A Note on the Instability of the African Easterly Jet

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  • 1 U.K. Universities' Atmospheric Modelling Group, Department of Meteorology, University of Reading, England
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Abstract

A stability analysis has been performed for an easterly lower tropospheric jet which approximates the observed flow over West Africa during summer. The most unstable disturbance has a growth rate of 0.27 day−1, a wavelength close to 4000 km and a phase speed of about 9 m s−1. Although gross features of its energetics are similar to those found by Rennick in a recent theoretical study, there are significant differences in horizontal structure. The present results appear to be in closer agreement with observation.

Abstract

A stability analysis has been performed for an easterly lower tropospheric jet which approximates the observed flow over West Africa during summer. The most unstable disturbance has a growth rate of 0.27 day−1, a wavelength close to 4000 km and a phase speed of about 9 m s−1. Although gross features of its energetics are similar to those found by Rennick in a recent theoretical study, there are significant differences in horizontal structure. The present results appear to be in closer agreement with observation.

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