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Coupling between the El-Niño and planetary-scale waves and their linkage with the Indian monsoon rainfall

Bhalme, HN and Sikder, AB and Jadhav, SK (1990) Coupling between the El-Niño and planetary-scale waves and their linkage with the Indian monsoon rainfall. Meteorology and Atmospheric Physics, 44 (1-4). pp. 293-305.

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The relationships between the El-Niño phenomenon and the planetary-scale waves, and the interannual variations in the Indian monsoon (June-September) rainfall have been analysed in order to investigate how the sea surface temperature (SST) in the equatorial eastern Pacific associated with the El-Niño can produce reduced monsoon rainfall over India by teleconnections. The longitude of ridge location over the Indian region of the integrated planetary waves (numbers 1-3) along 15° N latitude circle in the height field of 200 mb pressure level in May is significantly (r=0.93, significant at 98 CL) related to the May SST anomaly at Puerto Chicama. This implies that warmer (colder) SST anomalies are associated with eastward (westward) longitude of the ridge location. The variations of the ridge location in May appear to be significantly inversely (r=-0.95, significant at 99 CL) related to the Indian monsoon rainfall, with rainfall tending to be less (more) than normal during eastward (westward) longitude of the ridge location suggesting some predictive value for the Indian monsoon rainfall. The Indian monsoon rainfall and May SST anomaly at Puerto Chicama are inversely related (r=-0.90, significant at 96 CL). In terms of the observed relationships, a plausible mechanism for linking El-Niño with the reduced Indian monsoon rainfall is discussed. The relationships noted suggest that excessive warm SST anomalies associated with El-Niño induce an eastward shift in the planetary waves which in turn reduce the Indian monsoon rainfall.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer-Verlag
Uncontrolled Keywords: coupling; El Nino; monsoon rainfall; planetary scale wave, India
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 02 May 2015 05:19
Last Modified: 02 May 2015 05:19

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