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Nitrous oxide emissions from the Arabian Sea: A synthesis

Lookup NU author(s): Dr Hermann Bange, Christopher Law, Professor Robert Upstill-Goddard

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Abstract

We computed high-resolution (1degrees latitude x 1degrees longitude) seasonal and annual nitrous oxide (N2O) concentration fields for the Arabian Sea surface layer using a database containing more than 2400 values measured between December 1977 and July 1997. N2O concentrations are highest during the southwest (SW) monsoon along the southern Indian continental shelf. Annual emissions range from 0.33 to 0.70 Tg N2O and are dominated by fluxes from coastal regions during the SW and northeast monsoons. Our revised estimate for the annual N2O flux from the Arabian Sea is much more tightly constrained than the previous consensus derived using averaged in-situ data from a smaller number of studies. However, the tendency to focus on measurements in locally restricted features in combination with insufficient seasonal data coverage leads to considerable uncertainties of the concentration fields and thus in the flux estimates, especially in the coastal zones of the northern and eastern Arabian Sea. The overall mean relative error of the annual N2O emissions from the Arabian Sea was estimated to be at least 65%.


Publication metadata

Author(s): Upstill-Goddard RC; Law CS; Bange HW; Andreae MO; Lal S; Naqvi SWA; Patra PK; Rixen T

Publication type: Article

Publication status: Published

Journal: Atmospheric Chemistry and Physics

Year: 2001

Volume: 1

Issue: 1

Pages: 61-71

ISSN (print): 1680-7316

ISSN (electronic): 1680-7324

Publisher: Copernicus GmbH

URL: http://dx.doi.org/10.5194/acp-1-61-2001

DOI: 10.5194/acp-1-61-2001


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