Early deglacial (~19-17 ka) strengthening of the Northeast monsoon

Earlier studies that mostly relied on bulk 14 C dating indicated a weaker Southwest monsoon (SWM) and a stronger than present Northeast monsoon (NEM) during the Last Glacial Maximum (LGM, ~18000 14 C years or ~21000 calendar years ago). We have analyzed a sediment core from the equatorial Indian Oce...

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Bibliographic Details
Main Authors: Tiwari, Manish, Ramesh, R., Somayajulu, B. L. K., Jull, A. J. T., Burr, G. S.
Format: Article in Journal/Newspaper
Language:unknown
Published: American Geophysical Union 2005
Subjects:
QE Geology
Indian
Planktonic foraminifera
Online Access:http://repository.ias.ac.in/49761/
http://www.agu.org/pubs/crossref/2005/2005GL024070.shtml
Description
Summary:Earlier studies that mostly relied on bulk 14 C dating indicated a weaker Southwest monsoon (SWM) and a stronger than present Northeast monsoon (NEM) during the Last Glacial Maximum (LGM, ~18000 14 C years or ~21000 calendar years ago). We have analyzed a sediment core from the equatorial Indian Ocean, where planktonic foraminifera were dated by Accelerator Mass Spectrometry (AMS 14 C). δ 18 O analysis of three species of foraminifera viz. Globigerinoides ruber, Globigerinoides sacculifer, and Globorotalia menardii reveals that the NEM strengthened during the early deglacial period (~15000 14 C years ago or ~18000 calendar years ago) relative to the present and not during the LGM as surmised earlier.

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