Some observations on the stable carbon isotope composition of dissolved and particulate organic carbon in the marine environment |
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| Authors: | BJ Eadie LM Jeffrey WM Sackett |
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| Institution: | Department of Oceanography, Texas A & M University, College Station, TX 77843, U.S.A. |
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| Abstract: | δ13CPDB compositions for 39 samples of dissolved organic carbon (DOC) from the Gulf of Mexico-Caribbean Sea-Atlantic Ocean system, the South Pacific and Ross Sea are reported. Deep water values are similar with a mean of ?21.8%. attesting to the homogeneity of the oceanic DOC pool. In Antarctic waters, a 5%. difference between DOC and particulate organic carbon (POC), with POC having values similar to modern plankton (δ13CPDB approx ?27%.) supports the idea of the transient nature of POC as compared to DOC.Total, lipid, acid hydrolyzed, amino acid and residue fractions of POC are about 5, 3, 7, 5 and 3%. respectively, more negative in 2000 m water as compared to surface water samples from the Gulf of Mexico. |
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