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• W2003295260 abstract "Analyses for dissolved oxygen, nitrate and total CO2 in the interstitial water have been combined with solid phase sediment analyses of carbon and nitrogen to calculate the rates of reaction and stoichiometry of decomposing organic matter in central Equatorial Pacific pelagic sediments. The diagenesis is dominated by aerobic respiration and nitrification. Organic carbon and total nitrogen decrease exponentially with depth in both red clay and carbonate ooze sediments. In addition, there is a correlation between surface organic carbon and total nitrogen with distance from the equator. Fixed NH4 is relatively constant with depth and constitutes 12 to 64% of the total nitrogen. The remainder is considered to be organic nitrogen. The CN ratio of the decomposing organic matter was obtained using three approaches. Using the correlations of organic carbon with total nitrogen or organic nitrogen the molar ratios varied from 3.4 to 18.1. The average of all stations was 12.6 using total nitrogen and 13.7 using organic nitrogen. The Redfield ratio is 6.6. Approaches using interstitial water chemistry gave lower ratios. The average value using correlations between dissolved oxygen and nitrate was 8.1. The same approach using total CO2 and nitrate gave an average of 9.1. Due to difficulties in unambiguously interpreting the solid phase data we favor the ratios obtained from the pore water analyses. The rate of organic matter decomposition can be obtained from model calculations using the dissolved oxygen and solid organic carbon data. Most gradients occur in the upper 10 to 20 cm of the sediments. Assuming that bioturbation is more important than sedimentation we have calculated first order rate constants. The average values using organic carbon and dissolved oxygen was 3.9 kyr− and 4.2 kyr− respectively using a biological mixing coefficient of 100 cm2 kyr−1. These rate constants decrease in direct proportions to the mixing coefficient." @default.
• W2003295260 created "2016-06-24" @default.
• W2003295260 creator A5025046799 @default.
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• W2003295260 date "1982-06-01" @default.
• W2003295260 modified "2023-09-25" @default.
• W2003295260 title "Aerobic respiration in pelagic marine sediments" @default.
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• W2003295260 doi "https://doi.org/10.1016/0016-7037(82)90062-x" @default.
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