Role of barotropic mechanism in the development of a monsoon depression: A MONEX study |
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| Authors: | D Subrahmanyam M K Tandon L George S K Mishra |
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| Institution: | (1) Indian Institute of Tropical Metereology, 411005 Poona, India |
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| Abstract: | The role of barotropic processes in the development of a monsoon depression, formed on 5 July 1979 during MONEX observational period, is studied by considering it as a quasi-geostrophic divergent barotropic instability problem of zonal flow of 3 July 1979 at 700 mb level. Numerical solutions are obtained by initial value approach. The preferred wave has a wavelength of 2750 km, an e-folding time of 4.3 days, a period of 6.5 days and an eastward phase speed of 4.9 ms–1. Structure of preferred wave is found to be in good agreement with the observed horizontal structure of the depression at 700 mb. Poleward momentum transports are found to predominate over equatorward transports.Parts of this paper were presented at the National Symposium on Early Results of MONEX-1979. 9–12 March 1981, in New Delhi, India. |
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| Keywords: | Monsoon depression Cyclogenesis Barotropic instability |
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