Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/25829
Title: Seasonal variation of horizontal winds and momentum fluxes from 53 MHz VHF radar observations over Gadanki, a tropical station in India
Authors: Vasantha, B
Rao, D Narayana
Rao, S Vijaya Bhaskar
Ratnam, M Venkat
Mohan, K
Kamala, S
Issue Date: Oct-2002
Publisher: NISCAIR-CSIR, India
Abstract: Diurnal, monthly and seasonal variation of horizontal winds and momentum fluxes in troposphere and lower stratosphere are presented in this study. Data collected using Indian MST radar for a period of three years (September 1995-August 1998) are used for the present study. The observed mean zonal wind is westward (easterly jet) with a maximum of ~42 ms-1 ¬†around 16 km during the monsoon season. The maximum mean meridional wind is ~5 ms-1 and is north ward during winter and 3 ms-1 in the altitude range of 10-14 km during summer. The maximum zonal variances are ~40m2s-2 at an altitude of 16 km during monsoon season. The meridional wind variances are of 9 m2s-2 at ~15 km during winter. The maximum vertical shears of zonal winds occur at altitudes of 12 and 18 km during the monsoon and post- monsoon seasons, respectively. The vertical shears of meridional winds are maximum at an altitudes of 11 and 15 km during winter season. In summer, the maximum vertical flux of eastward momentum is about 1.0 m2s-2 around 11km, and westward momentum flux of 0.3 m2s-2 is observed around 14.5 km during post-monsoon.The diurnal variations show different values on individual days.
Page(s): 250-263
URI: http://hdl.handle.net/123456789/25829
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.31(5) [October 2002]

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