scholarly journals Deep Sediment-Sourced Methane Contribution to Shallow Sediment Organic Carbon: Atwater Valley, Texas-Louisiana Shelf, Gulf of Mexico

Energies ◽  
2015 ◽  
Vol 8 (3) ◽  
pp. 1561-1583 ◽  
Author(s):  
Richard Coffin ◽  
Christopher Osburn ◽  
Rebecca Plummer ◽  
Joseph Smith ◽  
Paula Rose ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Gulf Of Mexico ◽  
Deep Sediment ◽  
Louisiana Shelf ◽  
Sediment Organic Carbon

scholarly journals Macrofaunal diversity and community structure of the DeSoto Canyon and adjacent slope

2021 ◽  
Vol 664 ◽  
pp. 23-42
Author(s):  
AK Shantharam ◽  
CL Wei ◽  
M Silva ◽  
AR Baco
Keyword(s):  
Community Structure ◽  
Organic Carbon ◽  
Gulf Of Mexico ◽  
Oxygen Concentration ◽  
Group Iii ◽  
Environmental Models ◽  
Sediment Deposits ◽  
Group I ◽  
Sediment Organic Carbon ◽  
Canyon Wall

Northern Gulf of Mexico canyons are centers of organic matter accumulation and biodiversity, but studies of their finer-scale (sub-100 km) ecological patterns are scarce. Detailed sampling of macrofauna within the DeSoto Canyon was undertaken along 3 depth transects on the canyon wall, axis, and adjacent slope. Sediment, terrain, and water mass parameters were also compiled for the same stations. Within the canyon, macrofaunal abundance decreased, evenness increased, and richness followed the expected parabolic curve with depth, peaking at 1100 m. Cluster analysis identified 3 canyon depth groups that conformed to established bathymetric boundaries for the non-canyon Gulf of Mexico slope: Group I at <500 m, Group II at 669-1834 m, and Group III at >2000 m. Explanatory environmental models indicate that canyon community structure was strongly correlated with oxygen concentration and fluorescence, with a weaker potential influence from any of salinity, particulate organic carbon, sediment organic carbon, or slope. Comparisons of the habitats indicated that abundances were highest on the canyon wall. Slope community structure differed from that of either of the canyon habitats. Environmental models consisted of single variables including oxygen concentration, sediment organic carbon, slope, and temperature with similar explanatory values. Community differences within the canyon and between the canyon and adjoining slope contradict previous findings of a single faunal zone for the whole study area. Factors that may contribute to inter-habitat heterogeneity include potential hydrocarbon seepage, organically enriched sediment deposits along channels, or remnant influence from the Deepwater Horizon spill, warranting more research into this dynamic ecosystem.

Effects of marine pollution, climate, and tidal range on biomass and sediment organic carbon in Chinese mangrove forests

CATENA ◽  
2021 ◽  
Vol 202 ◽  
pp. 105270
Author(s):  
Gang Wang ◽  
Minerva Singh ◽  
Jiaqiu Wang ◽  
Ling Xiao ◽  
Dongsheng Guan
Keyword(s):  
Organic Carbon ◽  
Marine Pollution ◽  
Tidal Range ◽  
Mangrove Forests ◽  
Sediment Organic Carbon

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.

scholarly journals Blooms of cyanobacteria in a temperate Australian lagoon system post and prior to European settlement

2016 ◽  
Vol 13 (12) ◽  
pp. 3677-3686 ◽  
Author(s):  
Perran L. M. Cook ◽  
Miles Jennings ◽  
Daryl P. Holland ◽  
John Beardall ◽  
Christy Briles ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Content ◽  
Phosphorus Release ◽  
Cyanobacterial Blooms ◽  
Organic Carbon Content ◽  
Lagoon System ◽  
European Settlement ◽  
Current Period ◽  
Sediment Organic Carbon ◽  
Nitrogen Inputs

Abstract. Blooms of noxious N2 fixing cyanobacteria such as Nodularia spumigena are a recurring problem in some estuaries; however, the historic occurrence of such blooms in unclear in many cases. Here we report the results of a palaeoecological study on a temperate Australian lagoon system (the Gippsland Lakes) where we used stable isotopes and pigment biomarkers in dated cores as proxies for eutrophication and blooms of cyanobacteria. Pigment proxies show a clear signal, with an increase in cyanobacterial pigments (echinenone, canthaxanthin and zeaxanthin) in the period coinciding with recent blooms. Another excursion in these proxies was observed prior to the opening of an artificial entrance to the lakes in 1889, which markedly increased the salinity of the Gippsland Lakes. A coincident increase in the sediment organic-carbon content in the period prior to the opening of the artificial entrance suggests that the bottom waters of the lakes were more stratified and hypoxic, which would have led to an increase in the recycling of phosphorus. After the opening of the artificial entrance, there was a  ∼  60-year period with low values for the cyanobacterial proxies as well as a low sediment organic-carbon content suggesting a period of low bloom activity associated with the increased salinity of the lakes. During the 1940s, the current period of re-eutrophication commenced, as indicated by a steadily increasing sediment organic-carbon content and cyanobacterial pigments. We suggest that increasing nitrogen inputs from the catchment led to the return of hypoxia and increased phosphorus release from the sediment, which drove the re-emergence of cyanobacterial blooms.

scholarly journals Spatial Variation in Sediment Organic Carbon Distribution across the Alaskan Beaufort Sea Shelf

Energies ◽  
2017 ◽  
Vol 10 (9) ◽  
pp. 1265 ◽  
Author(s):  
Richard Coffin ◽  
Joseph Smith ◽  
Brandon Yoza ◽  
Thomas Boyd ◽  
Michael Montgomery
Keyword(s):  
Organic Carbon ◽  
Spatial Variation ◽  
Beaufort Sea ◽  
Carbon Distribution ◽  
Sediment Organic Carbon

Effects of sediment organic carbon on distribution of radiolabeled fluoranthene and PCBs among sediment, interstitial water, and biota

1993 ◽  
Vol 51 (6) ◽  
pp. 873-880 ◽  
Author(s):  
J. M. Brannon ◽  
C. B. Price ◽  
F. J. Reilly ◽  
J. C. Pennington ◽  
V. A. McFarland
Keyword(s):  
Organic Carbon ◽  
Interstitial Water ◽  
Sediment Organic Carbon

scholarly journals Effects of temperature, salinity, and sediment organic carbon on methylmercury bioaccumulation in an estuarine amphipod

2019 ◽  
Vol 687 ◽  
pp. 907-916 ◽  
Author(s):  
Amanda N. Curtis ◽  
Kimberly Bourne ◽  
Mark E. Borsuk ◽  
Kate L. Buckman ◽  
Eugene Demidenko ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Sediment Organic Carbon ◽  
Effects Of Temperature ◽  
Methylmercury Bioaccumulation

Increasing salinization and organic carbon burial rates in seagrass meadows from an anthropogenically-modified coastal lagoon in southern Gulf of Mexico

2020 ◽  
Vol 242 ◽  
pp. 106843 ◽  
Author(s):  
Ana Carolina Ruiz-Fernández ◽  
Joan-Albert Sanchez-Cabeza ◽  
Tomasa Cuéllar-Martínez ◽  
Libia Hascibe Pérez-Bernal ◽  
Vladislav Carnero-Bravo ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Gulf Of Mexico ◽  
Coastal Lagoon ◽  
Seagrass Meadows ◽  
Carbon Burial ◽  
Organic Carbon Burial ◽  
Southern Gulf Of Mexico ◽  
Burial Rates
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