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Paleoproductivity Variations in the Equatorial Arabian Sea: Implications for East African and Indian Summer Rainfalls and the El Niño Frequency

Published online by Cambridge University Press:  18 July 2016

Manish Tiwari*
Planetary and Geosciences Division, Physical Research Laboratory, Ahmedabad, 380 009 India
Rengaswamy Ramesh
Planetary and Geosciences Division, Physical Research Laboratory, Ahmedabad, 380 009 India
Ravi Bhushan
Planetary and Geosciences Division, Physical Research Laboratory, Ahmedabad, 380 009 India
B L K Somayajulu
Planetary and Geosciences Division, Physical Research Laboratory, Ahmedabad, 380 009 India
A J Timothy Jull
NSF Arizona AMS Facility, University of Arizona, Tucson, Arizona, 85721 USA
George S Burr
NSF Arizona AMS Facility, University of Arizona, Tucson, Arizona, 85721 USA
Corresponding author. Email:
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We analyzed a sediment core from the equatorial Arabian Sea, chronologically constrained by accurate accelerator mass spectrometry (AMS) radiocarbon dates on selected planktonic foraminiferal species, for paleoproductivity variations corresponding to the variations in the Indian Ocean Equatorial Westerlies (IEW). The IEW in turn are positively correlated to the Southern Oscillation Index (SOI), which is a measure of El Niño, Southwest monsoon (SWM), and east African rainfall (EAR). The productivity data show that Indian and east African rainfalls declined from 35,000 calendar yr BP up to the last glacial maximum (LGM), with the maximum El Niño frequency during the last glacial period. From ∼14,500 to ∼2000 calendar yr BP (i.e. core top), we find strengthening SWM and EAR along with declining El Niño frequency.

Copyright © 2006 by the Arizona Board of Regents on behalf of the University of Arizona 


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