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    Role of iron deficiency in production and remineralization of organic matter in the Arabian Sea

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    Solas_News_11_10.pdf (200.9Kb)
    Date
    2007
    Author
    Naqvi, S.W.A.
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    Abstract
    The Arabian Sea contains the only major western-boundary upwelling system in the world's oceans During summer, strong southwesterly winds bring up subsurface waters from depths of up to 200m off Somalia, Yemen and Oman These waters, having high concentrations of macronutrients, especially nitrate and phosphate are rapidly transported by filaments and plumes over 1,000 km offshore Export of particulate organic matter (POM) produced by the resultant phytoplankton blooms and its remineralization below the mixed layer sustains the thickest (100/150-1200m) oxygen minimum zone (OMZ) in the ocean Within a well-demarcated portion of the OMZ the dissolved oxygen concentration is very close to zero, allowing largescale microbial conversion of nitrate to N2 through denitrification and anaerobic ammonium oxidation This zone is distinguished by very low levels of nitrous oxide (N2O), whereas intense accumulation of N2O occurs at its boundaries, making the Arabian Sea a globally significant source of this potent greenhouse gas Surprisingly, unlike the OMZs of the Atlantic and the Pacific, the suboxic zone of the Arabian Sea is geographically separated from the high-productivity upwelling centres
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    http://drs.nio.org/drs/handle/2264/7584
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