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On the recent strengthening of the relationship between ENSO and northeast monsoon rainfall over South Asia

Kumar, P and Rupa Kumar, K and Rajeevan, M and Sahai, AK (2007) On the recent strengthening of the relationship between ENSO and northeast monsoon rainfall over South Asia. Climate Dynamics, 28 (6). pp. 649-660.

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Abstract

The southeastern parts of India and Sri Lanka receive substantial rainfall from the northeast monsoon (NEM) during October through December. The interannual variability in NEM rainfall is known to be significantly influenced by the El-Niño/Southern Oscillation (ENSO). Unlike the southwest monsoon (SWM), the NEM rainfall is enhanced during the warm ENSO events, and vice versa. In the context of the recent weakening of the inverse relationship between Southwest Monsoon (SWM) and ENSO, we examine the secular variations in the positive relationship between ENSO and NEM rainfall over South Asia, showing that their relationship has strengthened over the recent years. Based on the analysis of GISST, IMD/CRU precipitation and NCEP/NCAR reanalysis data, we suggest that this secular variation of the relationship is due to epochal changes in the tropospheric circulation associated with ENSO over the region.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer.
Uncontrolled Keywords: annual variation; El Nino-Southern Oscillation; monsoon; rainfall; regional climate; secular variation, Asia; Eurasia; India; South Asia; Sri Lanka
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 31 Dec 2014 09:49
Last Modified: 31 Dec 2014 09:49
URI: http://moeseprints.incois.gov.in/id/eprint/1899

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