Circulation characteristics over the Himalayas during winter season |
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| Authors: | P L S Rao |
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| Institution: | (1) IBM India Research Laboratory, New Delhi, |
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| Abstract: | Summary ?During winter season, atmospheric systems, which traverse from west to east interact with the Himalayan massif and produce
widespread rainfall over North India. In this study, we made an endeavor to examine the mean circulation features and large-scale
budgets of kinetic energy, heat and moisture over Himalayas and the adjoining domain for winter season. The time-mean circulation
is bifurcated into stable mean and transient eddy parts and examined the mean component of the circulation. The uninitialized
daily analyses of European Centre for Medium range Weather Forecasts (ECMWF) for five winter seasons (1986–90) comprising
December, January and February (DJF) have been used for the purpose.
We noticed certain zones of strong activity over Iran, Afghanistan, and West China regions during winter season. These are
characterized by intense vertical motions, cyclonic vorticity and adiabatic generation of kinetic energy. The features noticed
over these zones include strong horizontal convergence of heat and moisture. These zones are further characterized by massive
adiabatic conversion of available potential energy to kinetic energy. These features are conducive for the growth of atmospheric
systems, which traverse over the zones and produce precipitation subsequently.
Received November 16, 2000; revised February 5, 2002 |
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