Computer Science
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..68...88l&link_type=abstract
Earth and Planetary Science Letters, Volume 68, Issue 1, p. 88-100.
Computer Science
7
Scientific paper
Relationships between denitrification rates and availability of organic matter in three types of marine environments -water column, water-sediment interface and sediments-were delineated. Correlation between supply and demand of organic matter for denitrification in the first two types of environments suggests that denitrification is mainly supported by organic matter provided as macroparticles from the euphotic zone. Decomposition of organic matter during denitrification in the water column of certain high productivity areas is at a minimum 1/4 to 1/2 as effective as the respiratory processes which use dissolved oxygen. Fifty percent or more of organic macroparticles deposited on the sea floor can be consumed by denitrification at the sediment-water interface. In hemipelagic sediments, the first-order denitrification rate constant, which appears to be sensitively dependent on organic carbon content, can be roughly expressed as kd = 0.60C2.1 where kd is rate constant in yr-1 and C is the percentage of organic carbon. The total turnover of nitrogen by denitrification is here estimated to be 42-69 Tg N yr-1, for the global oceans, which can be divided into three separate categories: 27-44 Tg N yr-1 in the oxygen-deficient water column; 3-13 Tg N yr-1 for the water-sediment interface and approximately 12 Tg N yr-1 for the sediment column.
Kaplan Isaac R.
Liu Kon-Kee
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