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Drivers of Oxygen Consumption in the Northern Gulf of Mexico Hypoxic Waters—A Stable Carbon Isotope Perspective
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2018
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Source: Geophysical Research Letters, 45(19)
[PDF-1.62 MB]
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Journal Title:Geophysical Research Letters
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Description:We examined the stable carbon isotopic composition of remineralized organic carbon (δ13COCx) in the northern Gulf of Mexico (nGoM) using incubations (sediment and water) and a three-end-member mixing model. δ13COCx in incubating sediments was −18.1‰ ± 1.3‰, and δ13COCx in incubating near-surface and near-bottom waters varied with salinity, ranging from −30.4‰ to −16.2‰ from brackish water to full-strength Gulf water. The average δ13COCx was −18.6‰ ± 1.8‰ at salinity >23. A three-end-member mixing model based on a multiyear data set collected in previous summer hypoxia cruises (2011, 2012, 2014, 2015, and 2016) suggested that δ13COCx in near-bottom waters across the nGoM (5–50 m) was −18.1‰ ± 0.6‰. The close agreement of δ13COCx obtained from the three independent approaches, that is, incubations of water column, surface sediments, and mixing model, suggests that 13C-enriched organic matter of marine origin played the dominant role in near-bottom water and benthic oxygen consumption in the nGoM shelf in summer.
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Source:Geophysical Research Letters, 45(19)
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ISSN:0094-8276;1944-8007;
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