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dc.contributor.authorBanakar, V.K.
dc.contributor.authorOba, T.
dc.contributor.authorChodankar, A.R.
dc.contributor.authorKuramoto, T.
dc.contributor.authorYamamoto, M.
dc.contributor.authorMinagawa, M.
dc.date.accessioned2008-02-22T06:20:32Z
dc.date.available2008-02-22T06:20:32Z
dc.date.issued2005
dc.identifier.citationMarine geology, Vol.219; 99-108p.
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/993
dc.description.abstractSea surface salinity reconstruction for the Holocene and the Last Glacial Maximum (LGM) suggests that the LGM-Eastern Arabian Sea was more saline (by approx.5 psu) than the Holocene due to weakened freshwater flux to the region, and intensified winter monsoons. Time-series of sedimentary organic-carbon (C sub(org)), sigma alkenone and delta sup(13)C sub(org) for the last 100 kyr, together, indicate increased glacial productivity. Significantly reduced sedimentary-delta sub(15)N during the LGM indicates, however, diminished water column denitrification in spite of increased productivity. The distinct decoupling of denitrification from productivity during the LGM can be explained by vigorous ventilation of the thermocline as a result of simultaneously intensified formation of high-salinity water and deep-winter mixing in northern-Arabian Sea related to the extreme cold climate. The closely comparable time-series delta sup(15)N records across the Arabian Sea suggest basin-wide homogenisation of the isotopic signal. This probably resulted from combined monsoon-dependent surface water mixing, due to changes in the relative strength of reversing surface circulations, and intermediate water mixing, due to changes in north-south salinity gradient.
dc.language.isoen
dc.publisherElsevier
dc.rightsCopyright [2005]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice by copyright holder that the rights are voilated then the item would be withdrawn.
dc.subjectmonsoons
dc.subjectwater column
dc.subjectpalaeo studies
dc.subjectpalaeoclimate
dc.subjectcarbon isotopes
dc.subjectnitrogen isotopes
dc.subjectdenitrification
dc.subjectsurface salinity
dc.subjectholocene
dc.subjectsurface circulation
dc.subjectwater mixing
dc.subjectglacial features
dc.titleMonsoon related changes in sea surface productivity and water column denitrification in the Eastern Arabian Sea during the last glacial cycle
dc.typeJournal Article


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