Maximum temperature trends in the Himalaya and its vicinity: An analysis based on temperature records from Nepal for the period 1971-94

Analyses of maximum temperature data from 49 stations in Nepal for the peri od 1971-94 reveal warming trends after 1977 ranging from 0.06 degrees to 0. 12 degrees C yr(-1) in most of the Middle Mountain and Himalayan regions, w hile the Siwalik and Terai (southern plains) regions show warming trends le ss than 0.03 degrees C yr(-1). The subset of records (14 stations) extendin g back to the early 1960s suggests that the recent warming trends were prec eded by similar widespread cooling trends. Distributions of seasonal and an nual temperature trends show high rates of warming in the high-elevation re gions of the country (Middle Mountains and Himalaya), while low warming or even cooling trends were found in the southern regions. This is attributed to the sensitivity of mountainous regions to climate changes. The seasonal temperature trends and spatial distribution of temperature trends also high light the influence of monsoon circulation. The Kathmandu record, the longest in Nepal (1921-94), shows features simila r to temperature trends in the Northern Hemisphere, suggesting links betwee n regional trends and global scale phenomena. However, the magnitudes of tr ends are much enhanced in the Kathmandu as well as in the all-Nepal records . The authors' analyses suggest that contributions of urbanization and loca l land use/cover changes to the all-Nepal record are minimal and that the a ll-Nepal record provides an accurate record of temperature variations acros s the entire region.