Role of Asian and African orography in Indian summer monsoon

Chakraborty, A. ; Nanjundiah, R. S. ; Srinivasan, J. (2002) Role of Asian and African orography in Indian summer monsoon Geophysical Research Letters, 29 . pp. 1989-1992. ISSN 0094-8276

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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.

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Source:Copyright of this article belongs to American Geophysical Union.
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Deposited On:30 Jan 2012 05:13
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