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.
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|
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