中文摘要：

利用＂全球协调加强观测计划（CEOP）之亚澳季风青藏高原试验＂（CAMP/Tibet）在藏北高原的BJ站、NPAM站及中国科学院珠穆朗玛峰大气与环境综合观测研究站、纳木错多圈层相互作用综合观测研究站和藏东南高山环境综合观测研究站2007年的辐射观测资料,分析了这些地区不同下垫面地表辐射各分量及地表反照率的日变化和月际变化特征。结果表明,向下短波辐射受太阳高度角的影响存在明显的日变化和月际变化;向上短波辐射的月际变化基本与总辐射一致,在个别月份由于高原积雪造成地表反照率较高,从而使晴天向上短波辐射全年较高;向下长波辐射存在基本的季节变化,最大值出现在天空总云量较多的夏季（6～8月）,最小值出现在冬季（12月和1月）;向上长波辐射基本上都是夏季为全年最大,冬季为全年最小。这与地表温度的年变化情况相一致。高原不同地区各季节晴天地表净辐射存在差异,NPAM站和藏东南站由于下垫面植被覆盖较好,净辐射值各季节均高于其它各站;NPAM站、纳木错站和珠峰站地表反照率日变化曲线呈＂U＂型,BJ站和藏东南站日变化相对复杂,藏东南站全年月平均地表反照率较小且变化不大,其他各站存在基本的年变化趋势。

英文摘要：

Using the data observed at the stations of BJ and NPAM of CEOP/CAMP-Tibet（Coordinated Enhanced Observing Period（CEOP） Asia-Australia Monsoon Project（CAMP） on the Tibetan Plateau）,Qomolangma Station for Atmospheric and Environmental Observation and Research,Chinese Academy of Sciences（QOMS/CAS）,Nam co Station for Multisphere Observation and Research,Chinese Academy of Sciences（NAMOR/CAS） and Southeast Tibet Station for Alpine Environment Observation and Research,Chinese Academy of Sciences（SETS/CAS） in 2007,the diurnal and monthly variation characteristics of surface radiation and surface albedo in these areas over different landscapes are analyzed.The results indicate that downward shortwave radiation determined by solar altitude has obvious diurnal and monthly variations.The monthly variation of upward shortwave radiation is in accord with the annual variation of global radiation,and upward shortwave radiation in some months is higher than that in other months due to the snow on the Plateau and the high albedo during full year.Upward shortwave radiation at BJ station is mostly influenced by surface albedo,and global radiation plays a more important role for that at QOMS/CAS and SETS/CAS.Downward longwave radiation has basic seasonal variation,and that is the highest in summer（from June to August） and the lowest in winter（from December to January）.Upward longwave radiation is almost the highest in summer and the lowest in winter,and the monthly variation is in accord with the annual variation of surface temperature.The net radiation variation on clear day for each season in different areas over the Tibetan Plateau is obvious.And the net radiation of NPAM and SETS/CAS stations for four seasons are all higher than that of other stations because of the better cover of surface vegetation.The diurnal variation curves of surface albedo at NPAM station、 QOMS/CAS and NAMOR/CAS present typical ＂U ＂ shape,but the curves shape at BJ and SETS/CAS stations is more complicated.The monthly