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Role of Asian and African orography in Indian summer monsoon

Chakraborty, A and Nanjundiah, RS and Srinivasan, J (2002) Role of Asian and African orography in Indian summer monsoon. In: Geophysical Research Letters, 29 (20).

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Abstract

Role of Asian and African orography in the Indian summer monsoon has been investigated using a general circulation model. Orography of Asian region west of 80°E appears to have more impact on the Indian summer monsoon rainfall than the orography to the east of 80°E. It has been found that removal of the African orography increases the seasonal precipitation over the Indian sub-continent by 28%, whereas removal of orography over the entire globe reduces it by 25%. Moreover, there was a substantial delay in all-India monsoon onset in the experiment in which mountains were removed globally, mainly due to the intrusion of midlatitude dry air west of 80°E. The increase in precipitation in which orography over Africa was removed was due to the positive feedback between the wind over the East African coast/Arabian Sea and precipitation over Bay of Bengal, with the latter leading the former by about 2 days.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Geophysical Union.
Department/Centre: Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited: 31 May 2006
Last Modified: 27 Aug 2008 12:06
URI: http://eprints.iisc.ernet.in/id/eprint/7215

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