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    Benthic cycling of phosphorus in the Eastern Arabian Sea: Evidence of present day phosphogenesis

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    Mar_Chem_199_53a.pdf (3.366Mb)
    Date
    2018
    Author
    Linsy, P.
    Nath, B.N.
    Mascarenhas-Pereira, M.B.L.
    Vinitha, P.V.
    Ray, D.
    PrakashBabu, C.
    Rao, B.R.
    Kazip, A.
    Sebastian, T.
    Kocherla, M.
    Miriyala, P.
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    Abstract
    Results of a study on phosphorus (P) cycling in the Eastern Arabian Sea provides convincing evidence of present-day phosphogenesis in the study area. This finding contrasts with previous reports of the occurrence of only old phosphorites along the Indian margin. Extensive benthic P regeneration is observed in the sediments that are deposited on topographic highs in the western Indian continental margin, which is impinged by a perennial oxygen minimum zone (OMZ). The phosphate flux from the sediments ranged between 1.1 and 22mmolm?2yr?1. Among the P reservoirs, biogenic P (Pbio) is the major pool of P within the upper 30cm of sediment. P released from organic matter decomposition and fish debris dissolution mainly controls benthic P regeneration while the role of redox cycling of iron is weak. The change in authigenic P (Pauth) with depth in the sediment and concomitant decrease in porewater dissolved inorganic phosphate (DIP), solid phase Pbio and organic P (Porg) content collectively indicate the transformation of P from labile phases to an authigenic phase. Molar Corg/Porg and Corg/Preactive ratios also support the notion of ongoing phosphogenesis in the area. The content of carbonate fluroapatite (CFA) is elevated especially in one of the three study sites as a result of in-situ precipitation and a contribution from eolian and water column authigenesis. The estimated burial efficiency of P at the sediment-water interface at two locations is only about 2%, which is much less than in the western Arabian Sea also indicating extensive P regeneration.
    URI
    https://doi.org/10.1016/J.MARCHEM.2018.01.007
    http://drs.nio.org/drs/handle/2264/7715
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