scholarly journals Deglacial nitrogen isotope changes in the Gulf of Mexico: Evidence from bulk sedimentary and foraminifera‐bound nitrogen in Orca Basin sediments

2011 ◽  
Vol 26 (4) ◽  
Author(s):  
A. Nele Meckler ◽  
Haojia Ren ◽  
Daniel M. Sigman ◽  
Nicolas Gruber ◽  
Birgit Plessen ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Nitrogen Isotope ◽  
Orca Basin

scholarly journals Vertical marine snow distribution in the stratified, hypersaline, and anoxic Orca Basin (Gulf of Mexico)

Elem Sci Anth ◽  
2019 ◽  
Vol 7 ◽  
Author(s):  
Arne Diercks ◽  
Kai Ziervogel ◽  
Ryan Sibert ◽  
Samantha B. Joye ◽  
Vernon Asper ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Gulf Of Mexico ◽  
Particle Number ◽  
Sea Surface ◽  
Marine Snow ◽  
Particle Volume ◽  
Total Particle Number ◽  
Total Particle ◽  
Snow Distribution ◽  
Orca Basin

We present a complete description of the depth distribution of marine snow in Orca Basin (Gulf of Mexico), from sea surface through the pycnocline to within 10 m of the seafloor. Orca Basin is an intriguing location for studying marine snow because of its unique geological and hydrographic setting: the deepest ~200 m of the basin are filled with anoxic hypersaline brine. A typical deep ocean profile of marine snow distribution was observed from the sea surface to the pycnocline, namely a surface maximum in total particle number and midwater minimum. However, instead of a nepheloid (particle-rich) layer positioned near the seabed, the nepheloid layer in the Orca Basin was positioned atop the brine. Within the brine, the total particle volume increased by a factor of 2–3 while the total particle number decreased, indicating accumulation and aggregation of material in the brine. From these observations we infer increased residence time and retention of material within the brine, which agrees well with laboratory results showing a 2.2–3.5-fold reduction in settling speed of laboratory-generated marine snow below the seawater-brine interface. Similarly, dissolved organic carbon concentration in the brine correlated positively with measured colored dissolved organic matter (r2 = 0.92, n = 15), with both variables following total particle volume inversely through the pycnocline. These data indicate the release of dissolved organic carbon concomitant with loss in total particle volume and increase in particle numbers at the brine-seawater interface, highlighting the importance of the Orca Basin as a carbon sink.

Formation of hematite in the euxinic Orca Basin, northern Gulf of Mexico

1986 ◽  
Vol 69 (3-4) ◽  
pp. 309-321 ◽  
Author(s):  
Der-Duen Sheu ◽  
B.J Presley
Keyword(s):  
Gulf Of Mexico ◽  
Northern Gulf Of Mexico ◽  
Orca Basin

Multiple evidence for methylotrophic methanogenesis as the dominant methanogenic pathway in hypersaline sediments from the Orca Basin, Gulf of Mexico

2016 ◽  
Vol 187 ◽  
pp. 1-20 ◽  
Author(s):  
Guang-Chao Zhuang ◽  
Felix J. Elling ◽  
Lisa M. Nigro ◽  
Vladimir Samarkin ◽  
Samantha B. Joye ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Hypersaline Sediments ◽  
Orca Basin

scholarly journals Does a strong pycnocline impact organic-matter preservation and accumulation in an anoxic setting? The case of the Orca Basin, Gulf of Mexico

2009 ◽  
Vol 341 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Nicolas Tribovillard ◽  
Viviane Bout-Roumazeilles ◽  
Thomas Sionneau ◽  
Jean Carlos Montero Serrano ◽  
Armelle Riboulleau ◽  
...  
Keyword(s):  
Organic Matter ◽  
Gulf Of Mexico ◽  
Orca Basin
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