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Variation Trends of Snow Cover Over the Tibetan Plateau and Their Relations to Temperature and Precipitation

Ke Changqing 1 , Li Peiji 2 and Wang Caiping 3 (1 Nanjing Institute of Geography and Limnology, 210008; 2 Lanzhou Institute of Glaciology and Geocryology, Chinese Academy of Sciences, 730000; 3 Jiangsu Petrochemical Institute, Changzhou,  
In this paper daily snow depth data, together with monthly average temperature and monthly total precipitation, at 60 primary weather stations from 1957 to 1990 were analysed by using ARMA (p,q) and multiple linear regressive analysis. The results show that an increasing trend of snow volume is almost omnipresent over the entire Tibetan Plateau, with some local decreasing trends. Its variation trend coincides with the recent snow accumulation increases in Antarctica and Greenland, therefore, snow cover on the Tibetan Plateau will increase with global warming. The secular trend of cold season temperature and precipitation in the Tibetan Plateau is increasing too. A significant positive correlation exists between snow cover and precipitation, but the correlation between snow cover and temperature is negative over the Tibetan Plateau. In recent 34 years, cold season temperature in the Tibetan Plateau has increased 0.51℃. Meanwhile, the annual increase rate of cold season precipitation is 1.1%, and annual accumulation of snow cover increases 1.7%. The increase of snow cover results from the increase of precipitation during the cold seasons with global warming.
【CateGory Index】: P426.635(7)
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