scholarly journals Near-surface stratigraphy and morphology, Mississippi Inner Shelf, northern Gulf of Mexico

2015 ◽  
Author(s):  
James G. Flocks ◽  
Jack Kindinger ◽  
Kyle W. Kelso ◽  
Julie C. Bernier ◽  
Nancy T. DeWitt ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Inner Shelf ◽  
Near Surface ◽  
Northern Gulf Of Mexico

scholarly journals Seasonal Mixing and Biological Controls of the Carbonate System in a River-Dominated Continental Shelf Subject to Eutrophication and Hypoxia in the Northern Gulf of Mexico

2021 ◽  
Vol 8 ◽  
Author(s):  
Wei-Jen Huang ◽  
Wei-Jun Cai ◽  
Xinping Hu
Keyword(s):  
Gulf Of Mexico ◽  
Continental Shelf ◽  
Dissolved Inorganic Carbon ◽  
Time Lag ◽  
Distribution Patterns ◽  
Detailed Examination ◽  
Total Alkalinity ◽  
Dominant Factor ◽  
Near Surface ◽  
Northern Gulf Of Mexico

Large rivers export a large amount of dissolved inorganic carbon (DIC) and nutrients to continental shelves; and subsequent river-to-sea mixing, eutrophication, and seasonal hypoxia (dissolved oxygen < 2 mg⋅L–1) can further modify DIC and nutrient distributions and fluxes. However, quantitative studies of seasonal carbonate variations on shelves are still insufficient. We collected total alkalinity (TA), DIC, and NO3– data from nine cruises conducted between 2006 and 2010 on the northern Gulf of Mexico continental shelf, an area strongly influenced by the Mississippi and Atchafalaya Rivers. We applied a three-end-member model (based on salinity and potential alkalinity) to our data to remove the contribution of physical mixing to DIC and nitrate distribution patterns and to derive the net in situ removal of DIC and nitrate (ΔDIC and ΔNO3–, respectively). Systematic analyses demonstrated that the seasonal net DIC removal in the near-surface water was strong during summer and weak in winter. The peak in net DIC production in the near-bottom, subsurface waters of the inner and middle sections of the shelf occurred between July and September; it was coupled, but with a time lag, to the peak in the net DIC removal that occurred in the near-surface waters in June. A similar 2-month delay (i.e., January vs. November) could also be observed between their minima. A detailed examination of the relationship between ΔDIC and ΔNO3– demonstrates that net biological activity was the dominant factor of DIC removal and addition. Other effects, such as air–sea CO2 gas exchange, wetland exports, CaCO3 precipitation, and a regional variation of the Redfield ratio, were relatively minor. We suggest that the delayed coupling between eutrophic surface and hypoxic bottom waters reported here may also be seen in the carbon and nutrient cycles of other nutrient-rich, river-dominated ocean margins worldwide.

Observations of inner shelf cross-shore surface material transport adjacent to a coastal inlet in the northern Gulf of Mexico

2017 ◽  
Vol 137 ◽  
pp. 142-153 ◽  
Author(s):  
Mathias K. Roth ◽  
Jamie MacMahan ◽  
Ad Reniers ◽  
Tamay M. Özgökmen ◽  
Kate Woodall ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Surface Material ◽  
Material Transport ◽  
Inner Shelf ◽  
Northern Gulf Of Mexico ◽  
Coastal Inlet

scholarly journals The SailBuoy remotely-controlled unmanned vessel: Measurements of near surface temperature, salinity and oxygen concentration in the Northern Gulf of Mexico

2014 ◽  
Vol 10 ◽  
pp. 104-121 ◽  
Author(s):  
Mahmud Hasan Ghani ◽  
Lars R. Hole ◽  
Ilker Fer ◽  
Vassiliki H. Kourafalou ◽  
Nicolas Wienders ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Surface Temperature ◽  
Oxygen Concentration ◽  
Near Surface ◽  
Northern Gulf Of Mexico

Effects of hypoxia on habitat quality of pelagic planktivorous fishes in the northern Gulf of Mexico

2014 ◽  
Vol 505 ◽  
pp. 209-226 ◽  
Author(s):  
H Zhang ◽  
DM Mason ◽  
CA Stow ◽  
AT Adamack ◽  
SB Brandt ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Habitat Quality ◽  
Northern Gulf Of Mexico
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