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    Intra-annual variability of carbon and nitrogen stable isotopes in suspended organic matter in waters of the western continental shelf of India

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    Biogeosciences_8_3441.pdf (872.0Kb)
    Date
    2011
    Author
    Maya, M.V.
    Karapurkar, S.G.
    Naik, H.
    Roy, R.
    Shenoy, D.M.
    Naqvi, S.W.A.
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    Abstract
    Intra-annual variations of delta sup(13)C and delta sup(15)N of watercolumn suspended particulate organic matter (SPOM) have been investigated to understand the biogeochemical cycling of C and N in the Western Continental Shelf of India (WCSI). The key issues being addressed are: how the delta sup(15)N of SPOM is affected by seasonally varying processes of organic matter production and respiration and how it relates to the delta sup(15)N of sedimentary organic matter that appears to show a decreasing trend despite an apparent intensification of seasonal oxygen deficiency over the past few decades? A secondary objective was to evaluate the sources of organic carbon. Elemental carbon and nitrogen concentrations, C/N ratios in SPOM, along with ancillary chemical and biological variables including phytoplankton pigment abundance were also determined on a seasonal basis (from March 2007 to September 2008), with the partial exception of the southwest (SW) monsoon period.
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    http://drs.nio.org/drs/handle/2264/3969
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