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On Possible Impact of The Indian Summer Monsoon on the ENSO

Goswami, BN and Jayavelu, V (2001) On Possible Impact of The Indian Summer Monsoon on the ENSO. In: Geophysical Research Letters, 28 (4). pp. 571-574.

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Abstract

The Indian summer monsoon (ISM) could influence the El Ni˜no and Southern Oscillation (ENSO) only if it could induce significant surface wind anomalies in the active regions of central and eastern equatorial Pacific. Using 50-year NCEP reanalysis, it is shown that observed surface winds in the central and eastern Pacific associated ‘purely’ with ISM and unrelated to ENSO are very weak (~ 0.5m.s1). Strong surface winds in the central and eastern Pacific following a ‘strong’ or ‘weak’ ISM, noted in some earlier composite analyses, are related not to ISM but to the concurrent sea surface temperature (SST) forcing associated with the ENSO. A long run of an atmospheric general circulation model (AGCM) without inter-annual SST forcing also show that a ‘pure’ ISM induces only very weak surface winds in the equatorial central and eastern Pacific. Thus, we conclude that the ISM by itself is unlikely to influence the ENSO in a significant way.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Geophysical Union.
Department/Centre: Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited: 08 Sep 2004
Last Modified: 19 Sep 2010 04:16
URI: http://eprints.iisc.ernet.in/id/eprint/1948

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