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Maximum Temperature Trends in the Himalaya and Its Vicinity: An Analysis Based on Temperature Records from Nepal for the Period 1971–94 |
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Author:
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ARUN B. SHRESTHA, CAMERON P. WAKE, PAUL A. MAYEWSKI, AND JACK E. DIBB |
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Publisher:
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Journal of Climate/American Meteorological Society |
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Published Year:
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1999 |
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Theme:
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Climate science |
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SubTheme:
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Analysis of past climate trends |
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Description
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Analyses of maximum temperature data from 49 stations in Nepal for the period 1971–94 reveal warming trends after 1977 ranging from 0.068 to 0.128C yr21 in most of the Middle Mountain and Himalayan regions,
while the Siwalik and Terai (southern plains) regions show warming trends less than 0.038C yr21. The subset
of records (14 stations) extending back to the early 1960s suggests that the recent warming trends were preceded
by similar widespread cooling trends. Distributions of seasonal and annual temperature trends show high rates
of warming in the high-elevation regions 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
highlight the influence of monsoon circulation.
The Kathmandu record, the longest in Nepal (1921–94), shows features similar to temperature trends in the
Northern Hemisphere, suggesting links between regional trends and global scale phenomena. However, the
magnitudes of trends are much enhanced in the Kathmandu as well as in the all-Nepal records. The authors’
analyses suggest that contributions of urbanization and local land use/cover changes to the all-Nepal record are
minimal and that the all-Nepal record provides an accurate record of temperature variations across the entire region. |
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Posted By
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Journal of Climate/American Meteorological Society |
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