Potential impact of climate change on snow cover area in the Tarim River basin |
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Authors: | Xu Changchun Chen Yaning Li Weihong Chen Yapeng Ge Hongtao |
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Institution: | (1) Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences , Urumqi, 830011, China;(2) Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China;(3) Graduate School, Chinese Academy of Sciences, Beijing, 100039, China;(4) Xinjiang Geomatics Center, Urumqi, 830002, China |
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Abstract: | Two data sets, annual temperature and precipitation time series from 19 observation stations in the Tarim River basin covering
1958 through 2002, were investigated by non-parametric tests to detect the trend and features of climate change and variability.
Based on these data, the snow cover area (SCA) in situ for the period 1982–2001 was further analyzed to examine the effect
of climate change on snow. The results showed that both the temperature and precipitation had a jump in the mid 1980s and
significantly increased in winter and summer, respectively. The SCA of the entire basin showed a slowly increasing trend.
Responses of the SCA to temperature and precipitation in the northern, western and southern regions showed that the effect
of precipitation on SCA is larger than that of temperature. In vertical direction, the SCA in the zone below 2,500 m a.s.l.
kept a slow increase, but that in the zone above 2,500 m a.s.l. was inching down. Comparatively, the lower altitude zone was
apt to be affected by precipitation, while the higher altitude zone tended to be influenced by temperature. The mid zone from
2,500 to 5,000 m was the area most sensitive to and affected by climate change. Compared with that in the 1980s, both the
snowing and melting rates were higher in the 1990s. Correlation analysis implied that the SCA change in the cold season was
positively correlated with the contemporary precipitation change, but had no strong correlation with the contemporary temperature
change. |
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Keywords: | Climate change Snow cover area Nonparametric test Tarim River basin |
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