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Warming of the Kathmandu Valley: Promotion Towards Global Warming

Research By: Pujya Wagle/D.B. Kattel

Nepal Academy of Science and Technology (NAST)

ABSTRACT

Warming trends in the Kathmandu valley of 30 years from 1976 to 2006 were investigated from the two major parameters temperature and precipitation based on the annual and seasonal distributions. Temperature trends change from season to season and the greatest warming trend has observed in the post monsoon season. A preliminary analysis showed high year-to-year fluctuation. A distribution of seasonal and annual temperature trends show high rates of warming in the core areas of the valley and was found ranging from 0.5°C to 0.8°C per decade. We suggest that the high warming rate observed in Kathmandu is due to its topographical characteristics, tremendous haphazard urbanization, and remarkable population growth, radical changes in land use and land cover and increase in the concentrations of greenhouse gases from different sources. These factors could have played an important role in the last two decades to make the valley more sensitive to climatic change. From the study, it has observed that the recent warming trend is promoted towards global warming. Key words: climate change, green house gases, Kathmandu valley, precipitation, and temperature trend. 2007

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