Glacial-interglacial changes in the surface water characteristics of the Andaman Sea: Evidence from stable isotopic ratios of planktonic foraminifera |
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| Authors: | S M Ahmad D J Patil P S Rao B N Nath B R Rao G Rajagopalan |
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| Institution: | (1) National Geophysical Research Institute, Uppal Road, 500 007 Hyderabad, India;(2) National Institute of Oceanography, Dona Paula, 403 004 Goa, India;(3) Birbal Sahni Institute of Palaeobotany, 226 007 Lucknow, India |
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| Abstract: | Stable carbon and oxygen isotopic analyses of the planktonic foraminifera (Globigerinoides ruber) from a deep sea sediment core (GC-1) in the Andaman Sea show high glacial-to-Holocene δ18O amplitude of 2.1%o which is consistent with previously published records from this marginal basin and suggest increased
salinity and/or decreased temperature in the glacial surface waters of this region. A pulse of18O enrichment during the last deglaciation can be attributed to a Younger Dryas cooling event and/or to a sudden decrease of
fresh water influx from the Irrawady and Salween rivers into the Andaman Sea. High δ13C values observed during the isotopic stages 2 and 4 are probably due to the enhanced productivity during glacial times in
the Andaman Sea. |
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| Keywords: | Stable isotopes Younger Dryas deglaciation holocene last glacial maximum (LGM) |
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