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First direct measurements of N 2 fixation during a Trichodesmium bloom in the eastern Arabian Sea

Gandhi, N and Singh, A and Prakash, S and Ramesh, R and Raman, M and Sheshshayee, MS and Shetye, S (2011) First direct measurements of N 2 fixation during a Trichodesmium bloom in the eastern Arabian Sea. Global Biogeochemical Cycles, 25 (4).

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Abstract

We report the first direct estimates of N 2 fixation rates measured during the spring, 2009 using the 15N 2 gas tracer technique in the eastern Arabian Sea, which is well known for significant loss of nitrogen due to intense denitrification. Carbon uptake rates are also concurrently estimated using the 13C tracer technique. The N 2 fixation rates vary from 0.1 to 34 mmol N m -2d -1 after correcting for the isotopic under-equilibrium with dissolved air in the samples. These higher N 2 fixation rates are consistent with higher chlorophyll a and low δ 15N of natural particulate organic nitrogen. Our estimates of N 2 fixation is a useful step toward reducing the uncertainty in the nitrogen budget.

Item Type: Article
Additional Information: Copyright of this article belongs to American Geophysical Union
Subjects: Oceanography > oceanography
Depositing User: INCOIS Library
Date Deposited: 08 Dec 2013 09:58
Last Modified: 08 Dec 2013 09:58
URI: http://moeseprints.incois.gov.in/id/eprint/167

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