Diagnostic study of vertical motion vis-à-vis Large scale cloud systems
In this paper we present results of vertical velocities computed for a monsoon depression over India. The vertical velocities were calculated at intervals of 100 mb from 1000 to 100 mb with the help of a 10-layer geostrophic model. The computed omega field has been compared with the composite nephanalysis received from APT bulletins from Bombay.
It is found that the field of vertical motion computed by the 10.layer model agrees fairly well with the configuration of large scale cloud systems.
The effect of surface friction and topography was included as a lower boundary condition on the 10-layer model. The vertical motion at the top of the friction layer was computed on the basis of the Ekman spiral. The paper discusses the results of the other types of frictional convergence and their effect on the omega field.
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