中文摘要：

利用2009年11月—2010年10月青藏高原玛多自动气象站辐射平衡观测资料,分析了高原两种不同下垫面辐射平衡各分量的季节平均日变化和年变化特征。结果表明,各季节的平均总辐射日变化和年变化在两种下垫面的趋势基本一致,夏季总辐射为非零值的时间在早上要比冬季早2h左右,而在傍晚出现零值的时间要比冬季晚2h左右。夏季总辐射最强、冬季最弱,年变化最小值为0.544MJ.m^-2,出现在1月;最大值为1.001MJ.m^-2,出现在7月。在11：00—16：00（北京时）之间反射辐射冬季最强、夏季最弱。这种现象与总辐射日变化趋势恰好相反,反射辐射的年变化最小值出现在2月,平均最小值为0.157MJ.m^-2;最大值出现在11月,平均最大值为0.326MJ.m^-2。1号点和2号点反射辐射差值冬季最大,达到0.06MJ.m^-2;春季最小,为0.03 MJ.m^-2。净辐射年变化最小值为-0.025MJ.m^-2,出现在12月;最大值为0.477MJ.m^-2,出现在7月。地表反射率2个观测点的变化趋势大致相同,各季节地表反射率最大值、最小值和平均值都是2号点大于1号点,平均偏大8%。

英文摘要：

Based on the radiation budget observation data from the Automatic Weather Station （AWS） at two surface stations in Maduo county of the eastern Qinghai-Xizang Plateau from November 2009 to October 2010, the mean diurnal and annual variation features of the radiation budget components were analyzed. The result shows that the mean daily variation and month mean annual variation of the solar radia- tion have the same trend at the different underlying surface. The time that appeared zero value of solar radiation in summer is early more than two hours in the morning, and than that in winter and later two hours in the dusk. The solar radiation is the strongest in summer and the weakest in winter. The maximum value appears in July, which is 1. 001 MJ · m^-2. The minimum value appears in January, which is 0. 544 MJ · m^-2. The reflection radiation value is the strongest in winter and the weakest in summer from 11：00 to 16：00. It is opposite for the trend of the solar radiation. The maximum value appears in November, which is 0. 157 MJ · m^-2. The minimum value appears in February, which is 0. 326 MJ · m^-2. The minimum value of the net radiation appears in December, which is -0. 025 MJ · m^-2. The maximum value of the net radiation appears in July, which is 0. 477 MJ · m^-2. The trends of albedo are different at two sites. The season average albedo at the second site is larger 8 % than the first site.