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Summer Research Fellowship Programme of India's Science Academies

Hydrometeorological study of the Himalayan region

Thamanna Shahanas K P

University of Hyderabad, Gachibowli, Hyderabad, 500046

Dr. R. D. Deshpande

Geosciences Division, Physical Research Laboratory (PRL), Navrangpura, Ahmedabad, 380009

Abstract

The Himalayan mountain range plays a key role in modulating the regional monsoon climate in the Indian subcontinent and act as a key source of fresh water for more than a billion people. It supports one of the most heavily irrigated regions in the world and serves as the backbone of the region’s economy. The Himalayas are prone to rapid environmental changes and extreme events (floods, landslides, droughts, rainstorms). As well as the alarming rate of urbanization and population growth in fact urge us to think about a future with less availability of water. Hydrometeorology varies across this region. The entire range can be divided into three on the basis of Hydrometeorology. The path and amount of vapor with reference to isotopic characteristics of the precipitation collected may help to unveil the story behind it. The regional climate of Himalayas is dominated by two distinct circulation regimes of the regional atmosphere: the Indian summer monsoon (ISM) and the western disturbances (WD) period. The backward wind trajectory analysis shows a clear influence of inland vapor source over the entire stretch of the Himalayas during the period of ISM and WD.

Keywords: Himalayan precipitation, stable isotopes, Western disturbances (WD), Indian summer monsoon (ISM)

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