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A Combined Barotropic-Baroclinic Instability Study of the Upper Tropospheric Tropical Easterly Jet

Mishra, SK and Tandon, MK (1983) A Combined Barotropic-Baroclinic Instability Study of the Upper Tropospheric Tropical Easterly Jet. Journal of Atmospheric Sciences, 40. pp. 2708-2723.

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Abstract

A combined barotropic-baroclinic stability analysis is performed for an upper tropospheric tropical easterly jet representing the observed mean monsoon zonal flow during summer. Numerical solutions are obtained by time integration of a 20-layer linear spectral quasi-geostrophic model, which is based on truncated Fourier series representations in y. It is seen from the growth rate and phase speed spectra that the asymmetric barotropic-baroclinic preferred wave has a wavelength of 6500 km, an e-folding time of 3.3 days, a westward phase speed of 20.5 m s− and a period of 3.8 days.The geopotential, vertical velocity and temperature fields associated with the most unstable barotropic-baroclinic wave are computed. The most unstable wave has a vertical scale of 125 mb, a meridional scale of 1650 km and a zonal scale of 2135 km. The relationship between the vertical and meridional scales of the wave with the corresponding basic zonal flow scales is discussed

Item Type: Article
Additional Information: Copyright of this article belongs to American Meteorological Society
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 04 Apr 2016 05:51
Last Modified: 04 Apr 2016 05:51
URI: http://moeseprints.incois.gov.in/id/eprint/3436

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