Impact of the Indian Ocean dipole on the relationship between the Indian monsoon rainfall and ENSO

Karumuri Ashok, Zhaoyong Guan, Toshio Yamagata

Research output: Contribution to journalArticlepeer-review

856 Scopus citations

Abstract

The influence of the recently discovered Indian Ocean Dipole (IOD) on the interannual variability of the Indian summer monsoon rainfall (ISMR) has been investigated for the period 1958-1997. The IOD and the El Nino/Southern Oscillation (ENSO) have complementarily affected the ISMR during the last four decades. Whenever the ENSO-ISMR correlation is low (high), the IOD-ISMR correlation is high (low). The IOD plays an important role as a modulator of the Indian monsoon rainfall, and influences the correlation between the ISMR and ENSO. We have discovered that the ENSO-induced anomalous circulation over the Indian region is either countered or supported by the IOD-induced anomalous meridional circulation cell, depending upon the phase and amplitude of the two major tropical phenomena in the Indo-Pacific sector.
Original languageEnglish (US)
Pages (from-to)4499-4502
Number of pages4
JournalGeophysical Research Letters
Volume28
Issue number23
DOIs
StatePublished - Dec 1 2001
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • General Earth and Planetary Sciences

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