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

หน่วยงาน National Institute Of Oceanography (NIO), India

รายละเอียด

ชื่อเรื่อง : Factors controlling January–April rainfall over southern India and Sri Lanka
นักวิจัย : Vialard, J. , Terray, P. , Duvel, J.-P. , Nanjundiah, R.S. , Shenoi, S.S.C. , Shankar, D.
คำค้น : rainfall , El Nino phenomena , southern oscillation , Interannual variability
หน่วยงาน : National Institute Of Oceanography (NIO), India
ผู้ร่วมงาน : -
ปีพิมพ์ : 2554
อ้างอิง : Climate Dynamics, vol.37; 2011; 493-507 , http://drs.nio.org/drs/handle/2264/3901
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : -
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

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.

บรรณานุกรม :
Vialard, J. , Terray, P. , Duvel, J.-P. , Nanjundiah, R.S. , Shenoi, S.S.C. , Shankar, D. . (2554). Factors controlling January–April rainfall over southern India and Sri Lanka.
    : National Institute Of Oceanography (NIO), India.
Vialard, J. , Terray, P. , Duvel, J.-P. , Nanjundiah, R.S. , Shenoi, S.S.C. , Shankar, D. . 2554. "Factors controlling January–April rainfall over southern India and Sri Lanka".
    : National Institute Of Oceanography (NIO), India.
Vialard, J. , Terray, P. , Duvel, J.-P. , Nanjundiah, R.S. , Shenoi, S.S.C. , Shankar, D. . "Factors controlling January–April rainfall over southern India and Sri Lanka."
    : National Institute Of Oceanography (NIO), India, 2554. Print.
Vialard, J. , Terray, P. , Duvel, J.-P. , Nanjundiah, R.S. , Shenoi, S.S.C. , Shankar, D. . Factors controlling January–April rainfall over southern India and Sri Lanka. : National Institute Of Oceanography (NIO), India; 2554.