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dc.contributor.authorNaqvi, S. W. A.  Concept link
dc.contributor.authorMoffett, James W.  Concept link
dc.contributor.authorGauns, M. U.  Concept link
dc.contributor.authorNarvekar, P. V.  Concept link
dc.contributor.authorPratihary, A. K.  Concept link
dc.contributor.authorNaik, H.  Concept link
dc.contributor.authorShenoy, D. M.  Concept link
dc.contributor.authorJayakumar, D. A.  Concept link
dc.contributor.authorGoepfert, Tyler J.  Concept link
dc.contributor.authorPatra, Prabir K.  Concept link
dc.contributor.authorAl-Azri, Adnan  Concept link
dc.contributor.authorAhmed, S. I.  Concept link
dc.identifier.citationBiogeosciences 7 (2010): 2091-2100en_US
dc.description© The Authors, 2010. This article is distributed under the terms of the Creative Commons Attribution 3.0 License. The definitive version was published in Biogeosciences 7 (2010): 2091-2100, doi:10.5194/bg-7-2091-2010.en_US
dc.description.abstractExtensive observations were made during the late Southwest Monsoon of 2004 over the Indian and Omani shelves, and along a transect that extended from the southern coast of Oman to the central west coast of India, tracking the southern leg of the US JGOFS expedition (1994–1995) in the west. The data are used, in conjunction with satellite-derived data, to investigate long-term trends in chlorophyll and sea surface temperature, indicators of upwelling intensity, and to understand factors that control primary production (PP) in the Arabian Sea, focussing on the role of iron. Our results do not support an intensification of upwelling in the western Arabian Sea, reported to have been caused by the decline in the winter/spring Eurasian snow cover since 1997. We also noticed, for the first time, an unexpected development of high-nutrient, low-chlorophyll condition off the southern Omani coast. This feature, coupled with other characteristics of the system, such as a narrow shelf and relatively low iron concentrations in surface waters, suggest a close similarity between the Omani upwelling system and the Peruvian and California upwelling systems, where PP is limited by iron. Iron limitation of PP may complicate simple relationship between upwelling and PP assumed by previous workers, and contribute to the anomalous offshore occurrence of the most severe oxygen (O2) depletion in the region. Over the much wider Indian shelf, which experiences large-scale bottom water O2-depletion in summer, adequate iron supply from reducing bottom-waters and sediments seems to support moderately high PP; however, such production is restricted to the thin, oxygenated surface layer, probably because of the unsuitability of the O2-depleted environment for the growth of oxygenic photosynthesizers.en_US
dc.description.sponsorshipFinancial support was provided by CSIR through the Network Project CMM0009 to SWAN and by NSF through OCE-0327227S to JWM.en_US
dc.publisherCopernicus Publications on behalf of the European Geosciences Unionen_US
dc.rightsAttribution 3.0 Unported*
dc.titleThe Arabian Sea as a high-nutrient, low-chlorophyll region during the late Southwest Monsoonen_US

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Attribution 3.0 Unported
Except where otherwise noted, this item's license is described as Attribution 3.0 Unported