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Mechanisms of some tropical intraseasonal oscillations

Goswami, BN and Goswami, P (1994) Mechanisms of some tropical intraseasonal oscillations. In: Geophysical Research Letters, 19 (7). pp. 681-684.

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An underlying mechanism for two westward propagating tropical intraseasonal oscillations is discovered. Destabilization of equatorial normal modes by moist feedbacks, in particular, by evaporation-wind feedback, is responsible for both of them. The westward propagating 4-5 day oscillation and the quasi-biweekly oscillation result from destabilization of the mixed Rossby gravity (MRG) wave by the evaporation-wind feedback. The frequency and scale-selection of the unstable MRG wave depend critically on the background mean wind. In mean easterlies (as in the Pacific and the Atlantic), it results in the 4-5 day oscillation while in mean westerlies (as in the Indian Ocean during northern summer) it results in the quasi-biweekly mode.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Geophysical Union.
Department/Centre: Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Depositing User: Anka Setty
Date Deposited: 11 Dec 2006
Last Modified: 27 Apr 2011 06:31
URI: http://eprints.iisc.ac.in/id/eprint/8915

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