Long-chain alkaenone unsaturation index as sea surface temperature proxy in southwest Bay of Bengal

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dc.contributor.author Sarma, N.S.
dc.contributor.author Pasha, S.K.G.
dc.contributor.author SriRamKrishna, M.
dc.contributor.author Shirodkar, P.V.
dc.contributor.author Yadava, M.G.
dc.contributor.author Rao, K.M.
dc.date.accessioned 2006-09-02T10:48:03Z
dc.date.available 2006-09-02T10:48:03Z
dc.date.issued 2006
dc.identifier.citation Current Science. vol.91(1), 82-86p.
dc.identifier.uri http://drs.nio.org/drs/handle/2264/343
dc.description.abstract As a proxy of the sea surface temperature (SST), C sub(37) long-chain alkenones (LCAs) preserved in sediments of the southwestern Bay of Bengal and dating back to the last glacial period, were identified in SIM GC-EI MS spectra run at m/z 530.55 (dienone: C sbu(37:2) LCA) and 528.52 (trienone: C sub(37:3) LCA). The yields of LCAs (C sub(37:2) + C sub(37:3)) relative to extractable lipid of the sediment are higher in the glacial than the Holocene sediments by a factor of three. The LCA unsaturation index and the SST calculated from calibration equations showed coherence with delta sup(18)O of the planktonic foraminifer, Globigerinoides ruber. It is inferred that with reference to the Holocene, the last glacial surface sea water was approx. 2.75 degrees C cooler from the alkenone data and was approx. 2‰ more saline from a combination of LCA and d18O data.
dc.format.extent 112640 bytes
dc.format.mimetype application/pdf
dc.language.iso en
dc.publisher Indian Academy of Sciences
dc.subject Bay of Bengal
dc.subject Holocene sediments
dc.title Long-chain alkaenone unsaturation index as sea surface temperature proxy in southwest Bay of Bengal
dc.type Journal Article


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