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Contribution of atmospheric nitrogen deposition to new production in the nitrogen limited photic zone of the northern Indian Ocean

Singh, A and Gandhi, N and Ramesh, R (2012) Contribution of atmospheric nitrogen deposition to new production in the nitrogen limited photic zone of the northern Indian Ocean. Journal of Geophysical Research C: Oceans, 117 (6).

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Abstract

Primary productivity in the sunlit surface layers of tropical oceans is mostly limited by the supply of reactive nitrogen (Nr) through upwelling, N2 fixation by diazotrophs, riverine flux and atmospheric deposition. The relative importance of these processes varies from region to region. Using recent data on the nitrogen content of aerosols over the ocean and marine new production in parts of the northern Indian Ocean for the period 1994–2006 CE, a quantitative assessment of the contribution of atmospheric deposition to new production in the two biogeochemically different basins of the northern Indian Ocean, viz., the Arabian Sea and the Bay of Bengal, is presented. By suitably converting the measured concentrations of aerosol nitrogen into fluxes and comparing them with 15N tracer-based direct new and primary production measurements, it is inferred that the contribution of atmospheric deposition to new production in the northern Indian Ocean could at best be ∼3%. Our estimate of ∼1.39 Tg N year−1 of Nr flux int

Item Type: Article
Additional Information: Copyright of this article belongs to American Geophysical Union.
Uncontrolled Keywords: Arabian sea; Atmospheric depositions; Atmospheric nitrogen deposition; Bay of Bengal; Indian ocean; New production; Nitrogen budgets; Nitrogen content; Photic zone; Primary production; Primary productivity; Quantitative assessments; Reactive nitrogen; Riverine flux; Sunlit surface layers; Tropical ocean, Atmospheric aerosols; Atmospheric chemistry; Atmospherics; Meteorological problems; Nitrogen; Oceanography; Uncertainty analysis, Nitrogen fixation, aerosol; atmospheric deposition; data set; nitrogen cycle; nitrogen fixation; photic zone; primary production; quantitative analysis, Arabian Sea; Bay of Bengal; Indian Ocean
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 27 Dec 2013 20:44
Last Modified: 27 Dec 2013 20:44
URI: http://moeseprints.incois.gov.in/id/eprint/482

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