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• W1605342840 startingPage "78" @default.
• W1605342840 abstract "Mechanisms that control the preservation of organic carbon in the ocean are the key to interpreting the paleoceanographic carbon signal. This process is investigated here utilizing published data from sediment trap experiments in a model that couples organic carbon and oxygen reactions in marine sediments. The carbon content of sediments is most strongly influenced by the particulate organic carbon flux to the bottom, the bottom water oxygen content, and the organic matter degradation rate constant. The familiar correlation between sediment organic carbon content and sedimentation rate is likely a result of the direct relationship between the total particulate flux and organic carbon flux rather than a preservation effect of rapid sedimentation. The data indicate that the degradation rate “constant” for organic material oxidation in marine sediments increases with increasing particulate organic carbon flux to the bottom. The positive correlation of these parameters enhances the relative importance of the bottom water oxygen concentration to organic matter preservation. Cycles of the carbon concentration over the past 100,000 years in marine sediments may be influenced by changes in bottom oxygen concentration. Recent arguments that organic carbon burial on the continental slope is an effective sink for anthropogenic fossil fuel CO2 require 50% of the particulate algal carbon raining from the photic zone of the continental shelves to escape degradation and undergo burial. Calculations presented here suggest that the organic matter degradation rate is much too rapid for this amount to be buried and that the potential sink is overestimated by roughly a factor of 5." @default.
• W1605342840 created "2016-06-24" @default.
• W1605342840 creator A5064383248 @default.
• W1605342840 date "2013-03-18" @default.
• W1605342840 modified "2023-10-17" @default.
• W1605342840 title "Organic Carbon Preservation in Marine Sediments" @default.
• W1605342840 cites W1969099943 @default.
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• W1605342840 doi "https://doi.org/10.1029/gm032p0078" @default.
• W1605342840 hasPublicationYear "2013" @default.
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