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Super-geostrophic zonal flow and transverse circulations in a westerly jet stream

Subrahmanyam, D (1980) Super-geostrophic zonal flow and transverse circulations in a westerly jet stream. Archiv fur Meteorologie, Geophysik und Bioklimatologie, Serie A, 29 (3). pp. 219-233.

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Abstract

A parameter, for determining the minimum super-geostrophic component of zonal flow in a westerly jet stream, was identified, by invoking the condition that geostrophic motion is possible only in stably stratified media. The magnitude of super geostrophic zonal wind in the core region of an average mid-latitudinal westerly jet stream was found to be nearly 60% of the observed zonal wind speed. The non-geostrophic transverse circulations induced by this super-geostrophic zonal wind components were shown to be thermally indirect in nature and favourable for the formation of some of the observed features like jet stream front, break of the northern tropopause across the core and CAT (clear air turbulence) zones in certain regions of a westerly jet stream

Item Type: Article
Additional Information: Copyright of this article belongs to Springer-Verlag
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 07 Apr 2015 11:22
Last Modified: 07 Apr 2015 11:22
URI: http://moeseprints.incois.gov.in/id/eprint/1363

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