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Title: Low frequency oscillations in the tropical stratospheric temperature field during winter time
Authors: Devasia, C V
Reddi, C Raghava
Issue Date: Dec-1992
Publisher: NISCAIR-CSIR, India
Abstract: The present paper is a study on the long period radiance oscillations in the winter time stratospheric temperature field over the Indian subcontinent. The stratospheric radiance data used in this study were recorded at Trivandrum from the stratospheric sounding unit (SSU) on board the NOAA-9 satellite. It has been found that the dominant components of the stratospheric radiances have periods of 32, 15, 11, and 7 days. The altitude and latitude variations of the phase and amplitude of the observed long period oscillations are interpreted in terms of the propagation characteristics of the tropical and extratropical long period temperature oscillations. Making use of the available zonal wind data over Trivandrum (8.5°N) and Balasore (21.5°N) along with the SSU radiance data for the winter time, it is shown that the observed 32, 15, 11 and 7-day oscillations are the winter time disturbances in the midlatitudes penetrating into the low latitudes during weak equatorial westerlies.
Page(s): 338-346
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.21(6) [December 1992]

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