypoxia is a critical issue in the Gulf of Mexico that has challenged management efforts in recent years by an increase in hypoxia sensitivity to nitrogen loads. Several mechanisms have been proposed to explain the recent increase in sensitivity. Two commonly cited mechanisms are bottom-water reducing conditions preventing nitrification and thus denitrification, leading to more N recycling and production of oxygen-consuming organic matter, and carryover of organic matter from previous years increasing oxygen demand, making the system more sensitive. We use models informed by these mechanisms and fit with Bayesian inference to explore changes in Gulf of Mexico hypoxia sensitivity. We show that a model including an annually fit parameter representing variation in the fraction of nutrient loading and recycling contributing to bottom water oxygen demand provides a good fit to observations and is not improved by explicit inclusion of organic matter carryover to subsequent years. Both models support two stepwise increases in system sensitivity during the period of record. This change in sensitivity has greatly increased the nutrient reduction needed to achieve the established hypoxia goal. If the Gulf remains at the current state of sensitivity, our analysis suggests a roughly 70% reduction of spring TN loads from the 1988-1996 average of 6083 ton/day may be required.

  15. Radiocarbon-derived sedimentation rates in the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Santschi, Peter H.; Rowe, Gilbert T.

    2008-12-01

    Sedimentation rates were determined for the northern Gulf of Mexico margin sediments at water depths ranging from 770 to 3560 m, using radiocarbon determinations of organic matter. Resulting sedimentation rates ranged from 3 to 15 cm/kyr, decreasing with increasing water depth. These rates agree with long-term sedimentation rates estimated previously using stratigraphic methods, and with estimates of sediment delivery rates by the Mississippi River to the northern Gulf of Mexico, but are generally higher by 1-2 orders of magnitude than those estimated by 210Pb xs methods. Near-surface slope sediments from 2737 m water depth in the Mississippi River fan were much older than the rest. They had minimum 14C ages of 16-27 kyr and δ13C values ranging from -24‰ to -26.5‰, indicating a terrestrial origin of organic matter. The sediments from this site were thus likely deposited by episodic mass wasting of slope sediment through the canyon, delineating the previously suggested main pathway of sediment and clay movement to abyssal Gulf sediments.

  16. Seismic stratigraphy of shelf and slope, northeastern Gulf of Mexico

    SciTech Connect

    Addy, S.K.; Buffler, R.T.

    1984-11-01

    A seismic stratigraphic framework of the shelf in the northeastern Gulf of Mexico near Destin dome is established by correlating multifold seismic lines with deep wells that penetrate to the Middle Jurassic Louann Salt and with a previously published seismic stratigraphic study based on shallow core holes. Nine depositional sequences or seismic units are recognized and are designated A through I in the order of increasing age. During the Middle Jurassic to middle Cretaceous, shallow-water deposition prevailed in the area. This deposition was followed by a period of general transgression until middle Oligocene, during which deeper water deposition took place. After the middle Oligocene, a shallow-water regime returned to the area. Thinning of seismic units and onlap of reflectors of post-middle Cretaceous age on the Destin dome suggest that the dome was uplifted in Late Cretaceous and into the early Tertiary. Six previously established seismic stratigraphic units from the deep Gulf of Mexico are traced into the lower slope near De Soto Canyon. Although several units thin and pinch out, two key boundaries can be traced onto the shelf. The important Challenger-Campeche boundary, which is recognized as a marker horizon and unconformity throughout the abyssal Gulf, is correlated to the F-E boundary, the middle Cretaceous (97 Ma) unconformity on the shelf. The base of the Sigsbee-Cinco de Mayo unit is correlated to an 8-Ma reflector on the shelf. These correlations confirm previous age estimates for the deep Gulf units. Absence of coherent reflections in the Lower Cretaceous carbonate margin indicates possible reef growth. This margin is the southeastward subsurface extension of the Stuart City reef trend in Texas and Louisiana. This trend extends farther to the southeast where the carbonate margin crops out along the Florida Escarpment.

  17. 76 FR 56659 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Coastal Migratory Pelagic...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-09-14

    ... Gulf of Mexico (Gulf) to commercial king mackerel fishing in the exclusive economic zone (EEZ). This closure is necessary to protect the Gulf king mackerel resource. DATES: The closure is effective noon... INFORMATION: The fishery for coastal migratory pelagic fish (king mackerel, Spanish mackerel, cero,...

  18. 76 FR 7118 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Coastal Migratory Pelagic...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-02-09

    ... Gulf of Mexico (Gulf) to commercial king mackerel fishing in the exclusive economic zone (EEZ). This closure is necessary to protect the Gulf king mackerel resource. DATES: The closure is effective noon... INFORMATION: The fishery for coastal migratory pelagic fish (king mackerel, Spanish mackerel, cero,...

  19. Vertical structure of the mesoscale eddies in the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Sosa Gutiérrez, E. R.; Pallas Sanz, E.; Chaigneau, A.; Candela, J.

    2016-02-01

    The vertical structure of the anticyclonic and cyclonic eddies ubiquitous in the Gulf of Mexico is obtained using a combination of altimetry imagery and observations of 32 moorings of the CANEK group during the period of 2007-2012. Eddy composites are constructed in two regions: The Loop Current system (eddy generation region) and the western Gulf of Mexico (eddy dissipation region). We found different thermohaline and cinematic vertical structures in the eddies of both regions of study. The temperature (T'), salinity (S'), and speed (|u'h|) anomalies in the core of anticyclonic eddies of the eastern Gulf are located at z≃-180 m, z≃-250 m, and z≃-70 m respectively, whose maximum values are of +2.9oC, +0.3 ppm, and |u'h|≃0.52 m s-1, respectively. In contrast, the anticyclonic eddies in the western Gulf of Mexico have maximum anomalies of +2.4oC, +0.24 ppm, and \\in [0.14-0.24] m s-1 located at z≃-180 m, z≃-350 m, and z≃-70 m, respectively. These differences are explained by the fact that the waters of Caribbean origin are transformed into common Gulf waters during the propagation of these eddies to the western Gulf of Mexico; and the decrease of speed is attributed to eddy-eddy and/or eddy-shelf interactions. The thermohaline and cinematic composites of the cyclonic eddies in both regions of study are also contrasting. The cyclones in the region of the Loop Current have intense anomalies of -7.5oC (T'), -0.95 ppm (S') and |u'h|≃0.52 m s-1 (|u'h|) located at z≃-180 m, z≃-300 m, and z≃-70 m, respectively. These anomalies are ˜3 times smaller in the cyclones ubiquitous in the western region. These differences are related with the different mechanisms of cyclonic eddy generation of each region, and the water masses that these eddies trap during its genesis. In general we observe that mesoscale eddies in the Loop Current are larger, with larger vertical extension, saltier, colder, and with higher speeds than the eddies of the western Gulf.

  20. Feldspar diagenesis in Neogene sediments, northern Gulf of Mexico

    SciTech Connect

    Milliken, K.L.; Gold, P.B.; Land, L.S.

    1985-02-01

    Alteration of feldspars in the youngest of the Gulf Coast Cenozoic sands and sandstones is dominated by dissolution and albitization. Volumetrically significant amounts of alteration are only observed below burial depths of about 4.5 km in sands of Pliocene and Miocene age. Only trivial amounts of plagioclase dissolution were observed in Pleistocene units. In general, plagioclase exhibits minor amounts of secondary dissolution at all depths, and greater among in the deepest samples. Potassium feldspar is subject to very little dissolution to depths of about 3.5 km; by 4.5 km K-feldspar removal is virtually complete. Albitization affects only plagioclase and appears to be operative, in these sediments, over temperatures of 110/sup 0/C-140/sup 0/C. Compared to older Cenozoic units elsewhere around the Gulf of Mexico feldspar dissolution and albitization in Neogene sands have advanced to a lesser degree, at least in the sense that they affect a smaller proportion of the total section. Comparison of pre-alteration feldspar composition, temperatures of alteration, and geothermal gradients for Gulf Coast sandstones of different ages suggests that the main controls on feldspar alteration are temperature, pre-alteration plagioclase composition, and possibly the amount of fluid flow. Time per se seems to be a factor of negligible importance, at least over time spans greater than 10/sup 6/ yr. Thus, the lesser volume of Neogene sand affected by feldspar dissolution and albitization can be attributed primarily to the lower geothermal gradients of the northern Gulf.

  1. 33 CFR 334.710 - The Narrows and Gulf of Mexico adjacent to Santa Rosa Island, Headquarters Air Armament Center...

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 33 Navigation and Navigable Waters 3 2014-07-01 2014-07-01 false The Narrows and Gulf of Mexico... DEFENSE DANGER ZONE AND RESTRICTED AREA REGULATIONS § 334.710 The Narrows and Gulf of Mexico adjacent to... part 329, including the waters of The Narrows and the Gulf of Mexico easterly of the periphery of a...

  2. 33 CFR 334.710 - The Narrows and Gulf of Mexico adjacent to Santa Rosa Island, Headquarters Air Armament Center...

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 33 Navigation and Navigable Waters 3 2013-07-01 2013-07-01 false The Narrows and Gulf of Mexico... DEFENSE DANGER ZONE AND RESTRICTED AREA REGULATIONS § 334.710 The Narrows and Gulf of Mexico adjacent to... part 329, including the waters of The Narrows and the Gulf of Mexico easterly of the periphery of a...

  3. 33 CFR 334.710 - The Narrows and Gulf of Mexico adjacent to Santa Rosa Island, Headquarters Air Armament Center...

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 3 2012-07-01 2012-07-01 false The Narrows and Gulf of Mexico... DEFENSE DANGER ZONE AND RESTRICTED AREA REGULATIONS § 334.710 The Narrows and Gulf of Mexico adjacent to... part 329, including the waters of The Narrows and the Gulf of Mexico easterly of the periphery of a...

  4. The origins of petroleum in the northern Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Kennicutt, M. C., II; McDonald, T. J.; Comet, P. A.; Denoux, G. J.; Brooks, J. M.

    1992-03-01

    The distribution and chemistry of oils in the northern Gulf of Mexico and the adjacent onshore can be explained by multiple sources, fades variations, maturation, and post-generation alteration. Genetic families include Jurassic Smackover, Flexure Trend, Upper Cretaceous, and Paleogene oils. Smackover oils have high sulfur contents, pristane/phytane ratios < 1.0, CPI < 1.0, abundant extended hopanes, C 35/C 34 hopane ratios ≥1.0, and C 30/C 29 hopane ratios usuall ≤ 1.0. Flexure Trend oils are similar and contain abundant extended hopanes, high sulfur contents, and V/(Ni + V) > 0.5; these oils are inferred to be sourced in Upper Jurassic/Lower Cretaceous strata. Upper Cretaceous oils contain a distinctive suite of tricyclic and nonhopanoid triterpanes; oleanane is low or absent. Paleogene oils can be recognized by the presence of 18α(H) oleanane and a lack of extended hopanes. These oils occur from south Texas to southern and offshore Louisiana. Two subfamilies can be recognized based on the relative abundance of triterpanes and steranes. These oils have a presumed Paleogene source. Mixing of oil types is quite prevalent at the geographic boundaries of oil types. The initial control on the distribution of oil and gas in the northern Gulf of Mexico is provided by the areal extent of source rocks. Secondary control is due to Cenozoic deposition, which provides the thermal stress to generate, as well as destroy, oil. Salt tectonics provide conduits for migrating fluids to escape the zone of thermal destruction. Mesozoic source strata again become important in the deep Gulf of Mexico, where Cenozoic sediments thin.

  5. 33 CFR 334.763 - Naval Support Activity Panama City; Gulf of Mexico; restricted area.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... City; Gulf of Mexico; restricted area. 334.763 Section 334.763 Navigation and Navigable Waters CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY, DEPARTMENT OF DEFENSE DANGER ZONE AND RESTRICTED AREA REGULATIONS § 334.763 Naval Support Activity Panama City; Gulf of Mexico; restricted area. (a) The area. The area is...

  6. 33 CFR 334.763 - Naval Support Activity Panama City; Gulf of Mexico; restricted area.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... City; Gulf of Mexico; restricted area. 334.763 Section 334.763 Navigation and Navigable Waters CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY, DEPARTMENT OF DEFENSE DANGER ZONE AND RESTRICTED AREA REGULATIONS § 334.763 Naval Support Activity Panama City; Gulf of Mexico; restricted area. (a) The area. The area is...

  7. Revisiting the Mesozoic opening of the Southeastern Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Marton, G.; Pascoe, R. P.

    2016-12-01

    The Southeastern Gulf of Mexico (SEGOM) is defined here as the seaway between Yucatan and Florida, south of the Tampa Embayment. This area is regarded as a southward propagating rift in the Gulf of Mexico. There is an overwhelming amount of previous evidence that the Yucatan block rotated counterclockwise about 42 degrees around a pole located just north of present-day Cuba (23oN, 84oW) during the Late Jurassic to Earliest Cretaceous oceanic spreading phase. North of the pole in the SEGOM the rotational movement of Yucatan was accommodated by a uniformly increasing amount of SW-NE extension. The degree of extension north of 25oN was large enough to result in rifting and oceanic spreading. Lack of salt in the area south of the Tampa embayment indicates that the SEGOM was not affected by the large amount of NW-SE continental extension as observed in the rest of the Gulf of Mexico. Thus, the area between Yucatan and the Sarasota arch remained a land bridge between the proto- GOM and the Proto-Caribbean and formed a barrier to salt deposition. During the period of late Jurassic oceanic crust formation (and Yucatan rotation), the southern tip of the oceanic spreading center propagated south from 27oN to 25oN, or about 220 km. In the 220 km long zone from 25oN to the pole (23oN) the rotation of Yucatan was accommodated by continental rifting only. The validity of the above outlined propagating rift model in the SEGOM is also supported by the age differences in the observed post-rift unconformities along its margins. At the edge of the salt basin to the north, the post-rift unconformity in the upper crust occurs at the base of the Louann salt and thus is Callovian in age. In the southern continental rift segment of the SEGOM, a seismic to well tie at the DSDP Site 535 shows that the post-rift unconformity is no younger than Late Berriasian to Early Valanginian. This latter age bracket constrains a) the cessation of continental rifting in the SEGOM, b) the time when the

  8. Reducing hypoxia in the Gulf of Mexico – an alternative approach

    USDA-ARS?s Scientific Manuscript database

    Hypoxia in the Gulf of Mexico is a high-priority national issue. Agricultural nonpoint source pollution is the greatest source of water pollution today and its consequences are particularly evident in the Gulf of Mexico. For example, Illinois, Iowa and Indiana together contribute nearly 30% of the p...

  9. 75 FR 19941 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-16

    ... National Oceanic and Atmospheric Administration RIN 0648-XV87 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of public meeting. SUMMARY: The Gulf of Mexico Fishery Management Council will convene a public meeting of its Outreach and Education Advisory Panel (AP). DATES:...

  10. 75 FR 80041 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-12-21

    ... National Oceanic and Atmospheric Administration RIN 0648-XA098 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of public meeting. SUMMARY: The Gulf of Mexico Fishery Management Council will convene a public meeting of the Outreach and Education Advisory Panel (AP). DATES:...

  11. 78 FR 69649 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-11-20

    ... National Oceanic and Atmospheric Administration RIN 0648-XC992 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of a public meeting. SUMMARY: The Gulf of Mexico Fishery Management Council (Council) will hold a Webinar of the Outreach and Education Advisory Panel. DATES:...

  12. 75 FR 41818 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-19

    ... National Oceanic and Atmospheric Administration RIN: 0648-XX59 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of public meeting. SUMMARY: The Gulf of Mexico Fishery Management Council will convene a public meeting of the Outreach and Education Advisory Panel (AP). DATES:...

  13. 78 FR 29116 - Gulf of Mexico Fishery Management Council; Public Meeting; Correction

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-17

    ... National Oceanic and Atmospheric Administration RIN 0648-XC680 Gulf of Mexico Fishery Management Council...: The Gulf of Mexico Fishery Management Council will convene a meeting of the Standing, Special Mackerel and Special Reef Fish Scientific and Statistical Committees. DATES: The meeting will convene at 8:30 a...

  14. 78 FR 27365 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-10

    ... Management Council will convene a meeting of the Standing, Special Mackerel and Ecosystem Scientific and... National Oceanic and Atmospheric Administration RIN 0648-XC680 Gulf of Mexico Fishery Management Council... address: Gulf of Mexico Fishery Management Council, 2203 N. Lois Avenue, Suite 1100, Tampa, FL 33607. FOR...

  15. 77 FR 76473 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-12-28

    ... Fishery Management Council (Council) will convene the Socioeconomic Scientific and Statistical Committee...-XC418 Gulf of Mexico Fishery Management Council; Public Meeting AGENCY: National Marine Fisheries... convene a public meeting. SUMMARY: The Gulf of Mexico Fishery Management Council will convene a meeting of...

  16. 33 CFR 334.763 - Naval Support Activity Panama City; Gulf of Mexico; restricted area.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 33 Navigation and Navigable Waters 3 2011-07-01 2011-07-01 false Naval Support Activity Panama City; Gulf of Mexico; restricted area. 334.763 Section 334.763 Navigation and Navigable Waters CORPS OF....763 Naval Support Activity Panama City; Gulf of Mexico; restricted area. (a) The area. The area is...

  17. 33 CFR 334.763 - Naval Support Activity Panama City; Gulf of Mexico; restricted area.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 33 Navigation and Navigable Waters 3 2014-07-01 2014-07-01 false Naval Support Activity Panama City; Gulf of Mexico; restricted area. 334.763 Section 334.763 Navigation and Navigable Waters CORPS OF....763 Naval Support Activity Panama City; Gulf of Mexico; restricted area. (a) The area. The area is...

  18. 33 CFR 334.763 - Naval Support Activity Panama City; Gulf of Mexico; restricted area.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Naval Support Activity Panama City; Gulf of Mexico; restricted area. 334.763 Section 334.763 Navigation and Navigable Waters CORPS OF....763 Naval Support Activity Panama City; Gulf of Mexico; restricted area. (a) The area. The area is...

  19. 76 FR 41765 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-15

    ... National Oceanic and Atmospheric Administration RIN 0648-XA570 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Council to convene a public meeting. SUMMARY: The Gulf of Mexico Fishery Management Council will convene a meeting of the Outreach and Education Advisory Panel. DATES: The...

  20. 78 FR 38951 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-06-28

    ... National Oceanic and Atmospheric Administration RIN 0648-XC735 Gulf of Mexico Fishery Management Council; Public Meeting AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce. ACTION: Notice of a public meeting. SUMMARY: The Gulf of Mexico...

  1. 77 FR 4282 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-01-27

    ... Management Council will convene a meeting of the Shrimp Stock Assessment Workshop. DATES: The meeting will... National Oceanic and Atmospheric Administration RIN 0648-XA962 Gulf of Mexico Fishery Management Council... 77551-5997. Council address: Gulf of Mexico Fishery Management Council, 2203 N. Lois Avenue, Suite...

  2. 77 FR 40859 - Gulf of Mexico Fishery Management Council; Public Meetings; Correction

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-07-11

    ... Council (Council) will convene the Law Enforcement Advisory Panel (LEAP) along with the Gulf States Marine... Enforcement Advisory Panel consists of principal law enforcement officers in each of the Gulf States, as well... National Oceanic and Atmospheric Administration Gulf of Mexico Fishery Management Council; Public...

  3. Parameterization of Submesoscale Particle Transport in the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Haza, A. C.; Ozgokmen, T. M.; Griffa, A.; Poje, A. C.; Hogan, P. J.; Jacobs, G. A.

    2014-12-01

    Submesoscale flows have a significant impact on the transport at their own scales, yet require extensive data sets and numerical computations, making them challenging to approach deterministically. A recent Lagrangian parametrization to correct particle transport at the submesoscales is implemented to an eddy permitting ocean model at 1/25 degree grid for the surface circulation of the Gulf of Mexico. It combines mesoscale transport from the deterministic Lagrangian Coherent Structures (LCS) and statistical Lagrangian subgridscale (LSGS) models over the submesoscale range. Comparison to a 1km submesoscale-permitting ocean model shows a significant improvement of the scale-dependent relative dispersion and particle distribution.

  4. Lessons learned from a one-dimensional water quality model for the Gulf of Mexico

    EPA Science Inventory

    Hypoxia in the northern Gulf of Mexico has been a major concern for many years. Several water quality models have attempted to describe the link between high nutrient loads from the Mississippi River and hypoxia in the Gulf of Mexico with varied success. Here we describe the dev...

  5. 76 FR 41766 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-15

    ... National Oceanic and Atmospheric Administration RIN 0648-XA569 Gulf of Mexico Fishery Management Council... Management Council will convene public hearings on: Amendment 18 to the Fishery Management Plan for Coastal... Management Plan in the Gulf of Mexico. DATES: The public meetings will be held on August 1, 2011...

  6. 78 FR 57840 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-09-20

    ... National Oceanic and Atmospheric Administration RIN 0648-XC879 Gulf of Mexico Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice; public meetings. SUMMARY: The Gulf of Mexico Fishery Management... Fish Scientific and Statistical Committees (SSC). DATES: The meetings will be held from 1 p.m. on...

  7. Lessons learned from a one-dimensional water quality model for the Gulf of Mexico

    EPA Science Inventory

    Hypoxia in the northern Gulf of Mexico has been a major concern for many years. Several water quality models have attempted to describe the link between high nutrient loads from the Mississippi River and hypoxia in the Gulf of Mexico with varied success. Here we describe the dev...

  8. 75 FR 39495 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-09

    ... Administration (NOAA), Commerce. ACTION: Council to convene public meeting. SUMMARY: The Gulf of Mexico Fishery... FURTHER INFORMATION CONTACT: Steven Atran, Population Dynamics Statistician; Gulf of Mexico Fishery... Council actions relative to the Generic Annual Catch Limit/Accountability Measures Amendment, and review...

  9. Biogeochemistry of Submarine Groundwater Discharge to the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Telfeyan, K.; Breaux, A.; Kim, J.; Kolker, A.; Johannesson, K. H.; Cable, J. E.

    2013-12-01

    Regional radon surveys were initiated in the spring/summer of 2013 to evaluate the potential importance of submarine groundwater discharge (SGD) in the Mississippi River delta region. Buried paleochannels consisting of sand and other relatively coarse grained sediment likely provide transport pathways for substantial fluxes of freshwater and associated dissolved constituents to the Gulf of Mexico through their subsurface linkage with the main river channel and their higher permeability than interdistributary sediments. Initial radon investigations identify potential groundwater inputs to Lac des Allemands preferentially along bayous closest to the Mississippi, especially associated with the peak discharge of the Mississippi. Based on these radon survey results, more focused groundwater and surface water sampling was conducted to characterize the general chemistry of SGD in the region. Generally, pH and Eh change from the fresh groundwater end member to the seawater end member, demonstrating a clear river signal in the SGD and creating a dynamic environment with the potential for multiple geochemical reactions. Major cation data shows a general mixing trend in Lac des Allemands water: samples are more alkaline closest to the Mississippi River end member. Sequential sediment digestions indicate that much of the lake sediments consist of organic matter, which likely lowers the alkalinity of the lake end member. This study will also concentrate on the specific changes in oxyanion chemistry (i.e. arsenic and vanadium) along flowpaths from fresh to saline waters within the local subterranean estuaries. The oxyanions will provide a means to investigate the influence of redox chemistry in subterranean estuaries on the SGD fluxes of trace elements to the local interdistributary bays.

  10. 76 FR 10561 - Gulf of Mexico Fishery Management Council; Public Meetings

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-02-25

    ... convene the Law Enforcement Advisory Panel along with the Gulf States Marine Fisheries Commission's Law... Gulf States, as well as the National Oceanic and Atmospheric Administration (NOAA) Law Enforcement, U.S... National Oceanic and Atmospheric Administration RIN 0648-XA249 Gulf of Mexico Fishery Management...

  11. Sargassum-associated mobile fauna communities in the Caribbean, Gulf of Mexico, and Sargasso Sea

    NASA Astrophysics Data System (ADS)

    Martin, L.; Schell, J. M.; Goodwin, D.; Biggs, D.; Siuda, A. N.

    2016-02-01

    Sargassum natans and S. fluitans are entirely pelagic, offering a pseudo-benthic structural habitat for an associated community of mobile fauna. In turn, the mobile fauna community supports foraging seabirds, fish, and turtles. Recent satellite observations suggest Sargassum in the Sargasso Sea is seeded annually from the Gulf of Mexico. Furthermore, the Caribbean is in the midst of a Sargassum inundation that appears disconnected in origin from the Sargasso Sea and Gulf of Mexico. Sargassum and fauna were collected via dip net during spring and summer 2015 from the Gulf of Mexico, Sargasso Sea and Eastern Caribbean to study the impacts that region, aggregation pattern (isolated clump, windrow, mat), and Sargassum variety morphology have on mobile fauna community composition. Sargassum from all three regions shared five common (frequency >10%) species: flatworm spp., Portunus sayi, Litiopa melanostoma, Leander tenuicornis, and Latreutes fucorum). The Gulf presented the most unique species (9 unique / 16 total) followed by the Sargasso Sea (5 unique / 12 total) and the Caribbean (1 unique / 6 total). The majority of species unique to the Gulf of Mexico were juvenile fish while those in the Caribbean and Sargasso Sea were benthic-like species residing on the Sargassum itself. Differences in the morphological forms of Sargassum had a marked effect on fauna diversity and abundance. In all three regions, fewer individuals and species were found on the broad-leafed, less compact S. natans VIII than on the denser S. natans I and S. fluitans III. This study identifies the differences in macrofauna abundance and diversity between varieties of Sargassum and highlights the potential for dramatic community changes that could result from largescale Sargassum blooms and species shifts. Any shift in these keystone communities could result in negative cascading effects on seabirds, economically important fish populations, and juvenile turtles which use the seaweed as a nursery

  12. Organic carbon isotope ratios of recent sediments from coastal lagoons of the Gulf of Mexico, Mexico

    NASA Astrophysics Data System (ADS)

    Botello, Alfonso V.; Mandelli, Enrique F.; Macko, Steve; Parker, Patrick L.

    1980-03-01

    The stable carbon isotope composition sedimentary organic carbon was determined in the sediments of seven coastal lagoons of the Gulf of Mexico, Mexico. For most of the lagoons the δ13C values for sediments ranged from -20.1 to -23.9%. Anomalously low values, -26.8 to 29.3%. were determined in sediments of two of the studied lagoons, probably due to the presence of organic carbon from anthropogenic sources, naturally absent in these environments. The δ13C values determined in the tissues of oysters collected at the same time in the different lagoons were very similar to those recorded in the sediments.

  13. Facing Today's Exploration Challenges in the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Detomo, R.

    2005-05-01

    The Gulf of Mexico represents one of the most intensively explored basins in the world, and yet it still delivers significant new material oil and gas discoveries every year. Because of it high productivity, geologic complexity, competitive acreage access and large profitability margins, the Gulf of Mexico presents many industry-leading challenges to Exploration today. For major companies exploring for oil and gas in the Gulf of Mexico today, their challenge is to "safely, responsibly and profitably find and produce reduced accumulations in increasingly hostile settings." The GoM serves as the sportsman's playground for a significant population located in and around its waters, and therefore, operating safely and responsibly are unassailable moral and operational standards by which we sustain future development, and maintain our license to operate. With that as a backdrop, today's challenges are driven by the nature of where the business is looking for new reserves in this extremely mature basin. These "Opportunities" encompass the following: 1) large, under-explored, sub-salt areas, characterized by poor seismic imaging, uncertain geologic regimes and potentially dangerous overpressures, 2) deep true-vertical-depth opportunities in older rocks that challenge our understanding of reservoir quality prediction and hydrocarbon systems, and are at the edge of today's drilling technologies, 3) access to sensitive areas including the eastern GoM-Florida shelf, coastal areas and international borders, 4) challenging "small accumulation" discoveries that cannot support expensive appraisal or development options, are remote to infrastructure or inefficiently produce the reservoir, and finally 5) new play development, which is challenged by long maturation cycles, small acreage blocks, intense international competition, and rapid lease rolls. This talk will consider what Shell and the Oil & Gas Industry does today to succeed in this arena, and specifically will show examples

  14. Assessing coastal wetland vulnerability to sea-level rise along the northern Gulf of Mexico coast: Gaps and opportunities for developing a coordinated regional sampling network.

    PubMed

    Osland, Michael J; Griffith, Kereen T; Larriviere, Jack C; Feher, Laura C; Cahoon, Donald R; Enwright, Nicholas M; Oster, David A; Tirpak, John M; Woodrey, Mark S; Collini, Renee C; Baustian, Joseph J; Breithaupt, Joshua L; Cherry, Julia A; Conrad, Jeremy R; Cormier, Nicole; Coronado-Molina, Carlos A; Donoghue, Joseph F; Graham, Sean A; Harper, Jennifer W; Hester, Mark W; Howard, Rebecca J; Krauss, Ken W; Kroes, Daniel E; Lane, Robert R; McKee, Karen L; Mendelssohn, Irving A; Middleton, Beth A; Moon, Jena A; Piazza, Sarai C; Rankin, Nicole M; Sklar, Fred H; Steyer, Greg D; Swanson, Kathleen M; Swarzenski, Christopher M; Vervaeke, William C; Willis, Jonathan M; Wilson, K Van

    2017-01-01

    Coastal wetland responses to sea-level rise are greatly influenced by biogeomorphic processes that affect wetland surface elevation. Small changes in elevation relative to sea level can lead to comparatively large changes in ecosystem structure, function, and stability. The surface elevation table-marker horizon (SET-MH) approach is being used globally to quantify the relative contributions of processes affecting wetland elevation change. Historically, SET-MH measurements have been obtained at local scales to address site-specific research questions. However, in the face of accelerated sea-level rise, there is an increasing need for elevation change network data that can be incorporated into regional ecological models and vulnerability assessments. In particular, there is a need for long-term, high-temporal resolution data that are strategically distributed across ecologically-relevant abiotic gradients. Here, we quantify the distribution of SET-MH stations along the northern Gulf of Mexico coast (USA) across political boundaries (states), wetland habitats, and ecologically-relevant abiotic gradients (i.e., gradients in temperature, precipitation, elevation, and relative sea-level rise). Our analyses identify areas with high SET-MH station densities as well as areas with notable gaps. Salt marshes, intermediate elevations, and colder areas with high rainfall have a high number of stations, while salt flat ecosystems, certain elevation zones, the mangrove-marsh ecotone, and hypersaline coastal areas with low rainfall have fewer stations. Due to rapid rates of wetland loss and relative sea-level rise, the state of Louisiana has the most extensive SET-MH station network in the region, and we provide several recent examples where data from Louisiana's network have been used to assess and compare wetland vulnerability to sea-level rise. Our findings represent the first attempt to examine spatial gaps in SET-MH coverage across abiotic gradients. Our analyses can be used

  15. Assessing coastal wetland vulnerability to sea-level rise along the northern Gulf of Mexico coast: Gaps and opportunities for developing a coordinated regional sampling network

    PubMed Central

    Griffith, Kereen T.; Larriviere, Jack C.; Feher, Laura C.; Cahoon, Donald R.; Enwright, Nicholas M.; Oster, David A.; Tirpak, John M.; Woodrey, Mark S.; Collini, Renee C.; Baustian, Joseph J.; Breithaupt, Joshua L.; Cherry, Julia A.; Conrad, Jeremy R.; Cormier, Nicole; Coronado-Molina, Carlos A.; Donoghue, Joseph F.; Graham, Sean A.; Harper, Jennifer W.; Hester, Mark W.; Howard, Rebecca J.; Krauss, Ken W.; Kroes, Daniel E.; Lane, Robert R.; McKee, Karen L.; Mendelssohn, Irving A.; Middleton, Beth A.; Moon, Jena A.; Piazza, Sarai C.; Rankin, Nicole M.; Sklar, Fred H.; Steyer, Greg D.; Swanson, Kathleen M.; Swarzenski, Christopher M.; Vervaeke, William C.; Willis, Jonathan M.; Wilson, K. Van

    2017-01-01

    Coastal wetland responses to sea-level rise are greatly influenced by biogeomorphic processes that affect wetland surface elevation. Small changes in elevation relative to sea level can lead to comparatively large changes in ecosystem structure, function, and stability. The surface elevation table-marker horizon (SET-MH) approach is being used globally to quantify the relative contributions of processes affecting wetland elevation change. Historically, SET-MH measurements have been obtained at local scales to address site-specific research questions. However, in the face of accelerated sea-level rise, there is an increasing need for elevation change network data that can be incorporated into regional ecological models and vulnerability assessments. In particular, there is a need for long-term, high-temporal resolution data that are strategically distributed across ecologically-relevant abiotic gradients. Here, we quantify the distribution of SET-MH stations along the northern Gulf of Mexico coast (USA) across political boundaries (states), wetland habitats, and ecologically-relevant abiotic gradients (i.e., gradients in temperature, precipitation, elevation, and relative sea-level rise). Our analyses identify areas with high SET-MH station densities as well as areas with notable gaps. Salt marshes, intermediate elevations, and colder areas with high rainfall have a high number of stations, while salt flat ecosystems, certain elevation zones, the mangrove-marsh ecotone, and hypersaline coastal areas with low rainfall have fewer stations. Due to rapid rates of wetland loss and relative sea-level rise, the state of Louisiana has the most extensive SET-MH station network in the region, and we provide several recent examples where data from Louisiana’s network have been used to assess and compare wetland vulnerability to sea-level rise. Our findings represent the first attempt to examine spatial gaps in SET-MH coverage across abiotic gradients. Our analyses can be

  16. Assessing coastal wetland vulnerability to sea-level rise along the northern Gulf of Mexico coast: Gaps and opportunities for developing a coordinated regional sampling network

    USGS Publications Warehouse

    Osland, Michael J.; Griffith, Kereen T.; Larriviere, Jack C.; Feher, Laura C.; Cahoon, Donald R.; Enwright, Nicholas M.; Oster, David A.; Tirpak, John M.; Woodrey, Mark S.; Collini, Renee C.; Baustian, Joseph J.; Breithaupt, Joshua L.; Cherry, Julia A; Conrad, Jeremy R.; Cormier, Nicole; Coronado-Molina, Carlos A.; Donoghue, Joseph F.; Graham, Sean A.; Harper, Jennifer W.; Hester, Mark W.; Howard, Rebecca J.; Krauss, Ken W.; Kroes, Daniel; Lane, Robert R.; Mckee, Karen L.; Mendelssohn, Irving A.; Middleton, Beth A.; Moon, Jena A.; Piazza, Sarai; Rankin, Nicole M.; Sklar, Fred H.; Steyer, Gregory D.; Swanson, Kathleen M.; Swarzenski, Christopher M.; Vervaeke, William; Willis, Jonathan M; Van Wilson, K.

    2017-01-01

    Coastal wetland responses to sea-level rise are greatly influenced by biogeomorphic processes that affect wetland surface elevation. Small changes in elevation relative to sea level can lead to comparatively large changes in ecosystem structure, function, and stability. The surface elevation table-marker horizon (SET-MH) approach is being used globally to quantify the relative contributions of processes affecting wetland elevation change. Historically, SET-MH measurements have been obtained at local scales to address site-specific research questions. However, in the face of accelerated sea-level rise, there is an increasing need for elevation change network data that can be incorporated into regional ecological models and vulnerability assessments. In particular, there is a need for long-term, high-temporal resolution data that are strategically distributed across ecologically-relevant abiotic gradients. Here, we quantify the distribution of SET-MH stations along the northern Gulf of Mexico coast (USA) across political boundaries (states), wetland habitats, and ecologically-relevant abiotic gradients (i.e., gradients in temperature, precipitation, elevation, and relative sea-level rise). Our analyses identify areas with high SET-MH station densities as well as areas with notable gaps. Salt marshes, intermediate elevations, and colder areas with high rainfall have a high number of stations, while salt flat ecosystems, certain elevation zones, the mangrove-marsh ecotone, and hypersaline coastal areas with low rainfall have fewer stations. Due to rapid rates of wetland loss and relative sea-level rise, the state of Louisiana has the most extensive SET-MH station network in the region, and we provide several recent examples where data from Louisiana’s network have been used to assess and compare wetland vulnerability to sea-level rise. Our findings represent the first attempt to examine spatial gaps in SET-MH coverage across abiotic gradients. Our analyses can be

  17. Ambient Noise Classification in the Gulf of Mexico

    DTIC Science & Technology

    2007-10-01

    Gulf of Mexico during 2004 and 2005. The data were recorded continuously and have a bandwidth of 10-1000 Hz. Two-minute averages of Short Time Fourier Transforms (STFT) of the data were computed. The processed data contain wind and wave noise, distant shipping, nearby shipping and storm passage noise with amplitude variation spanning multiple time scales. These contributions to the overall noise level are additive in producing the total measured noise level at any time. An heuristic scheme based on determining the local mean noise level over a period of several

  18. Northern Gulf of Mexico: USGS science contributions to a resilient coast, 2006-2011

    USGS Publications Warehouse

    ,

    2007-01-01

    The devastating hurricane season of 2005 challenged U.S. Geological Survey (USGS) to develop a science base for resource managers and policy makers that could provide an understanding of the multiple stressors and influence affecting the northern Gulf of Mexico coast and to rack changes in linked coastal systems. The complexity of the Gulf Coast requires a science strategy for data collection and data reporting that is consistent across regional ecosystems and that can be applied to both short-term and long-term responses to stressors.

  19. Relationship of structural development and Cenozoic sedimentation, northern Gulf of Mexico

    SciTech Connect

    Humphris, C.C. Jr.

    1985-02-01

    Development of structure in the northern Gulf of Mexico, mainly listric faulting and salt features, is directly related to Cenozoic sedimentation. Essentially all oil and gas production in this region occurs in structural features resulting from faulting and/or salt movement. A thick section of continental shallow-water sediments rimming the entire Gulf of Mexico was deposited during overall Gulf subsidence in Mesozoic time. Very little sedimentation took place in the central Gulf, so that, at the close of the Mesozoic the central Gulf probably was of abyssal depths. Cenozoic sedimentation surpassed the rate of subsidence causing sediments to prograde across the Mesozoic shelf margin, with greatest deposition occurring gulfward of this margin. These depocenters or areas of thickest sedimentation prograded gulfward throughout time (in response to sediment supply) and migrated northeastward from south Texas to south Louisiana. Listric or growth faults that formed contemporaneously with deposition are a common structural feature developed during Cenozoic sedimentation. These features are apparently caused by differential loading of higher density sandstones on prodelta shales near the shelf margin. In those areas underlain by thicker salt, such as the Miocene and younger depocenters, there is greater involvement of salt in growth-fault development. Salt features, the other major type of producing structure, are developed by salt movement as a direct response to Cenozoic sediment loading. Initiation of salt movement is believed to be due to differential loading of prograding sediments. Further salt movement and structural development are completely dependent on continued sedimentation.

  20. Environmental and economic assessment of discharges from Gulf of Mexico region oil and gas operations. Quarterly technical progress report, April--June 1993

    SciTech Connect

    Gettleson, D.A.

    1993-07-26

    Continental Shelf Associates, Inc. (CSA) was contracted to conduct a three-year study of the environmental and health related impacts of produced water and sand discharges from oil and gas operations. Data on naturally occurring radioactive materials (NORM), heavy metals, and hydrocarbons in water, sediment, and biota will be collected and evaluated. Health related impacts will be studied through field collections and analyses of commercially- and recreationally-important fish and shellfish tissues. Additionally, information on seafood catch, consumption, and use patterns for the Gulf of Mexico will be gathered and analyzed. The facilities to be studied will include both offshore and coastal facilities in the Gulf of Mexico. Coastal sites will be additionally studied to determine ecological recovery of impacted wetland and open bay areas. The economic impact of existing and proposed effluent federal and state regulations will also be evaluated. The primary objectives of the project are to increase the base of scientific knowledge concerning (1) the fate and environmental effects of organics, trace metals, and NORM in water, sediment, and biota near several offshore oil and gas facilities; (2) the characteristics of produced water and produced sand discharges as they pertain to organics, trace metals, and NORM variably found in association with the discharges; (3) the recovery of four terminated produced water discharge sites located in wetland and high-energy open bay sites of coastal Louisiana and Texas; (4) the economic and energy supply impacts of existing and anticipated federal and state offshore and coastal discharge regulations; and (5) the catch, consumption and human use patterns of seafood species collected from coastal and offshore waters. Accomplishments for this period are described.

  1. Oil Spill in Gulf of Mexico April 29th View

    NASA Image and Video Library

    2017-09-27

    2010/119 - 04/29 at 16 :48 UTC Oil slick in the Gulf of Mexico (Input Direct Broadcast data courtesy Direct Readout Lab, NASA/GSFC) Satellite: Terra NASA/GSFC/Jeff Schmaltz/MODIS Land Rapid Response Team To learn more about MODIS go to: rapidfire.sci.gsfc.nasa.gov/gallery/?latest NASA Goddard Space Flight Center is home to the nation's largest organization of combined scientists, engineers and technologists that build spacecraft, instruments and new technology to study the Earth, the sun, our solar system, and the universe.

  2. Tropical Storm Hermine in the Gulf of Mexico

    NASA Image and Video Library

    2017-09-27

    NASA image acquired Sept 6, 2010 at 16 :45 UTC Tropical Storm Hermine (10L) in the Gulf of Mexico Satellite: Terra Credit: NASA/GSFC/Jeff Schmaltz/MODIS Land Rapid Response Team To learn more go to: www.nasa.gov/mission_pages/hurricanes/archives/2010/h2010... NASA Goddard Space Flight Center is home to the nation's largest organization of combined scientists, engineers and technologists that build spacecraft, instruments and new technology to study the Earth, the sun, our solar system, and the universe. Follow us on Twitter Join us on Facebook

  3. Temperature inversions in the open Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Weatherly, Georges; Wienders, Nicolas; Harkema, Reinard

    2003-06-01

    Some ˜1500 PALACE float temperature profiles obtained throughout the Gulf of Mexico between April 1998 and March 2002 indicate that temperature inversions are rather common. Most are seen near the surface, but some are seen at essentially all depths down to the deepest measurement at about 1000 m. The inversions are associated with layers of relatively cool, and presumed fresher, riverine and coastal waters. Most are attributed to the Mississippi River and Mexican rivers discharging into the Campeche Bay, and a few are thought to have drifted in from the Caribbean Sea.

  4. Origin of hydrocarbons in Gulf of Mexico basin: A reappraisal

    SciTech Connect

    Bissada, K.K.; Katz, B.J.; Barnicle, S.C.; Schunk, D.J.

    1988-01-01

    The origin of hydrocarbons in the Gulf of Mexico basin has been a subject of controversy for many years. One argument invokes source rocks of average organic enrichment, pervasively distributed throughout the Tertiary sequence and closely associated with the reservoir system. Another argument invokes exceptionally rich, discrete source rocks not in contact with the reservoirs, possibly in pre-Tertiary sequences. Continued exploration success in the basin hinges on the resolution of this controversy because of implications on patterns of hydrocarbon migration within the basin and the timing of petroleum generation relative to reservoir and trap development. Geochemical analyses of hundreds of crude oils, natural gases, and nonreservoir rocks from the Mesozoic and Cenozoic trends along the northern Gulf of Mexico basin indicate the general inadequacy of the Tertiary section to source the huge oil accumulations within Cenozoic reservoirs. Furthermore, other than the biogenic gas, isotopic data indicate that the majority of nonassociated gases found in Cenozoic accumulations have been thermogenically derived from much greater depths where maturation is consistent with dry gas generation. Geochemical data from several Mesozoic units in the basin, but outside the Cenozoic trend proper, indicate the existence of excellent Mesozoic source rocks. It is proposed that such units extend below the Cenozoic producing trends and are drained by deep-seated faults and piercement salt structures. Maturation history, structural style, and patterns of migration and remigration control the variable productivity along the various trends.

  5. Crustal structure of the Eastern Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Nwafor, Emeka

    The Gulf of Mexico initiated in the Late Triassic as South America and Africa separated from North America during the break up of Pangea. Previous studies indicate three models for the opening of the GOM. These include counter clockwise rotation of the Yucatan Block, rotation of the Yucatan Block about the same pole of rotation as those describing seafloor spreading in the central North Atlantic, and clockwise rotation of the Yucatan Block. There is much debate about the margin type and the crustal structure of the Eastern Gulf of Mexico (EGOM), especially below the depth of 6 km where crustal structure is poorly imaged on seismic reflection data. Two 2.5-D forward gravity and magnetic models across the margin are presented. These are constrained by basement picks from sparse seismic reflection and refraction data, spectral analysis of gravity data to determine the depth to source, magnetic susceptibility derived from results from other margins, the empirical relationship between P-wave velocity and density, and crustal scale isostatic modeling. The models, combined with a kinematic reconstruction of the GOM, show that: 1) it is a rifted margin; 2) the point where the Moho deepens downward from ˜17 km to ˜32 km is approximately 50 km outboard of the topographic shelf edge; 3) the carbonate bank retreated by several kilometers from its original termination due to the action of contourite currents; 4) extension and subsidence was accommodated with little shallow brittle faulting; 5) oceanic lithosphere is possibly outboard of the EGOM continental slope.

  6. Bibliography of marine turtles in the Gulf of Mexico and Caribbean Sea

    SciTech Connect

    Payne, S.F.

    1981-07-01

    Information on the organisms at proposed Ocean Thermal Energy Conversion (OTEC) sites is required to assess the potential impacts of OTEC power plant operations. To gather information on the distribution, abundance and biology of organisms known to occur in OTEC regions, the Marine Sciences Group at Lawrence Berkeley laboratory conducted literature surveys of those organisms. This bibliography is the product of a literature survey on marine turtles at proposed OTEC sites off Puerto Rico and in the Gulf of Mexico. 126 references.

  7. Permeability and compressibility of resedimented Gulf of Mexico mudrock

    NASA Astrophysics Data System (ADS)

    Betts, W. S.; Flemings, P. B.; Schneider, J.

    2011-12-01

    We use a constant-rate-of strain consolidation test on resedimented Gulf of Mexico mudrock to determine the compression index (Cc) to be 0.618 and the expansion index (Ce) to be 0.083. We used crushed, homogenized Pliocene and Pleistocene mudrock extracted from cored wells in the Eugene Island block 330 oil field. This powdered material has a liquid limit (LL) of 87, a plastic limit (PL) of 24, and a plasticity index (PI) of 63. The particle size distribution from hydrometer analyses is approximately 65% clay-sized particles (<2 μm) with the remainder being less than 70 microns in diameter. Resedimented specimens have been used to characterize the geotechnical and geophysical behavior of soils and mudstones independent of the variability of natural samples and without the effects of sampling disturbance. Previous investigations of resedimented offshore Gulf of Mexico sediments (e.g. Mazzei, 2008) have been limited in scope. This is the first test of the homogenized Eugene Island core material. These results will be compared to in situ measurements to determine the controls on consolidation over large stress ranges.

  8. Numerical Modeling of Methanogenesis at Walker Ridge, Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Glosser, D.; Cook, A.; Malinverno, A.; Daigle, H.

    2014-12-01

    Methane migration is a crucial link between locations of methane generation and natural gas hydrate reservoirs, yet migration mechanisms are poorly understood in the natural environment. In this study, we evaluate constraints on methanogenesis and methane diffusion through the development of a 1-dimensional diagenetic model of the Gulf of Mexico Gas Hydrate Joint Industry Project Site Walker Ridge 313 in the Gulf of Mexico. High saturation gas hydrate was confirmed at Walker Ridge from borehole logs, which measured both high compressional velocity and high resistivity in hydrate-bearing sand layers. Gas hydrate formation depends largely on organic matter concentration and methanogenesis rates. We will test how much organic matter is required to achieve gas hydrate saturations observed at Walker Ridge. Our model will incorporate methane generation around a sand layer as it is moves down through the sediment column. Variable porosity across the sediment column due to early diagenesis and sediment compaction will also be considered. Since methane solubility is higher in finer grained sediments due to smaller pore spaces, gas hydrate will form in the sand layer from methane transported by the relatively slow process of diffusion from finer grained layers. The results of this model are critical to the development of the basin scale simulation of overall methane flux based on the geometry of WR313. The simulation results will improve scientific characterization of how hydrates form and distribute within continental margin sediments.

  9. Source Functions and Path Effects from Earthquakes in the Farallon Transform Fault Region, Gulf of California, Mexico that Occurred on October 2013

    NASA Astrophysics Data System (ADS)

    Castro, Raúl R.; Stock, Joann M.; Hauksson, Egill; Clayton, Robert W.

    2016-07-01

    We determined source spectral functions, Q and site effects using regional records of body waves from the October 19, 2013 (M w = 6.6) earthquake and eight aftershocks located 90 km east of Loreto, Baja California Sur, Mexico. We also analyzed records from a foreshock with magnitude 3.3 that occurred 47 days before the mainshock. The epicenters of this sequence are located in the south-central region of the Gulf of California (GoC) near and on the Farallon transform fault. This is one of the most active regions of the GoC, where most of the large earthquakes have strike-slip mechanisms. Based on the distribution of the aftershocks, the rupture propagated northwest with a rupture length of approximately 27 km. We calculated 3-component P- and S-wave spectra from ten events recorded by eleven stations of the Broadband Seismological Network of the GoC (RESBAN). These stations are located around the GoC and provide good azimuthal coverage (the average station gap is 39°). The spectral records were corrected for site effects, which were estimated calculating average spectral ratios between horizontal and vertical components (HVSR method). The site-corrected spectra were then inverted to determine the source functions and to estimate the attenuation quality factor Q. The values of Q resulting from the spectral inversion can be approximated by the relations Q_{P} = 48.1 ± 1.1 f^{0.88 ± 0.04} and Q_{S} = 135.4 ± 1.1 f^{0.58 ± 0.03} and are consistent with previous estimates reported by Vidales-Basurto et al. (Bull Seism Soc Am 104:2027-2042, 2014) for the south-central GoC. The stress drop estimates, obtained using the ω2 model, are below 1.7 MPa, with the highest stress drops determined for the mainshock and the aftershocks located in the ridge zone. We used the values of Q obtained to recalculate source and site effects with a different spectral inversion scheme. We found that sites with low S-wave amplification also tend to have low P-wave amplification, except

  10. Source Functions and Path Effects from Earthquakes in the Farallon Transform Fault Region, Gulf of California, Mexico that Occurred on October 2013

    NASA Astrophysics Data System (ADS)

    Castro, Raúl R.; Stock, Joann M.; Hauksson, Egill; Clayton, Robert W.

    2017-06-01

    We determined source spectral functions, Q and site effects using regional records of body waves from the October 19, 2013 ( M w = 6.6) earthquake and eight aftershocks located 90 km east of Loreto, Baja California Sur, Mexico. We also analyzed records from a foreshock with magnitude 3.3 that occurred 47 days before the mainshock. The epicenters of this sequence are located in the south-central region of the Gulf of California (GoC) near and on the Farallon transform fault. This is one of the most active regions of the GoC, where most of the large earthquakes have strike-slip mechanisms. Based on the distribution of the aftershocks, the rupture propagated northwest with a rupture length of approximately 27 km. We calculated 3-component P- and S-wave spectra from ten events recorded by eleven stations of the Broadband Seismological Network of the GoC (RESBAN). These stations are located around the GoC and provide good azimuthal coverage (the average station gap is 39°). The spectral records were corrected for site effects, which were estimated calculating average spectral ratios between horizontal and vertical components (HVSR method). The site-corrected spectra were then inverted to determine the source functions and to estimate the attenuation quality factor Q. The values of Q resulting from the spectral inversion can be approximated by the relations Q_{{P}} = 48.1 ± 1.1 f^{0.88 ± 0.04} and Q_{{S}} = 135.4 ± 1.1 f^{0.58 ± 0.03} and are consistent with previous estimates reported by Vidales-Basurto et al. (Bull Seism Soc Am 104:2027-2042, 2014) for the south-central GoC. The stress drop estimates, obtained using the ω2 model, are below 1.7 MPa, with the highest stress drops determined for the mainshock and the aftershocks located in the ridge zone. We used the values of Q obtained to recalculate source and site effects with a different spectral inversion scheme. We found that sites with low S-wave amplification also tend to have low P-wave amplification

  11. Gulf of Mexico Air/Sea Interaction: Measurements and Initial Data Characterization

    NASA Astrophysics Data System (ADS)

    MacDonald, C.; Huang, C. H.; Roberts, P. T.; Bariteau, L.; Fairall, C. W.; Gibson, W.; Ray, A.

    2011-12-01

    Corporate, government, and university researchers collaborated to develop an atmospheric boundary layer environmental observations program on an offshore platform in the Gulf of Mexico. The primary goals of this project were to provide data to (1) improve our understanding of boundary layer processes and air-sea interaction over the Gulf of Mexico; (2) improve regional-scale meteorological and air quality modeling; and (3) provide a framework for advanced offshore measurements to support future needs such as emergency response, exploration and lease decisions, wind energy research and development, and meteorological and air quality forecasting. In October 2010, meteorological and oceanographic sensors were deployed for an extended period (approximately 12 months) on a Chevron service platform (ST 52B, 90.5W, 29N) to collect boundary layer and sea surface data sufficient to support these objectives. This project has significant importance given the large industrial presence in the Gulf, sizeable regional population nearby, and the recognized need for precise and timely pollutant forecasts. Observations from this project include surface meteorology; sodar marine boundary layer winds; microwave radiometer profiles of temperature, relative humidity, and liquid water; ceilometer cloud base heights; water temperature and current profiles; sea surface temperature; wave height statistics; downwelling solar and infrared radiation; and air-sea turbulent momentum and heat fluxes. This project resulted in the collection of an unprecedented set of boundary layer measurements over the Gulf of Mexico that capture the range of meteorological and oceanographic interactions and processes that occur over an entire year. This presentation will provide insight into the logistical and scientific issues associated with the deployment and operations of unique measurements in offshore areas and provide results from an initial data analysis of boundary layer processes over the Gulf of

  12. Biostratigraphic expression of pleistocene sequence boundaries, Gulf of Mexico

    SciTech Connect

    Martin, R.E. ); Neff, E.D. ); Johnson, G.W. ); Krantz, D.E. )

    1993-04-01

    The quaternary section west of the Mississippi River delta consists of thousands of meters of terrigenous sediments, but the stratigraphic and paleoclimatic history recorded in these sequences is often distorted as a result of salt and shale diapirism. Quaternary sequences of the western Gulf of Mexico often reflect highly variable sediment accumulation rates within and between isolated salt-withdrawal basins and missing section resulting from unconformities and extensive faulting. The sedimentary record of Ocean Drilling Program's Core 625B (northeast Gulf of Mexico) contains significant unconformaties that represent a record of sea-level change during the Pleistocene. The core may thus serve as a standard for timing of sea-level changes of the Western Gulf. Utilizing primarily relative abundances of the warm-water Globorotalia menardii complex and cool water G. inflata, we have subdivided the pre-zone W Pleistocene of Core 625B into 17 subzones, resulting in an average duration of approximately 100,000 years per unit. Based on graphic correlation, subzonal boundaries are largely coeval between sites and can provide high-resolution biostratigraphic subdivision of the Pleistocene of industrial wells on an operational basis. Also, the subzonation delineates anomalous paleotops that are reworked, erosionally truncated at sequence boundaries or delta-depressed as a result of localized sediment influx. Graphic correlation of subzonal boundaries coupled with available biostratigraphic and magnetostrategraphic datums has demonstrated the near synchronomy of subzonal boundaries and their utility in the subdivision of the Pleistocene. Using graphic correlation, the paleontologist can build viable exploration models that can be used to predict the occurrence of hydrocarbon reservoir sands. 87 refs., 13 figs.

  13. Prospects and Techniques for Eddy-Resolving Acoustic Tomography in the Eastern Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Caruthers, J. W.; Nechaev, D.; Roman, D. A.; Sidorovskaia, N. A.; Ioup, G. E.; Ioup, J.; Yaremchuk, M.

    2007-05-01

    For several decades monitoring and modeling the dynamics and physical structure of the Gulf of Mexico have been major efforts undertaken by oceanographers of the United States and other American countries. There are very interesting physical oceanographic features in the Gulf, not the least of which are the Gulf Loop Current and the eddies it spawns. Satellite sensing of IR and altimeter imagery has been a major input to modeling those features. Such efforts are very important to the economy and well being of much of the United States and Mexico, including fisheries, mineral economies, hurricane strengths and paths in the summer, and severe snow storms in the eastern US in the winter. A major shortcoming of the present monitoring of the Gulf is the lack of subsurface input to the dynamic models of the Gulf. Acoustic tomography is a viable means of providing that missing input. Several universities have come together to investigate the prospects for establishing a Gulf Eddy Monitoring System (GEMS) for the deep eastern half of the Gulf using acoustic tomography. The group has conducted several acoustics experiments and propagation studies to determine the feasibility of long-range propagation in the eastern Gulf and the mitigation of adverse effects on marine mammal populations in that region under the Office of Naval Research project entitled the Littoral Acoustic Demonstration Center (LADC). The group has also convened an invited session for the 9th World Multiconference on Systemics, Cybernetics and Informatics (WMSCI 2005) Orlando, FL, July 2005. This paper discusses prospects for establishing the GEMS tomographic system, its technical characteristics, and its contributions to advancing the knowledge of the dynamics of the Gulf. This presentation will concentrate on the characteristics of a single-slice tomographic system, called GEMS Phase I, across the approaches to the DeSoto Canyon in the northeastern Gulf and its prospect for monitoring the movements of

  14. Petroleum pollution in the Gulf of Mexico and Caribbean Sea.

    PubMed

    Botello, A V; Villanueva, S; Díaz, G

    1997-01-01

    In 1976, IOC-UNESCO and UNEP convened a meeting in Port of Spain to analyze the marine pollution problems in the region, noting that petroleum pollution was of regionwide concern and recommended initiating a research and monitoring program to determine the severity of the problem and monitor its effects. The Wider Caribbean is potentially one of the largest oil-producing areas in the world. Major production sites include Louisiana and Texas in the U.S.; the Bay of Campeche, Mexico; Lake Maracaibo, Venezuela; and the Gulf of Paria, Trinidad. All these are classified as high-risk production accident zones. Main sources of petroleum pollution in the Wider Caribbean are production, exploitation, transportation, urban and municipal discharges, refining and chemical wastes, normal loading and unloading operations, and accidental spills. About 5 million barrels of crude oil are transported daily in the Caribbean, thus generating an intense tanker traffic. It has been estimated that oil discharges from tank washings within the Wider Caribbean could be as high as 7 million barrels/yr. The results of the Caribbean Pollution Regional Program (CARIPOL) conducted between 1980 and 1987 pointed out that significant levels of petroleum pollution exist throughout the Wider Caribbean, including serious tar contamination of windward exposed beaches, high levels of floating tar within the major current systems, and very high levels of dissolved and dispersed hydrocarbons in surface waters. Major adverse effects of this type of pollution include: high tar levels on many beaches that either prevent their recreational use or require very expensive cleanup operations, distress and death for marine life, and responses in the enzyme systems of marine organisms that have been correlated with declines in reproductive success. Finally, the presence of polycyclic aromatic hydrocarbons (PAHs) in tissues of important economic species has been reported, creating a risk for public health because of

  15. A seismic-reflection investigation of gas hydrates and sea-floor features of the upper continental slope of the Garden Banks and Green Canyon regions, northern Gulf of Mexico: report for cruise G1-99-GM (99002)

    USGS Publications Warehouse

    Cooper, Alan; Twichell, David; Hart, Patrick

    1999-01-01

    During April 1999, the U.S. Geological Survey (USGS) conducted a 13-day cruise in the Garden Banks and Green Canyon regions of the Gulf of Mexico. The R/V Gyre, owned by Texas A&M University, was chartered for the cruise. The general objectives were (1) to acquire very high resolution seismic-reflection data and side-scan sonar images of the upper and middle continental slope (200-1200-m water depths), (2) to study the acoustic character and features of the sea floor for evidence of sea-floor hazards, and (3) to look for evidence of subsurface gas hydrates and their effects. The Gulf of Mexico is well known for hydrocarbon resources, with emphasis now on frontier deep-water areas. For water depths greater than about 250 m, the pressure-termperature conditions are correct for the development of shallow-subsurface gas hydrate formation (Anderson et al., 1992). Gas hydrates are ice-like mixtures of gas and water (Kvenvolden, 1993). They are known to be present from extensive previous sampling in sea-floor cores and from mound-like features observed on the sea floor in many parts of the northern Gulf, including the Green Canyon and Garden Banks areas (e.g., Roberts, 1995). Seismic-reflection data are extensive in the Gulf of Mexico, but few very-high-resolution data like those needed for gas-hydrate studies exist in the public domain. The occurrence and mechanisms of gas hydrate formation and dissociation are important to understand, because of their perceived economic potential for methane gas, their potential controls on local and regional sea-floor stability, and their possible effects on earth climates due to massive release of methane greenhouse gas into the atmosphere. Three high-resolution seismic-reflection systems and one side-scan sonar system were used on the cruise to map the surface reflectance and features of the sea floor and the acoustic geometries and character of the shallow sub-surface. The cruise was designed to acquire regional and detailed local

  16. Hurricane Risk Variability along the Gulf of Mexico Coastline

    PubMed Central

    Trepanier, Jill C.; Ellis, Kelsey N.; Tucker, Clay S.

    2015-01-01

    Hurricane risk characteristics are examined across the U. S. Gulf of Mexico coastline using a hexagonal tessellation. Using an extreme value model, parameters are collected representing the rate or λ (frequency), the scale or σ (range), and the shape or ξ (intensity) of the extreme wind distribution. These latent parameters and the 30-year return level are visualized across the grid. The greatest 30-year return levels are located toward the center of the Gulf of Mexico, and for inland locations, along the borders of Louisiana, Mississippi, and Alabama. Using a geographically weighted regression model, the relationship of these parameters to sea surface temperature (SST) is found to assess sensitivity to change. It is shown that as SSTs increase near the coast, the frequency of hurricanes in these grids decrease significantly. This reinforces the importance of SST in areas of likely tropical cyclogenesis in determining the number of hurricanes near the coast, along with SSTs along the lifespan of the storm, rather than simply local SST. The range of hurricane wind speeds experienced near Florida is shown to increase with increasing SSTs (insignificant), suggesting that increased temperatures may allow hurricanes to maintain their strength as they pass over the Florida peninsula. The modifiable areal unit problem is assessed using multiple grid sizes. Moran’s I and the local statistic G are calculated to examine spatial autocorrelation in the parameters. This research opens up future questions regarding rapid intensification and decay close to the coast and the relationship to changing SSTs. PMID:25767885

  17. Hurricane risk variability along the Gulf of Mexico coastline.

    PubMed

    Trepanier, Jill C; Ellis, Kelsey N; Tucker, Clay S

    2015-01-01

    Hurricane risk characteristics are examined across the U. S. Gulf of Mexico coastline using a hexagonal tessellation. Using an extreme value model, parameters are collected representing the rate or λ (frequency), the scale or σ (range), and the shape or ξ (intensity) of the extreme wind distribution. These latent parameters and the 30-year return level are visualized across the grid. The greatest 30-year return levels are located toward the center of the Gulf of Mexico, and for inland locations, along the borders of Louisiana, Mississippi, and Alabama. Using a geographically weighted regression model, the relationship of these parameters to sea surface temperature (SST) is found to assess sensitivity to change. It is shown that as SSTs increase near the coast, the frequency of hurricanes in these grids decrease significantly. This reinforces the importance of SST in areas of likely tropical cyclogenesis in determining the number of hurricanes near the coast, along with SSTs along the lifespan of the storm, rather than simply local SST. The range of hurricane wind speeds experienced near Florida is shown to increase with increasing SSTs (insignificant), suggesting that increased temperatures may allow hurricanes to maintain their strength as they pass over the Florida peninsula. The modifiable areal unit problem is assessed using multiple grid sizes. Moran's I and the local statistic G are calculated to examine spatial autocorrelation in the parameters. This research opens up future questions regarding rapid intensification and decay close to the coast and the relationship to changing SSTs.

  18. Status of hepatocellular carcinoma in Gulf region.

    PubMed

    Rasul, Kakil Ibrahim; Al-Azawi, Safaa H; Chandra, Prem; Abou-Alfa, Ghassan K; Knuth, Alexander

    2013-12-01

    Hepatocellular carcinoma (HCC) has a unique geographic distribution that is likely to be determined by specific etiologic factors. There is a distinctive difference in sex and age related occurrence of disease. In the Gulf region, there are contradicting data on the prevalence and death rates due to HCC. In this review we highlight some aspects of HCC specific to the Gulf region. A retrospective analysis of 150 patient's data is presented, including demographic, epidemiological, aetiological disease status assessment with child Pugh criteria, modes of treatment and treatment related outcome. Hepatitis C virus (HCV) infection was the most common (45%) documented etiology, similar to Western European countries, followed by hepatitis B virus (HBV) infection in 27% of cases, alcoholic liver disease only in six patients (4%). Child-Pugh assessment was A in 33%, B in 37% and C in 30% of observed patients. Surgery (liver resection or transplantation) was performed in 12% and local ablation in 5% of cases. The others were treated by chemo-embolization in 17% and by systemic therapy with sorafenib in 13% of patients. Nearly half of the patients (53%) were in advanced stages and received palliative treatment. To improve the outcome of treatment in HCC patients in the Gulf region, an effective and strategic screening program must be implemented for early diagnosis and treatment to improve the outcome of this mostly fatal disease.

  19. ECONOMICS AND APPRAISAL OF CONVENTIONAL OIL AND GAS IN THE WESTERN GULF OF MEXICO.

    USGS Publications Warehouse

    Attanasi, E.D.; Haynes, John L.

    1984-01-01

    The oil and gas industry frequently appraises undiscovered oil and gas resources on a regional basis to decide whether to start or continue exploration programs. The appraisals are of little value unless conditioned by estimates of the costs of finding and producing the resources. This paper presents an economic appraisal of undiscovered oil and gas resources in the western Gulf of Mexico. Also presented are a description of the model used to make the assessment, results of a sensitivity analysis, and a discussion of the implications of the results to the industry. The appraisal is shown to be relatively robust to changes in physical and engineering assumptions. Because the number of commercial discoveries was found to be quite sensitive to economic conditions, the analysis has important implications in terms of forecasting future industry drilling and other associated activities in the western Gulf of Mexico.

  20. A recent perspective of the Circulation in the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Candela, J.; Ochoa-de-La-Torre, J. L.; Sheinbaum, J.; Perez-Brunius, P.; Pallas-Sanz, E.; Kolodziejczyk, N.

    2013-05-01

    The flow through the Gulf of Mexico is an integral part of the North Atlantic Ocean Subtropical Gyre Circulation, known to be forced by the wind over the North Atlantic and by an equivalent contribution from the inter-hemispheric Meridional Overturning Cell. To the North Atlantic Circulation, the Gulf represents an important energy and vorticity sink through the particular behavior of the Loop Current within. Comprehending the structure and dynamics of the Loop Current System (which includes the Yucatan Current (YC), Loop Current (LC), the shedding of anticyclonic Loop Current Eddies (LCE) and peripheral cyclonic gyres) is fundamental for understanding the circulation in the entire Gulf. Within the Gulf, the eastern Loop Current and the western Campeche Bay (CB) regions are characterized by persistent eddy structures, with less structured eddy fields in between. Of these later ones, the northwestern Gulf is a geostrophic turbulence area, constantly perturbed by LCE, which represents, at the same time, an important dissipation and circulation forcing region for the Western Gulf. Important processes recently investigated that will be discussed: 1) The generation and maintenance of the Geostrophic Turbulence field in the north western Gulf. 2) The circulation in deep water induced by the surface geostrophic turbulence field. 3) The generation of intensive jets at depth by interaction of +/- gyres. 4) The generation of coastal trap waves by the interaction of LCEs with the western shelf. 5) The generation of deep topographic Roosby waves by topographic interactions of the LCEs with topography. 5) The characteristics of the Bay of Campeche Circulation, The Campeche Gyre and its interaction with LCEs. 6) The Gulf's response to the passage of hurricanes. 7) The trapping of inertial waves by the LCEs and the related enhanced mixing.

  1. [Echinoderms (Echinodermata) from the Mexican waters of the Gulf of Mexico].

    PubMed

    Durán-González, Alicia; Laguarda-Figueras, Alfredo; Solís-Marin, Francisco A; Buitrón Sánchez, Blanca Estela; Ahearn, Cynthia Gust; Torres-Vega, Juan

    2005-12-01

    We present a systematic list of the echinoderms from Gulf of Mexico's Mexican waters based on specimens of the Colecci6n Nacional de Equinodermos, Instituto de Ciencias del Mar y Limnologia, Universidad Nacional Aut6noma de México and the National Museum of Natural History, Smithsonian Institution, Washington, D.C. This list reveals an important echinoderm biodiversity present in the Gulf of Mexico, where five of the six echinoderm classes are represented. A total of 209 echinoderm species is recorded, distributed in 129 genera, 63 families and 25 orders. 31 new records for the Gulf of Mexico are presented: Asteroidea (16), Ophiuroidea (nine), Echinoidea (one) and Holothuroidea (five).

  2. Making sense of ocean sensing: the Gulf of Mexico Coastal Ocean Observing System links observations to applications

    NASA Astrophysics Data System (ADS)

    Simoniello, Christina; Jochens, Ann E.; Howard, Matthew K.; Swaykos, Joseph; Levin, Douglas R.; Stone, Debbi; Kirkpatrick, Barbara; Kobara, Shinichi

    2011-06-01

    The Gulf of Mexico Coastal Ocean Observing System Regional Association (GCOOS-RA) works to enhance our ability to collect, deliver and use ocean information. The GCOOS-RA Education and Outreach Council works to bring together industry, governments, academia, formal and informal educators, and the public to assess regional needs for coastal ocean information, foster cooperation, and increase utility of the data. Examples of data products in varying stages of development are described, including web pages for recreational boaters and fishermen, novel visualizations of storm surge, public exhibits focused on five Gulf of Mexico Priority Issues defined by the Gulf of Mexico Alliance, a Harmful Algae Bloom warning system, the Basic Observation Buoy project designed to engage citizen scientists in ocean monitoring activities, and the GCOOS Data Portal, instrumental in Deepwater Horizon mitigation efforts.

  3. 78 FR 31519 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-24

    ... of Mexico Fishery Management Council; Public Meeting AGENCY: National Marine Fisheries Service (NMFS... Advisory Panel meeting. SUMMARY: The Gulf of Mexico Fishery Management Council will convene a meeting of... Mexico Fishery Management Council, 2203 North Lois Avenue, Suite 1100, Tampa, FL 33607. FOR FURTHER...

  4. Gulf of Mexico Sediment Phosphorus Fractionation: Implication for Hypoxia

    NASA Astrophysics Data System (ADS)

    Adhikari, P. L.; White, J. R.; Maiti, K.; Nguyen, N.

    2014-12-01

    Phosphorus (P) is one of the limiting nutrients in coastal environments, especially in river- dominated deltaic regions with large amount of inorganic nitrogen inputs from the river. The principal source of P to coastal waters is suspended particulate matter from river discharge, a large portion of which is deposited on the continental shelves. The bottom sediments thus can be an important source of P to the overlying water column depending on the concentrations and chemical forms of P. This study provides a quantitative determination of the abundance and chemical speciation of P from the shelf, slope and deep sea sediments of coastal Louisiana. A sequential extraction method (SEDEX) was used to operationally separate the P pools into readily available P, Fe/Al-bound P, alkali extractable organic P, Ca/Mg-bound P, and residual/refractory P phases. Samples were analyzed for total metals (Ca, Mg, Fe, Al) and total organic carbon to quantify their association with different forms of P. In general, TP was well correlated to the concentrations of Mg (p<0.05). The concentrations of available P, alkali extractable organic P, and refractory P higher in deep sea sediments, while the shelves sediments had higher concentrations of Fe/Al-bound P. Total phosphorus (TP) concentrations ranged between 425 to 1883 mg/kg. Available P was the smallest pool (<1% of TP), while Ca/Mg-bound P was the most abundant (~80% of TP) pool. Phosphorous sedimentary fractions can provide us with the insights into burial, digenesis and residence time of P in the coastal sediments in the northern Gulf of Mexico. The flux of P from bottom sediments provides an additional source of P to the nitrogen-rich water column that can stimulate algal growth, ultimately contributing to hypoxia in coastal Louisiana.

  5. Analysis of six groups of zooplankton in samples taken in 1978/79 at the proposed OTEC site in the Eastern Gulf of Mexico off Tampa Bay

    SciTech Connect

    Flock, M.E.; Hopkins T.L.

    1981-05-01

    Zooplankton populations have been sampled from various depths in the region of the proposed Ocean thermal energy conversion site in the Gulf of Mexico. Data are presented on the numbers and species present at each depth sampled. (DMC)

  6. Active diapirism and slope steepening, northern Gulf of Mexico continental slope.

    USGS Publications Warehouse

    Martin, R.G.; Bouma, A.H.

    1982-01-01

    Large diapiric and nondiapiric masses of Jurassic salt and Tertiary shale underlie the northern Gulf of Mexico continental slope and adjacent outer continental shelf. Local steepening of the sea floor in response to the vertical growth of these structures is a serious concern to those involved in the site selection and the construction of future oil and gas production and transportation facilities in this frontier petroleum province. The evidence given in this paper supports the conclusion that the present continental slope region of the northern Gulf of Mexico is undergoing active diapirism and consequent slope steepening. Because most of the sediment on the flanks of diapiric structures consists of underconsolidated muds, slumping will take place regularly in response to further diapiric movement.-from Authors

  7. Introduction to "northern Gulf of Mexico ecosystem change and hazards susceptibility"

    USGS Publications Warehouse

    Brock, J.C.; Lavoie, D.L.; Poore, R.Z.

    2009-01-01

    The northern Gulf of Mexico and its diverse natural resources are threatened by population and development pressure, and by the impacts of rising sea level and severe storms. In the wake of the devastating 2005 hurricane season, and in response to the complex management issues facing the region, the U.S. Geological Survey organized the multidisciplinary "Northern Gulf of Mexico Ecosystem Change and Hazards Susceptibility" project. This special issue of Geo-Marine Letters hosts a few of the early results in the form of 11 papers covering three themes: (1) the control exerted by the underlying geologic framework on geomorphology and nearshore processes and features; (2) impact of human activities on nearshore water quality; and (3) hurricanes and associated effects. ?? 2009 US Government.

  8. What Lagrangian Trajectories Reveal about Deep Circulation in the Western Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Furey, H. H.; Bower, A. S.; Perez-Brunius, P.; Hamilton, P.; Leben, R. R.

    2016-02-01

    A major Lagrangian program is underway to map the deep (1500-2500) circulation of the entire Gulf of Mexico. From 2011 through 2015, 180 two-year acoustically-tracked RAFOS floats were released across the Gulf, many in pairs and triplets. In the western Gulf, the float trajectories reveal a slow persistent deep boundary current along the Gulf boundary, from the Mississippi Fan to the eastern Campeche Bank. Trajectories show that this boundary current is interrupted, or split, mid-traverse of the Campeche Bank slope, as an accelerating jet separates and turns northward, into the interior Gulf. The trajectories show the first-ever observations of deep energetic anticyclonic eddies (possibly lenses) forming at and separating from this northeastward-flowing current. This eddy formation region appears to be a major exchange site between the deep boundary current along the Mexican continental slope and the interior Gulf. The pathways of the deep trajectories also challenge the idea of deep closed-streamline cyclonic circulation under the Campeche Gyre.

  9. Deep Eddies and Cross-Slope Exchange in the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Furey, Heather; Bower, Amy; Perez-Brunius, Paula; Hamilton, Peter

    2015-04-01

    A major Lagrangian program is currently underway to map the deep (1500-2500) circulation of the entire Gulf of Mexico. Beginning in 2011, more than 120 acoustically tracked RAFOS floats have been released in the eastern, central and western Gulf, many in pairs and triplets. The floats are programmed to drift for two years, obtaining position fixes and temperature/pressure measurements three times daily. The trajectories will be described with a focus on mesoscale eddying behavior as it relates to cross-slope exchange. In particular, the first-ever observations of deep energetic anticyclonic eddies (possibly lenses) forming at and separating from a northeastward-flowing boundary current west of Campeche Bank will be discussed. The existence of this eddy formation region has major implications for exchange between the newly-observed deep boundary current along the Mexican continental slope and the interior Gulf. The Campeche Bank exchange region appears to be the dominant deep pathway from the boundary into the western Gulf for heat, salt, and nutrients, and also for oil spill pollutants. Cross-slope exchange via eddies is also seen in other regions of the Gulf, and will be presented. The project is being supported by the U.S. Bureau of Ocean Energy Management (BOEM).

  10. Lead in clams and fish of dietary importance from Coatzacoalcos estuary (Gulf of Mexico), an industrialized tropical region.

    PubMed

    Ruelas-Inzunza, J; Gárate-Viera, Y; Páez-Osuna, F

    2007-11-01

    With the aim of knowing seasonal variability of lead in fish and bivalve species from Coatzacoalcos estuary, biota collected during three seasons was examined. In muscle tissue of fish, the highest level (5.4 microg g(-1)) was found in the longnose gar Lepisosteus osseus from San Francisco stream (a highly impacted site); the lowest value (0.2 microg g(-1)) was registered in yellowfin mojarra Gerres cinereus from Ostión lagoon (control site). In bivalves, concentrations in soft tissue ranged from 1.5 microg g(-1) in Polymesoda caroliniana from Calzadas river, to 0.1 microg g(-1) in Corbicula fluminea from Hidalgotitlán (control site).

  11. Sources and Cycling of CDOM and DOC in the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Coble, P. G.; Conmy, R. N.

    2008-12-01

    The distribution and cycling of colored dissolved organic matter (CDOM) is of importance to the study of biogeochemical cycling of carbon and other elements in the ocean as well as to ocean optics due to its strong absorption of UV and short wavelength visible light. The absorption properties of gelbstoff make it photo-chemically active and also make it a controlling factor in the quality and quantity of light available for photosynthesis in the coastal ocean. Much of the variability of CDOM distribution in the ocean occurs nearshore, due to differences in riverine CDOM concentrations and discharge. CDOM and DOC sometimes show a correlation in regions where DOC concentrations are controlled by freshwater discharge. The Gulf of Mexico plays a key role in the North American Carbon cycle, draining more than 60% of the U.S. and more than 40% of Mexico, with freshwater input from 33 major river systems as well as from submarine groundwater discharge. Over the eight year period between 1998 and 2005, we have collected more than 1,000 CDOM samples 34 cruises in the region between the Mississippi River and the Florida Keys. We have also sampled 10 major river systems over multi-year periods. The major factors controlling CDOM distributions in the Gulf of Mexico are river of origin, hydrographic factors such as floods and droughts, and circulation on the shelf. Rivers in southern Florida have higher CDOM concentrations than those in the west central and southwest regions, which are higher than those found in the Mississippi River water. Dry seasons and drought years are characterized by high fluorescence efficiencies due to photobleaching. High CDOM, high salinity water masses are produced in the hypersaline waters of Florida Bay and from coastal upwelling of near-bottom waters along the shelf in the region of Charlotte Harbor. This paper will present a compilation and summary of CDOM and DOC distributions and analysis of the key controlling factors for the eastern Gulf of

  12. Microbiology of Massive Gas Hydrates from the Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Lanoil, B. D.; Sassen, R.; La Duc, M. T.; Sweet, S. T.; Nealson, K. H.

    2001-12-01

    Although there is significant interest in the potential interactions of microbes with gas hydrate, no direct physical association between them has been demonstrated. We examined several intact samples of naturally occurring gas hydrate from the Gulf of Mexico for evidence of microbes. All samples were collected from anaerobic hemipelagic mud within the gas hydrate stability zone, at water depths in the ca. 540 to 2000 m range. The \\delta13C of hydrate bound methane varied from -45.1 to -74.7 parts per mil compared to the Pee-Dee Belemnite standard, reflecting different gas origins. Stable isotope composition data indicated microbial consuption of methane or propane in some of the samples. Evidence of the presence of microbes was initially determined by DAPI total direct counts of hydrate-associated sediments (mean = 1.5 x 10^{9} cells g-1) and gas hydrate (mean = 1.0 x 10^{6} cells g$^{-1}). Small-subunit rRNA phylogenetic characterization was performed to assess the composition of the microbial community in one gas hydrate sample (AT425) that had no detectable associated sediment and showed evidence of microbial methane consumption. Bacteria were moderately diverse within AT425, and were dominated by gene sequences related to several groups of Proteobacteria, as well as Actinobacteria and low G+C Firmicutes. In contrast, there was low diversity of Archaea, nearly all of which were related to methanogenic Archaea, with the majority specifically related to Methanosaeta spp. The results of this study suggest that there is a direct association between microbes and gas hydrate, a finding that may have significance for hydrocarbon flux into the Gulf of Mexico and for life in extreme environments.

  13. BIOGEOGRAPHY OF BENTHIC MACROINVERTEBRATES IN ESTUARIES ALONG THE GULF OF MEXICO AND WESTERN ATLANTIC COASTS

    EPA Science Inventory

    The community composition of benthic macroinvertebrates from 870 estuarine sites was examined to determine boundaries of biogeographical provinces along the Gulf of Mexico and western Atlantic coasts of the United States. Our objective was to confirm or challenge established boun...

  14. Parameter sensitivity and identifiability for a biogeochemical model of hypoxia in the northern Gulf of Mexico

    EPA Science Inventory

    Local sensitivity analyses and identifiable parameter subsets were used to describe numerical constraints of a hypoxia model for bottom waters of the northern Gulf of Mexico. The sensitivity of state variables differed considerably with parameter changes, although most variables ...

  15. Coral communities of the deep Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Cordes, Erik E.; McGinley, Michael P.; Podowski, Elizabeth L.; Becker, Erin L.; Lessard-Pilon, Stephanie; Viada, Stephen T.; Fisher, Charles R.

    2008-06-01

    Habitat formation by foundation species is a major ecological force affecting community structure in numerous systems. On the upper continental slope of the Gulf of Mexico, the cold-water scleractinian coral Lophelia pertusa creates complex habitat on cold seep-associated carbonates. In this study, the communities associated with the cold-water coral L. pertusa are described from the Gulf of Mexico for the first time. A total of 68 taxa was identified in close association with the coral framework. Three species with specific relationships to L. pertusa were identified: Eunice sp., a polychaete which may facilitate colony formation in L. pertusa; Coralliophila sp., a species of corallivorous gastropod ; and Stenopus sp., a decapod crustacean which may act in a cleaner shrimp role in these habitats. Similarity among coral-associated communities was best explained by similarity in depth of collection and the proportion of live coral in the collections. These variables were somewhat confounded with location as the sites to the east were both shallower and contained higher proportions of live coral; however, distance between collections per se was not as significant in the analyses. The coral-associated communities also showed a low degree of similarity to communities inhabiting vestimentiferan tubeworm aggregations that occur nearby at the same sites. The increased habitat heterogeneity in the coral structure, differences in the niches constructed by the two foundation species, and different direct interspecific interactions between foundation species and members of the associated community contributed to the presence of dissimilar communities in these two biogenic habitats.

  16. Exploring Linkages Between Gulf of Mexico Sea Surface Conditions and North American Hydroclimate during the Holocene

    NASA Astrophysics Data System (ADS)

    Richey, J. N.; Thirumalai, K.; Quinn, T. M.; Poore, R. Z.

    2015-12-01

    The Gulf of Mexico is part of the Atlantic Warm Pool, a feature that drives oceanic moisture flux to the surrounding continent. It is connected to the North Atlantic Ocean via the loop current, which transports salt and heat from the Caribbean and Gulf of Mexico poleward via the Gulf Stream. As such, variations in Gulf of Mexico sea surface temperature (SST) and salinity (SSS) are linked to changes in North Atlantic Ocean circulation and North American hydroclimate. Although SST and SSS variability in the Gulf of Mexico are well understood on inter-annual and glacial-interglacial timescales, little is known about centennial scale variability in these sea surface parameters through the Holocene. We present here the first continuous multi-decadal resolution time series of SST and SSS spanning the entire Holocene from the Gulf of Mexico. This proxy reconstruction is based on paired measurements of Mg/Ca and δ18O in the planktic foraminifer, Globigerinoides ruber (white variety) in the Garrison Basin. Using these data, in combination with additional Gulf of Mexico SST and SSS records from the late Holocene, we explore linkages between North American precipitation patterns and ocean circulation on centennial timescales.

  17. Glacial meltwater cooling of the Gulf of Mexico - GCM implications for Holocene and present-day climates

    NASA Technical Reports Server (NTRS)

    Oglesby, Robert J.; Maasch, Kirk A.; Saltzman, Barry

    1989-01-01

    The NCAR Community Climate Model GCM is presently used to investigate the possible effects on regional and hemispheric climates of reduced SSTs in the Gulf of Mexico, in view of delta-O-18 records and terrestrial evidence for at least two major glacial meltwater discharges after the last glacial maximum. Three numerical experiments have been conducted with imposed gulfwide SST coolings of 3, 6, and 12 C; in all cases, significant reductions arise in the North Atlantic storm-track intensity, together with a strong decrease in transient eddy water vapor transport out of the Gulf of Mexico. Other statistically significant changes occur across the Northern Hemisphere.

  18. Glacial meltwater cooling of the Gulf of Mexico - GCM implications for Holocene and present-day climates

    NASA Technical Reports Server (NTRS)

    Oglesby, Robert J.; Maasch, Kirk A.; Saltzman, Barry

    1989-01-01

    The NCAR Community Climate Model GCM is presently used to investigate the possible effects on regional and hemispheric climates of reduced SSTs in the Gulf of Mexico, in view of delta-O-18 records and terrestrial evidence for at least two major glacial meltwater discharges after the last glacial maximum. Three numerical experiments have been conducted with imposed gulfwide SST coolings of 3, 6, and 12 C; in all cases, significant reductions arise in the North Atlantic storm-track intensity, together with a strong decrease in transient eddy water vapor transport out of the Gulf of Mexico. Other statistically significant changes occur across the Northern Hemisphere.

  19. Hypoxia in the Northern Gulf of Mexico: Assessing the State of the Science

    EPA Pesticide Factsheets

    The presentations, panel summaries, agenda sessions transcripts, and papers prepared by session authors for the April 2006 Symposium on Hypoxia in the Northern Gulf of Mexico: Assessing the State of the Science.

  20. Early opening of initially closed Gulf of Mexico and central North Atlantic ocean

    SciTech Connect

    Van Siclen, D.C.

    1984-09-01

    This paper presents ideas on the early opening and evolution of the Gulf of Mexico and the central North Atlantic ocean. It discusses rifting activity, plate tectonics, magnetic anomalies, and the geologic time elements involved.

  1. DISTRIBUTION OF ORGANIC AND ORGANOMETALLIC COMPOUNDS IN SEDIMENTS FROM THE GULF OF MEXICO

    EPA Science Inventory

    In 1994, over 200 sediment samples were collected in accordance with EPA's Environmental Monitoring and Assessment (EMAP) probabilistic sampling protocol from coastal and estuarine locations in the Louisianian Province (Gulf of Mexico). Organic extracts of homogenized aliquots we...

  2. DISTRIBUTION OF ORGANIC AND ORGANOMETALLIC COMPOUNDS IN SEDIMENTS FROM THE GULF OF MEXICO

    EPA Science Inventory

    In 1994, over 200 sediment samples were collected in accordance with EPA's Environmental Monitoring and Assessment (EMAP) probabilistic sampling protocol from coastal and estuarine locations in the Louisianian Province (Gulf of Mexico). Organic extracts of homogenized aliquots we...

  3. 75 FR 9397 - Fisheries of the South Atlantic and the Gulf of Mexico; Southeastern Data, Assessment, and Review...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-03-02

    ... of Mexico; Southeastern Data, Assessment, and Review (SEDAR); Spiny Lobster AGENCY: National Marine... of SEDAR Webinars and Workshop for South Atlantic and Gulf of Mexico spiny lobster. SUMMARY: The SEDAR update of the assessment of the South Atlantic and Gulf of Mexico stock of spiny lobster...

  4. Nutrient delivery from the Mississippi River to the Gulf of Mexico and effects of cropland conservation

    USDA-ARS?s Scientific Manuscript database

    Excessive nutrients transported from the Mississippi River Basin have created an ecological disaster - Gulf of Mexico hypoxia. Also, in recent years, federal expenditures on agricultural conservation practices have received intense scrutiny. Partly driven by these factors, the USDA Conservation Ef...

  5. Directional Characteristics of the 1990-1999 Wave Information Studies. Gulf of Mexico Hindcast.

    DTIC Science & Technology

    1999-01-01

    Information Studies (WIS) Gulf of Mexico Level 3 Wave Hindcast produced at the Engineer Research and Development Center’s Coastal and Hydraulics Laboratory at the Waterways Experiment Station in Vicksburg, Mississippi.

  6. Gulf of Mexico Climate-History Calibration Study

    USGS Publications Warehouse

    Spear, Jessica W.; Poore, Richard Z.

    2010-01-01

    Reliable instrumental records of past climate are available for about the last 150 years only. To supplement the instrumental record, reconstructions of past climate are made from natural recorders such as trees, ice, corals, and microfossils preserved in sediments. These proxy records provide information on the rate and magnitude of past climate variability, factors that are critical to distinguishing between natural and human-induced climate change in the present. However, the value of proxy records is heavily dependent on calibration between the chemistry of the natural recorder and of the modern environmental conditions. The Gulf of Mexico Climate and Environmental History Project is currently undertaking a climate-history calibration study with material collected from an automated sediment trap. The primary focus of the calibration study is to provide a better calibration of low-latitude environmental conditions and shell chemistry of calcareous microfossils, such as planktic Foraminifera.

  7. 75 FR 39918 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-13

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); goliath grouper. AGENCY: National Marine... of SEDAR Workshop for South Atlantic and Gulf of Mexico goliath grouper. SUMMARY: The SEDAR assessments of the South Atlantic and Gulf of Mexico stocks of goliath grouper will consist of a series...

  8. 75 FR 20985 - Fisheries of the South Atlantic and Gulf of Mexico; Southeastern Data, Assessment, and Review...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-22

    ... Mexico; Southeastern Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine... of SEDAR 22 Gulf of Mexico yellowedge grouper and tilefish assessment webinar 1. SUMMARY: The SEDAR 22 assessments of the Gulf of Mexico stocks of yellowedge grouper and tilefish will consist of a...

  9. 75 FR 51983 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-08-24

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); Assessment Webinar for SEDAR 23 Goliath Grouper...), Commerce. ACTION: Notice of SEDAR 23 Gulf of Mexico and South Atlantic goliath grouper assessment webinar. SUMMARY: The SEDAR 23 assessment of the Gulf of Mexico and South Atlantic stock of goliath grouper...

  10. 75 FR 63810 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-10-18

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); Assessment Webinar 8 for SEDAR 22 Yellowedge... Administration (NOAA), Commerce. ACTION: Notice of SEDAR 22 Gulf of Mexico yellowedge grouper and tilefish assessment webinar 8. SUMMARY: The SEDAR 22 assessments of the Gulf of Mexico stocks of yellowedge grouper...

  11. 75 FR 45605 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-08-03

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); assessment webinar 5 for SEDAR 22 yellowedge... Administration (NOAA), Commerce. ACTION: Notice of SEDAR 22 Gulf of Mexico yellowedge grouper and tilefish assessment webinar 5. SUMMARY: The SEDAR 22 assessments of the Gulf of Mexico stocks of yellowedge grouper...

  12. 76 FR 81479 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-28

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); Spanish Mackerel and Cobia AGENCY: National...: Notice of SEDAR Workshops for South Atlantic and Gulf of Mexico Spanish mackerel and cobia. SUMMARY: The SEDAR assessments of the South Atlantic and Gulf of Mexico stocks of Spanish mackerel and cobia...

  13. 78 FR 59287 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Coastal Migratory Pelagic...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-09-26

    ... reduces the trip limit for the commercial sector of king mackerel in the eastern zone of the Gulf of Mexico (Gulf) in the northern Florida west coast subzone to 500 lb (227 kg) of king mackerel per day in... king mackerel resource. DATES: This rule is effective noon, local time, September 25, 2013,...

  14. 77 FR 52623 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Coastal Migratory Pelagic...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-30

    ... reduces the trip limit for the commercial sector of king mackerel in the eastern zone of the Gulf of Mexico (Gulf) in the northern Florida west coast subzone to 500 lb (227 kg) of king mackerel per day in... king mackerel resource. DATES: This rule is effective 12:01 a.m., local time, August 30, 2012,...

  15. Integrating pressure into fault seal analysis, US Gulf of Mexico

    SciTech Connect

    Niemann, J.C.; Krolow, M.R. )

    1996-01-01

    Pressure differences between fault blocks can be an important indicator of fault seal or leak. However, bottom hole pressure data for formations of interest, commonly is limited or unavailable. A method is proposed for using shale porosity log-derived and calculated pressure gradient values to correlate and map pressure differences along fault zones. These pressure differentials are integrated with more conventional [open quote]Allan Map[close quote] projection and Smear/Gouge calculation techniques to evaluate fault seal in a number of moderate to highly overpressured Gulf of Mexico oil and gas fields. The results suggest this method can reveal a very detailed picture of fluid and pressure history to aid in the prediction of sealing and leaking relationships along fault zones.

  16. Methanotrophic gastropods from a bathyal hydrocarbon seep, Gulf of Mexico

    SciTech Connect

    Anderson, L.C.; Aharon, P.; Gupta, S. )

    1992-01-01

    Two gastropods, Neritina sp. and Truncatella sp., collected live from a Gulf of Mexico active gas seep with the submersible Johnson Sea Link in September 1991, apparently incorporate methane-derived carbon in their soft tissues. Flesh of an individual Neritina sp. had a delta C-13 of [minus]50.92 per mil PDB, and that of two coexisting individuals of Truncatella sp. had values of [minus]45.11 and [minus]49.27 per mil. These isotope values are comparable to those reported for the methanotrophic mytilid bivalve Bathymodiolus sp. from other hydrocarbon seeps on the Gulf of Mexico, and are lighter than published isotopic values of chemosynthetic organisms with sulfur-oxidizing symbionts. The anomalously light carbon-isotopic values of Neritina sp. and Truncatella sp. may steam from one of three causes: (1) these gastropods host symbiotic methanotrophic bacteria, (2) their chief food is methane-oxidizing bacteria present at the seep, or (3) they incorporate some carbon from the periostracum of mussels on which they may graze. The presence of abundant juveniles of Bathymodiolus, reported to settle preferentially in areas of active seepage and high methane release, indicates that methane was abundant and supported a community with multiple trophic levels. Generally, studies of hydrocarbon-seep communities have focused on larger community members, especially bivalves and tube worms. The presence of living Neritina and Truncatella at the authors sampling site, however, draws attention to the fact that these gastropods are integral and significant parts of hydrocarbon-seep communities. Both gastropod species are members of genera that characteristically inhabit shallow marine, intertidal, and semiterrestrial environments. The presence of these genera in bathyal hydrocarbon seeps indicates that they have very broad environmental ranges, thus limiting their utility in paleoecologic reconstructions.

  17. Gulf of Mexico Restoration and Protection Act

    THOMAS, 111th Congress

    Sen. Wicker, Roger F. [R-MS

    2009-06-19

    Senate - 08/02/2010 Placed on Senate Legislative Calendar under General Orders. Calendar No. 501. (All Actions) Tracker: This bill has the status IntroducedHere are the steps for Status of Legislation:

  18. Gulf of Mexico satellite radar altimetry

    NASA Technical Reports Server (NTRS)

    Parra, C. G.; Forsythe, R. G.; Parsons, C. L.

    1981-01-01

    The dynamic topography of the sea surface was measured. The radar altimeter measurements yield average ocean topographic data which are mapped. Seasonal deviations from a 3 year mean topography are presented. The altimeters are also instrumented with sample and hold gates which provide information about the shape and amplitude of the return waveform. Parameters including ocean surface wind speed and the significant wave height are determined. One hundred eighty six wind speed and significant wave height histograms are presented.

  19. Seagrass status and trends in the northern Gulf of Mexico: 1940-2002

    USGS Publications Warehouse

    Handley, L.; Altsman, D.; DeMay, R.

    2007-01-01

    Over the past century, seagrass habitats from the bays of Texas to the gulf shores of Florida have decreased. Seagrass beds, which are highly dependent on water quality and clarity for survival, are home to a multitude of aquatic plants and animals and a source of economic activity through commercial and recreational fishing and ecotourism. The U.S. Environmental Protection Agency’s Gulf of Mexico Program (GMP) and its partners have made a commitment to restore, enhance, and protect this important ecosystem. As seagrass habitats decrease, the need for information on the causes and effects of seagrass loss, current mapping information, and education on the importance of seagrassess becomes greater. This report is the initial effort of the GMP’s research and restoration plan for seagrasses. The purpose of this report is to provide scientists, managers, and citizens with valuable baseline information on the status and trends of seagrasses in coastal waters of the Gulf of Mexico. Within the northern Gulf of Mexico region, 14 individual estuarine systems where seagrasses occur, as well as statewide summaries for Texas, Louisiana, Mississippi, Alabama, and Florida, are examined in this study. Each estuarine system is detailed in vignettes that address current and historical extent and quality of seagrasses, seagrass mapping and monitoring, causes of status change, restoration and enhancement activities, background information for the entire study area as well as the subareas for study, and the methodology employed to analyze and document the historical trends and current status of seagrasses. The systems, moving from west to east, include the Laguna Madre, Texas Coastal Bend region, and Galveston Bay in Texas; the Chandeleur Islands in Louisiana; the Mississippi Sound; and Perdido Bay, Pensacola/Escambia Bay, Choctawhatchee Bay, St. Andrew Bay, Florida’s Big Bend region, Tampa Bay/St. Joseph Sound, Sarasota Bay, Greater Charlotte Harbor, and Florida Bay in Florida

  20. 75 FR 72793 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-11-26

    ... 33607. FOR FURTHER INFORMATION CONTACT: Steven Atran, Population Dynamics Statistician; Gulf of Mexico... discussion on the use of judgment calls and use of mean catch to define the overfishing limit when setting...

  1. MULTIPLE REGRESSION MODELS FOR HINDCASTING AND FORECASTING MIDSUMMER HYPOXIA IN THE GULF OF MEXICO

    EPA Science Inventory

    A new suite of multiple regression models were developed that describe the relationship between the area of bottom water hypoxia along the northern Gulf of Mexico and Mississippi-Atchafalaya River nitrate concentration, total phosphorus (TP) concentration, and discharge. Variabil...

  2. Sediment Microbial Community Dynamics and Geochemistry During Oxic and Hypoxic Periods in the Gulf of Mexico

    EPA Science Inventory

    Seasonal hypoxia in the benthic waters of the Louisiana Coastal Shelf contributes to the Gulf of Mexico "dead zone" phenomena. Limited information is available on sedimentary biogeochemical interactions during periods of hypoxia.

  3. Sediment Microbial Community Dynamics and Geochemistry During Oxic and Hypoxic Periods in the Gulf of Mexico

    EPA Science Inventory

    Seasonal hypoxia in the benthic waters of the Louisiana Coastal Shelf contributes to the Gulf of Mexico "dead zone" phenomena. Limited information is available on sedimentary biogeochemical interactions during periods of hypoxia.

  4. MULTIPLE REGRESSION MODELS FOR HINDCASTING AND FORECASTING MIDSUMMER HYPOXIA IN THE GULF OF MEXICO

    EPA Science Inventory

    A new suite of multiple regression models were developed that describe the relationship between the area of bottom water hypoxia along the northern Gulf of Mexico and Mississippi-Atchafalaya River nitrate concentration, total phosphorus (TP) concentration, and discharge. Variabil...

  5. Astronaut Thomas Stafford during water egress training in Gulf of Mexico

    NASA Technical Reports Server (NTRS)

    1965-01-01

    Astronaut Thomas P. Stafford, Gemini 6 prime crew pilot, climbs out of a boilerplate model of a Gemini spacecraft during water egress training in the Gulf of Mexico. A NASA swimmer in the water nearby assists in the exercise.

  6. Coordinated Field Campaigns in Chesapeake Bay and Gulf of Mexico

    NASA Technical Reports Server (NTRS)

    Mannino, Antonio; Novak, Michael; Tzortziou, Maria A.

    2015-01-01

    NASA's GEOstationary Coastal and Air Pollution Events (GEO-CAPE) mission concept recommended by the U.S. National Research Council (2007) focuses on measurements of atmospheric trace gases and aerosols and aquatic coastal ecology and biogeochemistry from geostationary orbit (35,786 km altitude). Two GEO-CAPE-sponsored multi-investigator ship-based field campaigns were conducted to coincide with the NASA Earth Venture Suborbital project DISCOVER-AQ (Deriving Information on Surface conditions from Column and Vertically Resolved Observations Relevant to Air Quality) field campaigns: (1) Chesapeake Bay in July 2011 and (2) northwestern Gulf of Mexico in September 2013. Goal: to evaluate whether GEO-CAPE coastal mission measurement and instrument requirements are optimized to address science objectives while minimizing ocean color satellite sensor complexity, size and cost - critical mission risk reduction activities. NASA continues to support science studies related to the analysis of data collected as part of these coordinated field campaigns and smaller efforts.

  7. Operators log Gulf of Mexico E and D progress

    SciTech Connect

    Not Available

    1991-10-21

    This paper reports on a number of oil and gas companies that are marking progress in exploration and development in the Gulf of Mexico. Among recent action: FINA Inc., Dallas, and partners tested a significant natural gas fault block discovery in Vermilion Block 16 field off Louisiana. A group led by Seagull Energy Corp., expects to install about mid-1992 a 100 MMcfd production platform on Brazos Block 397 in about 80 ft of water 22 miles south of Freeport, Tex. A group led by Marathon Oil Co. expects to begin producing oil and gas by mid-1992 from wells on South Pass Blocks 86 and 89 about 12 miles off Louisiana. Nerco Oil and Gas Inc. and CNG Producing Co. started gas production from a platform in West Cameron Block 554 field. Nerco and AGIP Petroleum Co. drilled a successful delineation well in Vermillion Block 395, near where it plans to install a platform next month.

  8. Climate change and its potential impacts on the Gulf Coast region of the United States.

    PubMed

    Tchounwou, P B

    1999-01-01

    The Gulf Coast region of the United States abuts five states, including Alabama, Florida, Louisiana, Mississippi, and Texas. In general, the Gulf of Mexico has a surface area of 1.63 million square kilometers (630,000 square miles) and a watershed area of 4.69 million square kilometers (1.81 million square miles) in the United States. This region is one of the nation's largest ecological systems and is closely linked to a significant portion of the nation's economy. In the Gulf Coast region, energy, fisheries, agriculture, and tourism rank among the most significant sectors of the economy. The Gulf has five of the top ten fishing ports in the United States, and commercial fisheries in the Gulf annually produce nearly 2 billion tons of fish, oysters, shrimps, and crabs. Gulf ports handle one-half of the nation's import-export tonnage. Petroleum produced in the Gulf represents about 80% of the nation's offshore production. The Gulf Coast region largely relies on many natural resources to fuel many important sectors of its economy. But nevertheless, the health and vitality of the Gulf have declined in recent years, caused in part by increasing populations along its coast and the growing demand upon its resources and in part by the accumulation of years of careless depletion, abuse, and neglect of the environment. Equally important are the impacts of natural and human-induced climate change on the economy and on the quality of life for millions of people living in the Gulf Coast region. The results have generated alarming increases in damage to and destruction of the ecosystems and habitats of the Gulf. This paper reviews the nature of global environmental change and addresses the potential health and environmental impacts that may occur in the Gulf Coast region of the United States as a consequence of various environmental alterations resulting from global change.

  9. Quantitative Integrated Evaluation in the Mars Basin, Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Tichelaar, B. W.; Detomo, R.

    2005-05-01

    Today's exploitation of hydrocarbons in the Deepwater Gulf of Mexico requires a subtle, sophisticated class of opportunities for which uncertainties must be quantified to reduce risk. The explorer is often faced with non-amplitude supported hydrocarbon accumulations, limitations of seismic imaging, and uncertainty in stratigraphy and hydrocarbon kitchens, all in an environment of still-maturing technology and rising drilling costs. However, many of the fundamental Exploration processes that drove the industry in the past in the Gulf of Mexico still apply today. Integration of these historically proven processes with each other and with new technologies, supported by a growing body of knowledge, has provided a significant new methodology for wildcat and near-field Exploration. Even in mature fields, additional opportunities are seldom characterized by unambiguous attributes of direct hydrocarbon indicators or amplitude support. Shell's Quantitative Integrated Evaluation process relies upon visualization of integrated volume-based stratigraphic models of rock and fluid properties, and by relating these properties to measured and predicted seismic responses. An attribute referred to as the Differential Generalized Attribute, which summarizes the differences between multiple scenario response predictions and actual measured data, can then be used to distinguish likely scenarios from unlikely scenarios. This methodology allows competing scenarios to be rapidly tested against the data, and is built upon proprietary knowledge of the physical processes and relationships that likely drive vertical and lateral variation in these models. We will demonstrate the methodology by showing a portion of the Mars Basin and describing the integrated capability that is emplaced at the Exploration phase, and matured throughout the Appraisal, Development and Production life cycle of a basin discovery.

  10. Education Conference of the Gulf of Mexico Accord (1st, Daytona Beach, FL, September 28-30, 1995). Interim Report.

    ERIC Educational Resources Information Center

    Day, Philip R., Jr.

    Under the auspices of the North American Free Trade Agreement, five states in the United States and six states in Mexico established the Gulf of Mexico Accord to create a working partnership to foster economic development in the Gulf of Mexico. The agreement addresses six major sectors: investment; communication and transportation; health;…

  11. Vortices and Lagrangian Dispersion in the Western Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Zavala Sansón, L.

    2016-02-01

    By using sets of surface drifters released between 2007 and 2014, we describe two-particle statistics (relative dispersion and finite scale Lyapunov exponents) associated with mesoscale vortices at the western Gulf of Mexico. It is shown that dispersion regimes are strongly affected by the arrival of Loop Current Eddies (LCE), their collision with the western topography and the interaction with the semi-permanent cyclonic circulation at the Bay of Campeche. We shall discuss first some of these relevant processes to the light of altimetry observations, as well as of idealized laboratory and numerical experiments, which facilitate a physical interpretation. Secondly, we emphasize that Lagrangian dispersion properties must be measured by considering appropriate circulation scenarios given by the occurrence of mesoscale interactions. Relevant examples are the enhanced northward dispersion patterns, determined by the interaction of LCEs with the cyclonic structure at the Bay of Campeche, followed by a nearly full retention of drifters at the southern gulf, as the LCEs collide with the western boundary.

  12. 76 FR 18415 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Coastal Migratory Pelagic...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-04

    ... coast subzone to the commercial harvest of king mackerel in or from the exclusive economic zone (EEZ). This closure is necessary to protect the Gulf king mackerel resource. DATES: This rule is effective 12... pelagic fish (king mackerel, Spanish mackerel, cero, cobia, little tunny, and, in the Gulf of Mexico...

  13. Features observed in the Southern Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Monreal-Gomez, M. A.; Salas-de-Leon, D. A.

    2007-05-01

    The southern Gulf of Mexico has been studied at different scale. The analysis of dynamic topography shows a cyclonic eddy that dominates mesoscale circulation, its formation and westwards shift have been simulated by a numerical model as a result of the variation of the intensity of the Yucatan Current and the topography of the Bay of Campeche . There are hydrographic features of smaller scale such as topographical effect at the western margin of the Yucatan shelf which induce an uplift of cool water, and internal waves at the shelf edge. Over the Campeche canyon a subsurface anticyclonic-cyclonic eddy pair appears as well as an associated thermal front. On the other hand, the southern gulf coastal waters are influenced by river runoff, such as from the Grijalva- Usumacinta Rivers system, this runoff induces haline fronts and some times thermal and haline gradients occur with surface temperature and salinity increasing offshore, where low temperature and salinity values produce an inverse effect on water density.

  14. 49 CFR 192.612 - Underwater inspection and reburial of pipelines in the Gulf of Mexico and its inlets.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... the Gulf of Mexico and its inlets. 192.612 Section 192.612 Transportation Other Regulations Relating... Mexico and its inlets. (a) Each operator shall prepare and follow a procedure to identify its pipelines in the Gulf of Mexico and its inlets in waters less than 15 feet (4.6 meters) deep as measured from...

  15. 49 CFR 192.612 - Underwater inspection and reburial of pipelines in the Gulf of Mexico and its inlets.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... the Gulf of Mexico and its inlets. 192.612 Section 192.612 Transportation Other Regulations Relating... Mexico and its inlets. (a) Each operator shall prepare and follow a procedure to identify its pipelines in the Gulf of Mexico and its inlets in waters less than 15 feet (4.6 meters) deep as measured from...

  16. 49 CFR 192.612 - Underwater inspection and reburial of pipelines in the Gulf of Mexico and its inlets.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... the Gulf of Mexico and its inlets. 192.612 Section 192.612 Transportation Other Regulations Relating... Mexico and its inlets. (a) Each operator shall prepare and follow a procedure to identify its pipelines in the Gulf of Mexico and its inlets in waters less than 15 feet (4.6 meters) deep as measured from...

  17. 49 CFR 192.612 - Underwater inspection and reburial of pipelines in the Gulf of Mexico and its inlets.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... the Gulf of Mexico and its inlets. 192.612 Section 192.612 Transportation Other Regulations Relating... Mexico and its inlets. (a) Each operator shall prepare and follow a procedure to identify its pipelines in the Gulf of Mexico and its inlets in waters less than 15 feet (4.6 meters) deep as measured from...

  18. 49 CFR 192.612 - Underwater inspection and reburial of pipelines in the Gulf of Mexico and its inlets.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... the Gulf of Mexico and its inlets. 192.612 Section 192.612 Transportation Other Regulations Relating... Mexico and its inlets. (a) Each operator shall prepare and follow a procedure to identify its pipelines in the Gulf of Mexico and its inlets in waters less than 15 feet (4.6 meters) deep as measured from...

  19. Ambient Noise in the Western Gulf of Mexico.

    DTIC Science & Technology

    1982-03-11

    Gulf of Mexico for a clear, calm period has been analyzed. The receiver depths were 170 m, 370 m, and 766 m; the bottom was at 3280 m. It was found that the ambient noise was dominated most of the 12 h by seismic exploration. To avoid this noise, quiet periods between seismic domination were used; the median noise levels at 50 Hz were found to be around 75-77 dB//1 micro Pa/sq root(Hz) with the slightly higher levels at the SOFAR channel axis. Overall median levels were 77-80 dB//1 micro Pa/sq root(Hz). These levels are lower than the 85 dB levels for the

  20. 78 FR 79674 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-12-31

    ...The Gulf of Mexico Fishery Management Council (Council) will hold a meeting of the ABC Control Rule Working Group (Working Group) and Standing and Special Reef Fish Scientific and Statistical Committees (SSC).

  1. Environmental Conditions in northern Gulf of Mexico Estuaries: before and after the BP Oil Spill

    EPA Science Inventory

    This presentation provides a summary of ecological condition and sediment chemistry data for northern Gulf of Mexico estuaries that were exposed to oil and oil-related contaminants from the BP Oil Spill.

  2. Environmental Conditions in northern Gulf of Mexico Estuaries: before and after the BP Oil Spill

    EPA Science Inventory

    This presentation provides a summary of ecological condition and sediment chemistry data for northern Gulf of Mexico estuaries that were exposed to oil and oil-related contaminants from the BP Oil Spill.

  3. 75 FR 63146 - Gulf of Mexico Fishery Management Council; Public Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-10-14

    ... Management Council will convene a joint meeting of its Ecosystem Scientific and Statistical Committee & Socioeconomic Panel. DATES: The Ecosystem Scientific and Statistical Committee & Socioeconomic Panel meeting..., Ecosystem Management Specialist, Gulf of Mexico Fishery Management Council; telephone: (813) 348-1630...

  4. 76 FR 59373 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Generic Annual Catch Limits...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-09-26

    ...) for Reef Fish Resources, Red Drum, Shrimp, and Coral and Coral Reefs for the Gulf of Mexico (Gulf) for... Coral and Coral Reefs FMP. The majority of harvest of octocorals occurs in waters under the...

  5. 75 FR 35442 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR) Update; Greater...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-22

    ... National Oceanic and Atmospheric Administration RIN 0648-XX02 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR) Update; Greater Amberjack. AGENCY: National Marine Fisheries... and Gulf States Marine Fisheries Commissions have implemented the Southeast Data, Assessment...

  6. 75 FR 53951 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR) Update; Greater...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-02

    ... National Oceanic and Atmospheric Administration RIN 0648-XY63 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR) Update; Greater Amberjack AGENCY: National Marine Fisheries... and Gulf States Marine Fisheries Commissions have implemented the Southeast Data, Assessment...

  7. 77 FR 58526 - Gulf of Mexico Fishery Management Council; Public Hearings

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-09-21

    ... Management Council; telephone: (813) 348-1630 x231. For the gag Framework Action: Steven Atran, Population Dynamics Statistician, Gulf of Mexico Fishery Management Council; telephone: (813) 348-1630 x227...

  8. 77 FR 42699 - Gulf of Mexico Fishery Management Council; Public Hearings

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-07-20

    ..., Galveston and Corpus Christi, TX. Council address: Gulf of Mexico Fishery Management Council, 2203 N. Lois... Galveston, 5400 Seawall Boulevard, Galveston Island, TX 77551, telephone: (409) 744-5000; and Courtyard...

  9. 75 FR 14427 - Gulf of Mexico Fishery Management Council (Council); Public Meetings

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-03-25

    ...., Galveston, TX 77551. Council address: Gulf of Mexico Fishery Management Council, 2203 North Lois Avenue... update on the SEFSC Methodology for Age Composition for Red Drum. Although other non-emergency issues...

  10. GPS-Squitter Automatic Dependent Surveillance Broadcast: Flight Testing in the Gulf of Mexico,

    DTIC Science & Technology

    1995-10-13

    serviced by oil platform helicopters. The report concludes that GPS- Squitter is a near-term option for providing accurate, real-time surveillance of aircraft operating in the offshore airspace in the Gulf of Mexico .... of Mexico . Three squitter ground stations were located in the vicinity of Morgan City, Louisiana, for this evaluation: two were located on offshore...During November - December 1994, MIT Lincoln Laboratory conducted a field evaluation of the air surveillance capabilities of GPS-Squitter in the Gulf

  11. 77 FR 38586 - Fisheries of the South Atlantic and Gulf of Mexico; South Atlantic Fishery Management Council...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-06-28

    ... National Oceanic and Atmospheric Administration Fisheries of the South Atlantic and Gulf of Mexico; South... workshop. SUMMARY: The South Atlantic Fishery Management Council (SAFMC) will hold a meeting of its... meeting, the SSC will discuss Amendment 9 to the Shrimp FMP for the South Atlantic Region. The amendment...

  12. 76 FR 68310 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Snapper-Grouper Fishery Off the...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-11-04

    ... the Caribbean, Gulf of Mexico, and South Atlantic; Snapper-Grouper Fishery Off the Southern Atlantic...-Grouper Fishery of the South Atlantic Region (FMP). This rule makes effective the collection-of... number 0648-0603 (South Atlantic snapper- grouper reporting requirements), and on April 12, 2011,...

  13. 33 CFR 110.194b - Mississippi Sound and Gulf of Mexico, near Petit Bois Island, Miss.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Mexico, near Petit Bois Island, Miss. 110.194b Section 110.194b Navigation and Navigable Waters COAST... Mississippi Sound and Gulf of Mexico, near Petit Bois Island, Miss. (a) The anchorage grounds—(1) Explosives... center located at latitude 30°11′12″, longitude 88°30′07″, in the waters of Gulf of Mexico south of the...

  14. CEER 2014 Dedicated Session Proposal: Restoring Water Quality along with Restoring the Gulf of Mexico

    EPA Science Inventory

    This session focuses on the importance of restoring water quality as part of the larger Gulf of Mexico restoration efforts. Water quality has been identified as a significant indicator of water body condition, and Gulf waters have been impacted by increased urban development, agr...

  15. CEER 2014 Dedicated Session Proposal: Restoring Water Quality along with Restoring the Gulf of Mexico

    EPA Science Inventory

    This session focuses on the importance of restoring water quality as part of the larger Gulf of Mexico restoration efforts. Water quality has been identified as a significant indicator of water body condition, and Gulf waters have been impacted by increased urban development, agr...

  16. Differences in phosphorus and nitrogen delivery to the Gulf of Mexico from the Mississippi River Basin.

    PubMed

    Alexander, Richard B; Smith, Richard A; Schwarz, Gregory E; Boyer, Elizabeth W; Nolan, Jacqueline V; Brakebill, John W

    2008-02-01

    Seasonal hypoxia in the northern Gulf of Mexico has been linked to increased nitrogen fluxes from the Mississippi and Atchafalaya River Basins, though recent evidence shows that phosphorus also influences productivity in the Gulf. We developed a spatially explicit and structurally detailed SPARROW water-quality model that reveals important differences in the sources and transport processes that control nitrogen (N) and phosphorus (P) delivery to the Gulf. Our model simulations indicate that agricultural sources in the watersheds contribute more than 70% of the delivered N and P. However, corn and soybean cultivation is the largest contributor of N (52%), followed by atmospheric deposition sources (16%); whereas P originates primarily from animal manure on pasture and rangelands (37%), followed by corn and soybeans (25%), other crops (18%), and urban sources (12%). The fraction of in-stream P and N load delivered to the Gulf increases with stream size, but reservoir trapping of P causes large local- and regional-scale differences in delivery. Our results indicate the diversity of management approaches required to achieve efficient control of nutrient loads to the Gulf. These include recognition of important differences in the agricultural sources of N and P, the role of atmospheric N, attention to P sources downstream from reservoirs, and better control of both N and P in close proximity to large rivers.

  17. Differences in phosphorus and nitrogen delivery to the Gulf of Mexico from the Mississippi River Basin

    USGS Publications Warehouse

    Alexander, R.B.; Smith, R.A.; Schwarz, G.E.; Boyer, E.W.; Nolan, J.V.; Brakebill, J.W.

    2008-01-01

    Seasonal hypoxia in the northern Gulf of Mexico has been linked to increased nitrogen fluxes from the Mississippi and Atchafalaya River Basins, though recent evidence shows that phosphorus also influences productivity in the Gulf. We developed a spatially explicit and structurally detailed SPARROW water-quality model that reveals important differences in the sources and transport processes that control nitrogen (N) and phosphorus (P) delivery to the Gulf. Our model simulations indicate that agricultural sources in the watersheds contribute more than 70% of the delivered N and P. However, corn and soybean cultivation is the largest contributor of N (52%), followed by atmospheric deposition sources (16%); whereas P originates primarily from animal manure on pasture and rangelands (37%), followed by corn and soybeans (25%), other crops (18%), and urban sources (12%). The fraction of in-stream P and N load delivered to the Gulf increases with stream size, but reservoir trapping of P causes large local- and regional-scale differences in delivery. Our results indicate the diversity of management approaches required to achieve efficient control of nutrient loads to the Gulf. These include recognition of important differences in the agricultural sources of N and P, the role of atmospheric N, attention to P sources downstream from reservoirs, and better control of both N and P in close proximity to large rivers. ?? 2008 American Chemical Society.

  18. Collinear-Track Altimetry in the Gulf of Mexico from SEASAT: Measurements, Models and Surface Truth.

    DTIC Science & Technology

    1982-06-01

    From 17 September to 10 October 1978 SEASAT made collinear passes over the Gulf of Mexico . Altimeter data for eight, three-day repeat passes over the eastern Gulf were examined using an arc-segment fitting technique to determine the mesoscale temporal variability of the sea surface. The pattern of sea height variability was then compared with sea height data generated by a numerical model of the Gulf (Hurlburt and Thompson, 1980) from the

  19. 77 FR 50642 - Spiny Lobster Fishery of the Gulf of Mexico and South Atlantic; Amendment 11; Correction

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-22

    ... National Oceanic and Atmospheric Administration 50 CFR Part 640 RIN 0648-BB44 Spiny Lobster Fishery of the... Management Plan for the Spiny Lobster Fishery in the Gulf of Mexico and South Atlantic Regions that published...: Correction On July 27, 2012 (77 FR 44168, July 27, 2012), incorrect latitudinal coordinates for Lobster...

  20. 76 FR 12605 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Snapper-Grouper Fishery Off the...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-08

    ..., Gulf of Mexico, and South Atlantic; Snapper-Grouper Fishery Off the Southern Atlantic States; Amendment...-Grouper Fishery of the South Atlantic Region (Amendment 17B), which was published in the Federal Register... rule established annual catch limits and accountability measures for nine snapper-grouper species...