Natural abundance of 15 N in particulate organic matter in the North Pacific Ocean

Details Natural abundance of 15 N in particulate organic matter in the North Pacific Ocean Natural abundance of 15 N in particulate organic matter in the North Pacific Ocean

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..249w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 40, Issue 2, pp.249-251

Physics

29

Scientific paper

The abundance of 15 N in particulate organic matter in the euphotic layer of the North Pacific Ocean was investigated. 15 N values ranged from -1.7 to +9.7% relative to atmospheric nitrogen. 15 N contents in plankton samples collected in the central and northwestern North Pacific were inversely correlated with concentrations of NO - 3 . The 15 N contents of Trichodesmium sp. (-1.7 to +0.5%) and associated Zooplankton ( ca . + 2%) were low, suggesting the significance of nitrogen supply via molecular nitrogen fixation which is assumed to involve little isotope fractionation. The variation of 15 N in particulate organic nitrogen in the euphotic layer of the ocean can be explained by biochemical isotope fractionation in the assimilation of nitrate and fixation of molecular nitrogen.

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