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    River inputs and organic matter fluxes in the northern Bay of Bengal: Fatty acids

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    Chem_Geol_103_55.pdf (1.432Mb)
    Date
    1993
    Author
    Reemtsma, T.
    Ittekkot, V.
    Bartsch, M.
    Nair, R.R.
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    Abstract
    Total particulate matter flux and organic carbon and fatty acid fluxes associated with settling particles collected during the summer-monsoon period of 1988 using time-series sediment traps deployed at two depths (809 and 1750 m) in the northern Bay of Bengal are presented. Total matter varies between 100 and 375 mg m super(-2) day super(-1), and organic carbon flux between 10 and 20 mg m super(-2) day super(-1). Maximum in these fluxes occur in July and appear to be related to freshwater inputs from the rivers Ganges and Brahmaputra. Temporal variations in fatty acid contents and fluxes differ from this trend with the highest occurring in August (1.6%, 2 mg m super(-2) day super(-1)). The fluxes of all the three measured parameters are exceptionally high and indicate elevated autochthonous production associated with the supply of nutrients and particles by the rivers. A principal-component multiple regression procedure applied to the time-series fatty acid data allows to distinguish between and to quantitatively assess fatty acid inputs from terrigenous sources, and marine phytoplankton, zooplankton and bacteria. While the flux of terrigenous fatty acids exhibits two peaks, related to the first rise in riverine discharge due to meltwater runoff in June and to receding water in August, the marine fatty acid flux shows three peaks. The ratio of marine to terrigenous fatty acid flux reflects two maxima in primary production, which could result from the passage of a river plume over the sampling location: its advance with rising river water discharge in July, and retreat with receding river discharge in August
    URI
    http://drs.nio.org/drs/handle/2264/2878
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