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THE SEASONAL VARIATION OF SURFACE HEATING FIELD OVER THE NORTHERN QINGHAI-XIZANG PLATEAU

Ji Guoliang Zuo Jiling Lu Lanzhi (Lanzhou Institute of Plateau Atmospheric Physics, Chinese Academy of Sciences, Lanzhou,Gansu 730000)  
In this paper, the characteristics for seasonal variation of surface heating field are analysed by using the data of radiation budget observed at Wudaoliang during the period from September 1993 to August 1995. The results show that:in spring and autumn, the intensity of surface heating field increases and decreases rapidly, respectively, which cause the season transition. When the duration of surface snow cover is long and intensity of surface heating field is weakness in winter, the intensity of surface heating field is strong in next summer. The seasonal variation of surface heating field is obvious:the intensity is strong in summer and weakness in winter. When the duration of surface snow cover is long, surface albedo is large and the heat released from soil is smaller than that in no snow cover cause the surface heating field acts as a heat sink.
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