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Anomalous behaviour of the Indian summer monsoon 2009

Preethi, B and Revadekar, JV and Kripalani, RH (2011) Anomalous behaviour of the Indian summer monsoon 2009. Journal of Earth System Science, 120 (5). pp. 783-794.

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Abstract

The Indian subcontinent witnessed a severe monsoon drought in the year 2009. India as a whole received 77 of its long period average during summer monsoon season (1 June to 30 September) of 2009, which is the third highest deficient all India monsoon season rainfall year during the period 1901-2009. Therefore, an attempt is made in this paper to study the characteristic features of summer monsoon rainfall of 2009 over the country and to investigate some of the possible causes behind the anomalous behaviour of the monsoon. Presence of El Niñno like conditions in the Pacific and warming over the equatorial Indian Ocean altered the circulation patterns and produced an anomalous low level convergence and ascending motion over the Indian Ocean region and large scale subsidence over the Indian landmass. Furthermore, the crossequatorial flow was weak, the monsoon was dominated by the slower 30-60 day mode, and the synoptic systems, which formed over the Bay of Bengal and the Arabian Sea, did not move inland. All the above features resulted in less moisture supply over the Indian landmass, resulting in subdued rainfall activity leading to a severe monsoon drought during 2009.

Item Type: Article
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Uncontrolled Keywords: drought; El Nino; monsoon; oceanic circulation; rainfall; sea surface temperature; subsidence; summer; synoptic meteorology, Arabian Sea; Bay of Bengal; Indian Ocean; Pacific Ocean
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 27 Jul 2014 09:39
Last Modified: 27 Jul 2014 09:39
URI: http://moeseprints.incois.gov.in/id/eprint/714

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