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Emerging role of Indian ocean on Indian northeast monsoon

Yadav, RK (2013) Emerging role of Indian ocean on Indian northeast monsoon. Climate Dynamics, 41 (1). pp. 105-116.

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Abstract

This study examines the emerging role of Indian Ocean sea surface temperature (SST) on the inter-annual variability (IAV) of Indian north-east monsoon rainfall (NEMR). The IAV of NEMR is associated with the warm SST anomaly over east Bay-of-Bengal (BoB) (88.5oE-98.5oE; 8.5oN-15.5oN) and cool SST anomaly over east equatorial Indian Ocean (80.5oE-103.5oE; 6.5oS-3.5oN). The gradient of SST between these boxes (i.e. northern box minus southern box) shows strong and robust association with the Indian NEMR variability in the recent decades. For establishing the teleconnections, SST, mean sea level pressure, North Indian Ocean tropical storm track, and circulation data have been used. The study reveals that during the positive SST gradient years, the inter-tropical convergence zone (ITCZ) shifts northwards over the East Indian Ocean. The tropical depressions, storms and cyclones formed in the North Indian Ocean moves more zonally and strike the southern peninsular India and hence excess NEMR. While, during the negative SST gradient years, the ITCZ shifts southwards over the Indian Ocean. The tropical depressions, storms and cyclones formed in the North Indian Ocean moves more northwestward direction and after crossing 15oN latitude re-curve to north-east direction towards head BoB and misses southern peninsular India and hence, deficient NEMR.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer.
Uncontrolled Keywords: air-sea interaction; annual variation; Coriolis force; El Nino-Southern Oscillation; intertropical convergence zone; monsoon; rainfall; sea level pressure; sea surface temperature; storm track; teleconnection; temperature anomaly, Bay of Bengal; Indian Ocean; Indian Ocean (Equatorial); Indian Ocean (North)
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 17 Jun 2014 10:13
Last Modified: 17 Jun 2014 10:13
URI: http://moeseprints.incois.gov.in/id/eprint/326

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