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dc.contributor.authorSankar, S.
dc.contributor.authorRameshKumar, M.R.
dc.contributor.authorReason, C.
dc.date.accessioned2011-03-09T10:54:58Z
dc.date.available2011-03-09T10:54:58Z
dc.date.issued2011
dc.identifier.citationTheoretical and Applied Climatology, vol.103(3-4); 2011; 359-374
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/3803
dc.description.abstractInterannual variations of the monsoon onset over Kerala (MOK) have been studied using data from over 60 years (1948-2009) of NCEP/NCAR reanalysis and outgoing long-wave radiation. The sea surface temperature fields over the North Indian Ocean associated with the MOK have been examined in association with El Nino and Indian Ocean Dipole (IOD) events which originate in the Pacific and Indian Ocean, respectively. An analysis of the tropical convective maximum showed significant differences in its strength and location during the El Nino, IOD, early, normal, and delayed MOK composites. Further, we also looked into the role of the convective systems formed over the Arabian Sea and Bay of Bengal on MOK. The most significant features during early (delayed) MOK years is the abnormal persistence of westerlies (easterlies) several days prior to MOK and enhanced (suppressed) deep convection over the southeastern Arabian Sea and the southern Bay of Bengal. Moisture builds up over peninsular India several pentads prior to MOK during La Nina, negative IOD, and concurrent La Nina and negative IOD years as compared to the El Nino, positive IOD, and concurrent El Nino and positive IOD years, indicating its significant role on MOK. The monsoon Hadley cell and Walker circulations are weaker (stronger) during a delayed (early) MOK. Further, the sea surface temperature anomalies in the western Pacific are negative (positive) during delayed (early) MOK
dc.language.isoen
dc.publisherSpringer
dc.rightsAn edited version of this paper was published by Springer. This paper is for R & D pupose and Copyright [2011] Springer
dc.subjectEl Nino
dc.subjectIndian Ocean
dc.subjectmonsoon
dc.subjectsurface temperature
dc.titleOn the relative roles of El Nino and Indian Ocean Dipole events on the monsoon onset over Kerala
dc.typeJournal Article


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