Solar control of southwest monsoon on centennial timescales

M. Tiwari, R. Ramesh, B. L.K. Somayajulu, A. J.T. Jull, G. S. Burr

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1583-1588
Number of pages6
JournalCurrent Science
Volume89
Issue number9
StatePublished - Nov 10 2005

Keywords

  • Arabian Sea
  • Foraminifera
  • Monsoon
  • Solar forcing
  • Stable isotopes

ASJC Scopus subject areas

  • General

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    Tiwari, M., Ramesh, R., Somayajulu, B. L. K., Jull, A. J. T., & Burr, G. S. (2005). Solar control of southwest monsoon on centennial timescales. Current Science, 89(9), 1583-1588.