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• W1978348036 abstract "Abstract The remineralization rate of sedimentary organic carbon ( R org ) and the depth-integrated, diffusion-supplied O 2 consumption rate (IOC) during microbial metabolism in sediments was investigated in three deep-sea sites at 1100, 2000 and 3500 m water depth in the eastern north Atlantic during the spring and summer 1998. In-situ pore water O 2 profiles yielded an IOC of 0.45±0.07 mmol O 2 m −2 day −1 at the deepest site ( n =3) and ca. 1–1.5 mmol O 2 m −2 day −1 at the shallowest site ( n =2). The R org was independently estimated at all three sites from ex-situ pore water profiles of the isotopic composition of total dissolved inorganic carbon ( δ 13 C T ), assuming that the concentration and isotopic composition of pore water C T with depth in the sediment was controlled only by microbial oxidation of isotopically depleted sedimentary organic carbon. The R org was thus estimated to be ca. 0.5–0.6 mmol C m −2 day −1 at the shallowest site and ca. 0.3–0.4 mmol C m −2 day −1 at the two deeper sites. Stoichiometric and isotopic constraints indicated that oxic remineralization of sedimentary organic matter was the dominant metabolic pathway in the sediments at 3500 m water depth. Similarly, stoichiometric and isotopic constraints suggested that the R org estimates from the ex-situ pore water δ 13 C T profiles from 1100 and 2000 m water depth were likely to be minimum values and provided evidence for the occurrence of post-oxic remineralization processes. Post-oxic metabolism in the sediments of these sites could be linked to, or even augmented by, the non-diffusive mode of supply of organic matter mediated by infaunal organisms below the oxic sediment layer." @default.
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• W1978348036 date "2004-11-01" @default.
• W1978348036 modified "2023-09-23" @default.
• W1978348036 title "Rates of organic carbon oxidation in deep sea sediments in the eastern North Atlantic from pore water profiles of O2 and the δ13C of dissolved inorganic carbon" @default.
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• W1978348036 doi "https://doi.org/10.1016/j.margeo.2004.08.003" @default.
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