Himalayan rainfall and vorticity generation within the Indian summer monsoon

Physics

Scientific paper

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Atmospheric Processes: Climatology (1616, 1620, 3305, 4215, 8408), Atmospheric Processes: General Circulation (1223), Atmospheric Processes: Precipitation (1854), Atmospheric Processes: Tropical Meteorology

Scientific paper

The Himalayas are an integral part of the Indian monsoon dynamics. In this paper we examine the European Centre for Medium-Range Weather Forecasts 40-year Reanalysis (ERA40) data set in order to quantify the importance of Himalayan rainfall in terms of vorticity generation. We find that Himalayan rainfall is a powerful source of vorticity due to the multiplicative effect of steep vertical gradients in latent heating combined with a large Coriolis parameter. ERA40 shows a maximum in column-integrated and near-surface vorticity generation in the monsoon region over the southern slopes of the Himalayas. We estimate that the total generation of vorticity over the Himalayan region as a whole is at least half that over the Bay of Bengal. Thus Himalayan rainfall is likely to play a central role in amplifying the circulation of the monsoon.

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