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《ACTA GEOGRAPHICA SINICA》 1998-03
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SPATIAL AND TEMPORAL CHARACTERISTICS OFSNOW COVER OVER THE QINGHAI XIZANG PLATEAU

Ke Changqing (Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008) Li Peiji (Lanzhou Institute of Glaciology and Geocryology, CAS, Lanzhou 730000)  
In this paper three complete Qinghai Xizang Plateau snow cover data sets consisting of SMMR microwave pentad snow depth maps covering the period 1978~1987, operational NOAA weekly snow cover extent charts during the period between 1966~1989, and daily snow depth data at 60 primary weather stations cover the 36 year period 1957~1992, were used to investigate the spatial and temporal characteristics of snow cover over the Qinghai Xizang Plateau by using EOF method, spectral analysis as well as trend estimate analysis, and so on. The results showed that the spatial distribution of snow cover over the Qinghai Xizang Plateau is very inhomogeneous. The heavy snow cover in periphery, especially in western and eastern parts of the Qinghai Xizang Plateau evidently compares with the light snow cover in the vast interior of the Qinghai Xizang Plateau. The heavy snow cover region in the east of the Qinghai Xizang Plateau is the most significant region of the interannual variation of snow cover on the Qinghai Xizang Plateau, and dominates the interannual variation of snow cover in the whole Plateau. There is an opposite phase relation between the western parts and the eastern parts of the Qinghai Xizang Plateau in the interannual fluctuation of snow cover. The interannual fluctuation of snow cover over the Qinghai Xizang Plateau is at a quasi periodicity of about three years. This indicates that the interannual fluctuation of snow cover over the Qinghai Xizang Plateau possibly is resulted from sea atmosphere circulation anomolies in equatorial pacific. There is an augmentative trend of inter annual fluctuation amplitude of snow cover over the Qinghai Xizang Plateau from 1960s to 1980s. The results of trend estimmate by using ARMA imply that the increasing trends of snow volume are almost omnipresent over the entire Qinghai Xizang Plateau, whereas the decreasing trends of snow volume principally limit to local areas. Therefore, snow cover on the Qinghai Xizang Plateau will increase with global warming.
【Fund】: 中国科学院“八五”重大应用项目 中国科学院“冰冻圈动态变化”基础研究课题
【CateGory Index】: P426.635
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【Co-references】
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