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Title: Planetary scale temperature disturbances in the stratosphere over the Indian zone
Authors: Devasia, C V
Reddi, C Raghava
Issue Date: Feb-1992
Publisher: NISCAIR-CSIR, India
Abstract: The radiance data from the NOAA-9 meteorological satellite were recorded at Trivandrum (8.5°N, 76.9°E), and analysed to study the large scale temperature oscillations in the stratosphere over low latitudes. Temperature oscillations of 9-day and I6-day periods are found to be present in the 29-50 km height range with a significant increase in their amplitudes but very small change of their phases with increasing altitudes. The amplitude and phase of each oscillation exhibit substantial changes with latitude, comprising a trend and large fluctuations. The large fluctuations in phase of the oscillations could be due to interference between closeby frequencies because of the finite width of the weighting functions of the NOAA-9 radiances, or the finite width of the spectral components computed when closeby frequencies exist simultaneously. The third possibility is the interference between extra-tropical waves propagating towards the equator interfering with the equatorial waves. From the mean trends of the phase of the two oscillations with latitude, it is inferred that extra-tropical waves propagate towards the equator, and equatorial waves propagate to extratropics beyond 15°N. The propagation of extra-tropical waves towards equator is shown to be possible, when the observed zonal winds in the low latitude stratosphere are westerly.
Page(s): 33-41
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.21(1) [February 1992]

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