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Dynamics of intensification of the boreal summer monsoon flow during IOD events

Sundaram, S and Krishnan, R and Dey, A and Swapna, P (2010) Dynamics of intensification of the boreal summer monsoon flow during IOD events. Meteorology and Atmospheric Physics, 107 (1). pp. 17-31.

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The present study focuses on understanding the dynamics of intensification of the boreal summer monsoon cross-equatorial flow generally observed during positive-Indian Ocean Dipole (IOD) events, by taking 1994 as a case study. In particular, the influence of the anomalous divergent motions during 1994 (i.e., east-west circulation over equatorial Indian Ocean and the monsoon Hadley-type circulation) on the intensification of summer monsoon cross-equatorial flow is investigated. This problem is examined using diagnostic analyses and simulation experiments from a multi-level global atmospheric model forced with observed diabatic heating. The results suggest that the transfer of kinetic energy (KE) from the divergent motions to the rotational flows can be very effective during IOD periods like 1994; and provides a plausible explanation for the increase of KE of the monsoon cross-equatorial flow over Bay-of-Bengal and adjoining areas. The study also investigates the enhanced activity of westward propagating disturbances observed during 1994 over the monsoon region.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer
Uncontrolled Keywords: atmospheric circulation; atmospheric modeling; atmospheric motion; diabatic process; geostrophic flow; kinetic energy; monsoon; summer; wind velocity, Bay of Bengal; Indian Ocean
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 22 May 2015 11:39
Last Modified: 22 May 2015 11:39

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