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Dynamics of the lower stratosphere in the wave number domain in relation to monsoon activity

Raja Rao, KS and Awade, ST and Nair, MVH (1980) Dynamics of the lower stratosphere in the wave number domain in relation to monsoon activity. Journal of Atmospheric and Terrestrial Physics, 42. pp. 867-876.

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Abstract

A study has been made of the dynamics of the lower stratosphere in the wave number domain by spherical harmonic and Fourier analyses of the grid point values of the geopotential heights at the 50 and 30 mb levels for each month of the years 1972 and 1975. Only waves 1, 2 and 3 are dominant. Transports of momentum and of sensible heat in the lower stratosphere, month by month, have been studied by computing the vertical and horizontal tilts of the ridge line. The seasonal variations in the amplitude and in the tilt with height of the ridge line of these waves have been discussed. Weakening of the equator to pole temperature gradient in 1972 and its strengthening in 1975 are striking features. Eddy transports of angular momentum and of sensible heat and energy conversion terms from eddy to zonal kinetic energy and from eddy to zonal available potential energy have been computed for January and July of 1972 and 1975 for the levels 50 and 30 mb and at 30°N and 60°N latitudes and the results have been discussed. Transfer of kinetic energy from eddies to zonal flow in 1975 suggests that the strengthening of the easterlies extends to 30°N and beyond.

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 04 Jun 2016 08:48
Last Modified: 04 Jun 2016 08:48
URI: http://moeseprints.incois.gov.in/id/eprint/3315

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