青藏高原雪盖与冬季地表净辐射

COMPUTATION OF NET RADIATION OVER THE QINGHAI-XIZANG PLATEAU IN WINTER UNDER SNOW COVER

根据青藏高原地区ＳＭＭＲ遥感监测雪深分布图、雪面反照率随雪深变化规律以及１９８２～１９８３年高原地表辐射平衡观测总结的有关辐射平衡分量气候学计算方法，以旬及０．５°×０．５°经纬度网格的时空高分辨率计算了高原主体１９７８／１９７９年至１９８６／１９８７年９年冬季（１１～２月）地表净辐射的时间序列。结果表明，当月均日照百分率为０．７３，雪盖率超过６０％时，高原主体１２月份地表净辐射均值已由正转负。

Based on the charts of snow depth over the Qinghai-Xizang Plateau monitored by SMMR,the evolution of snow albedo with its depth and the algorithms of climatic computation on the components of radiation balance, which were summed up based on the data measured at the heat sources observation stations on the Plateau from September 1982 to August 1983, the surface net radiation over main of the Plateau was calculated at temporary and spatial resolution on dekad and 0.5° ×0.5° latitude-longitude cell, respectively, for November to February during 1978/1979 to 1986/1987. The results show that it will be altered from positive to negative in December, while the monthly mean of sunshine percentage is 73 and the snow cover percentage over 60.