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An analytic study on the horizontal motion of monsoon depressions

Mishra, SK and Chakraborty, DR and Desai, SS (1983) An analytic study on the horizontal motion of monsoon depressions. Archives for Meteorology, Geophysics, and Bioclimatology Series A, 32 (1-2). pp. 35-53.

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Abstract

A quasi-geostrophic, linear, barochnic, diabatic model, which also includes the surface friction and the orography is utilized for identifying the various physical processes responsible for the westward motion of monsoon depression in the lower troposphere. For this purpose, the geopotential, resembling the mean observed state of a monsoon depression, is prescribed by analytical functions at an initial time. w is obtained as the analytic solution of the omega equation for the various physical processes and it is compared with the observed distributions. The role of orography in inducing the westward motion to the wave is investigated and found to be most important in the boundary layer. The Laplacian of thermal advection and the differential vorticity advection are the other two important physical processes responsible for the movement of wave in the westward direction in the boundary layer. The necessity for the vertical transport of cyclonic vorticity ahead of monsoon depression from the boundary layer to the upper layer is inferred from the results. The physical processes responsible for the northward motion of the wave are also identified.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer-Verlag
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 17 Apr 2015 10:48
Last Modified: 17 Apr 2015 10:48
URI: http://moeseprints.incois.gov.in/id/eprint/1294

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