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Northward propagation of the 30–50 day mode in the Indian monsoon region

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Abstract

A highly simplified zonally symmetric system of equations is used to understand the basic mechanism of the northward movement of the 30–50 day oscillation in the Indian monsoon region. Zonally symmetric perturbations are used on the July mean basic flow in the Indian region. A two-level model is employed. A simple parametrization of cumulus heating is included. An expression is derived for the northward phase speed. A right order of magnitude for the phase speed is obtained. The northward movement appears to be controlled by the basic zonal wind profile and cumulus heating.

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Authors and Affiliations

  1. Physical Research Laboratory, Navrangpura, 380 009, Ahmedabad, India

    R N Keshavamurty, V Krishnakumar & V Kasture

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  1. R N Keshavamurty
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  2. V Krishnakumar
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  3. V Kasture
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Keshavamurty, R.N., Krishnakumar, V. & Kasture, V. Northward propagation of the 30–50 day mode in the Indian monsoon region. Proc. Indian Acad. Sci. (Earth Planet Sci.) 97, 127–136 (1988). https://doi.org/10.1007/BF02861848

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  • DOI: https://doi.org/10.1007/BF02861848

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