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dc.contributor.authorVialard, J.
dc.contributor.authorTerray, P.
dc.contributor.authorDuvel, J.-P.
dc.contributor.authorNanjundiah, R.S.
dc.contributor.authorShenoi, S.S.C.
dc.contributor.authorShankar, D.
dc.date.accessioned2011-08-23T09:36:04Z
dc.date.available2011-08-23T09:36:04Z
dc.date.issued2011
dc.identifier.citationClimate Dynamics, vol.37; 2011; 493-507
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/3901
dc.description.abstractThe factors controlling rainfall over southern India and Sri Lanka between January and April, i.e. outside of the southwest and northeast monsoons are explored. This period accounts for 20% of annual precipitation over Sri Lanka and 10% over the southern Indian states of Kerala and Tamil Nadu. Interannual variability is strong (about 40% of the January– April climatology). Intraseasonal rainfall anomalies over southern India and Sri Lanka are significantly associated with equatorial eastward propagation, characteristic of the Madden Julian Oscillation. At the interannual timescale, a clear connection is noticed with El Nino-Southern Oscillation (ENSO); with El Ninos being associated with decreased rainfall (correlation of -0.46 significant at the 98% level). There is also a significant link with local SST anomalies over the Indian Ocean and in particular with the inter-hemispheric sea surface temperature (SST) gradient over the Indian Ocean (with colder SST south of the equator being conducive to more rainfall, correlation of 0.55 significant at the 99% level). La Ninas/cold SSTs south of the equator tend to have a larger impact than El Ninos.
dc.language.isoen
dc.publisherSpringer
dc.rightsAn edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2011] Springer.
dc.subjectrainfall
dc.subjectEl Nino phenomena
dc.subjectsouthern oscillation
dc.subjectInterannual variability
dc.titleFactors controlling January–April rainfall over southern India and Sri Lanka
dc.typeJournal Article


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