Solar control of southwest monsoon on centennial timescales

Solar forcing is proposed to be a major governing factor for the southwest monsoon (SWM) strength during the Holocene. The southeastern Arabian Sea is significantly affected by monsoon run-off and is an ideal testing ground. We analysed stable oxygen isotopic composition (δ18O) of three species of p...

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Bibliographic Details
Published in:Current science (Bangalore) 2005-11, Vol.89 (9), p.1583-1588
Main Authors: Tiwari, M., Ramesh, R., Somayajulu, B. L. K., Jull, A. J. T., Burr, G. S.
Format: Article
Language:English
Subjects:
Climate change
Globarotalia menardii
Globigerinoides ruber
Globigerinoides sacculifer
Marine
Monsoons
Oceans
Oxygen isotopes
Periodicity
Precipitation
Radiocarbon dating
RESEARCH COMMUNICATIONS
Salinity
Seas
Sediment core samples
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Summary:Solar forcing is proposed to be a major governing factor for the southwest monsoon (SWM) strength during the Holocene. The southeastern Arabian Sea is significantly affected by monsoon run-off and is an ideal testing ground. We analysed stable oxygen isotopic composition (δ18O) of three species of planktonic foraminifera (Globigerinoides ruber, Gs. sacculifer and Globarotalia menardii) with high time-resolution (~ 50 yrs) in a sediment core raised from the region, and documented past variations in SWM precipitation. High-resolution isotopic and spectral analyses show that solar forcing indeed played a major role in governing the past variations in SWM precipitation on centennial timescales.
ISSN:0011-3891