Glacial-interglacial changes in the surface water characteristics of the Andaman Sea: Evidence from stable isotopic ratios of planktonic foraminifera | Zendy

Syed Masood Ahmad | Zendy; D. J. Patil | Zendy; P. S. Rao | Zendy; B. Nagender Nath | Zendy; B. R. Rao | Zendy; G. Rajagopalan | Zendy

Open Access

Glacial-interglacial changes in the surface water characteristics of the Andaman Sea: Evidence from stable isotopic ratios of planktonic foraminifera

Author(s) -

Syed Masood Ahmad,

D. J. Patil,

P. S. Rao,

B. Nagender Nath,

B. R. Rao,

G. Rajagopalan

Publication year - 2000

Publication title -

journal of earth system science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.444

H-Index - 52

eISSN - 0973-774X

pISSN - 0253-4126

DOI - 10.1007/bf02719159

Subject(s) - globigerinoides , glacial period , foraminifera , geology , younger dryas , deglaciation , oceanography , δ18o , salinity , interglacial , plankton , last glacial maximum , holocene , paleontology , stable isotope ratio , benthic zone , physics , quantum mechanics

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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