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Petrographic, Mineralogic, and Geochemical Studies of Hydrocarbon-derived Authigenic Carbonate Rock from Gas Venting, Seepage, Free Gas, and Gas Hydrate Sites in the Gulf of Mexico and offshore India
(2012-02-14)
Authigenic carbonate rock (ACR) is derived from microbial oxidation of methane, biodegradation of crude oil, and oxidation of sedimentary organic matter. The precipitation of ACR was characterized petrographically, ...
Centennial-Scale Sea Surface Temperature and Salinity Variability in the Florida Straits During the Early Holocene
(2012-10-19)
Previous studies showed that sea surface salinity (SSS) in the Florida Straits as well as Florida Current transport covaried with changes in North Atlantic climate over the past two millennia. However, little is known about ...
Linking Molecular Microbiology and Geochemistry to Better Understand Microbial Ecology in Coastal Marine Sediments
(2012-02-14)
The overall objective of the research presented here was to combine multiple geochemical parameters and molecular characterizations to provide a novel view of active microbial community ecology of sediments in a large-river ...
Dissolved Organic Matter Cycling on the Louisiana Shelf: Implications for the Formation of Hypoxia
(2012-02-14)
Although there has been considerable work on the role of nutrient-derived (mostly nitrate) primary production in fueling hypoxia in northern Gulf of Mexico, very little is known about the relative importance of autochthonous ...
Ground Truthing Sargassum in Satellite Imagery: Assessment of Its Effectiveness as an Early Warning System
(2012-02-14)
Large aggregations of Sargassum, when at sea, provide important habitat for numerous marine species of vertebrates and invertebrates. It is especially important for the young of several species of sea turtles. However, ...
Statistical and Realistic Numerical Model Investigations of Anthropogenic and Climatic Factors that Influence Hypoxic Area Variability in the Gulf of Mexico
(2012-07-16)
The hypoxic area in the Gulf of Mexico is the second largest in the world, which has received extensive scientific study and management interest. Previous modeling studies have concluded that the increased hypoxic area in ...
Extreme wave height estimation for ocean engineering applications in the Gulf of Mexico
(2012-07-16)
Recent hurricanes in the Gulf of Mexico (e.g., Ivan, Dennis, Katrina, Rita and Ike) were observed to develop wave conditions that were near or exceeded the predicted 100-year conditions. As a result, many offshore facilities, ...
Coastal and Marine Nitrogen Sources Shift Isotopic Baselines in Pelagic Food Webs of the Gulf of Mexico
(2012-07-16)
Upwelling, atmospheric nitrogen (N2) fixation by cyanobacteria, and freshwater inputs from the Mississippi River system have been shown to stimulate new production by alleviating nitrogen (N) limitation in the northern ...
Aquatic macrophyte and animal communities in a recently restored brackish marsh: possible influences of restoration design and the invasive plant species Myriophyllum spicatum
(2012-07-16)
The numerous benefits that wetlands provide make them essential to ecosystem services and ecological functions. Historically, wetland losses have been caused by natural and anthropogenic changes. In Texas, nearly 50% of ...
Standing Stocks and Faunal Zonation of Deep-Sea Benthos: Patterns and Predictions across Scales
(2012-07-16)
The deep ocean (> 200-m depth) covers more than 65 percent of earth's surface and is known as the largest active carbon sink of the planet. Photosynthesis fixes inorganic carbon into organic rich-compounds to fuel the ...