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Planktonic Foraminiferal and Alkenone Records of the Last Deglaciation from the Eastern Arabian Sea

Published online by Cambridge University Press:  20 January 2017

Olivia Cayre  and
Edouard Bard
Olivia Cayre
Affiliation:
CEREGE, Université Aix-Marseille III et CNRS-UMR-6635, Europôle de l'Arbois, B.P. 80, 13545, Aix en Provence, Cedex 4, France. E-mail: ocayre@cerege.fr, bard@cerege.fr
Edouard Bard
Affiliation:
CEREGE, Université Aix-Marseille III et CNRS-UMR-6635, Europôle de l'Arbois, B.P. 80, 13545, Aix en Provence, Cedex 4, France. E-mail: ocayre@cerege.fr, bard@cerege.fr
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Abstract

The oxygen isotope record of planktonic foraminifera from tropical core MD77194 (Eastern Arabian Sea) exhibits a clear two-step deglaciation with a brief δ18O transient event. In the tropics, this δ18O maximum could correspond to a cooling or to a change in the δ18O content of sea water. In this study, past sea-surface temperature (SST) and primary production (PP) are reconstructed from foraminiferal transfer functions and compared to values estimated from alkenone measurements. SST and PP records from both proxies indicate a 1.5–2.5°C deglacial warming, coupled with a PP decrease, and a 0.5–1°C cooling during the Younger Dryas (YD). A detailed comparison between independent micropaleontological and geochemical proxies helps us identify potential biases and thus strengthen the paleo-reconstructions.

Keywords

planktonic foraminiferaalkenoneslast deglaciationArabian Sea
Type
Research Article
Information
Quaternary Research , Volume 52 , Issue 3 , November 1999 , pp. 337 - 342
Copyright
University of Washington

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