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    Factors controlling January–April rainfall over southern India and Sri Lanka

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    Clim_Dyn_37_493a.pdf (3.076Mb)
    Date
    2011
    Author
    Vialard, J.
    Terray, P.
    Duvel, J.-P.
    Nanjundiah, R.S.
    Shenoi, S.S.C.
    Shankar, D.
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    Abstract
    The 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.
    URI
    http://drs.nio.org/drs/handle/2264/3901
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