Retrieval of the Surface Albedo under Clear Sky over China and Its Characteristics Analysis by Using MODIS Satellite Date
利用MODIS卫星资料反演中国地区晴空地表短波反照率及其特征分析

Using MODIS surface albedo product (MOD43B1) of 2002, combining elevation and land cover data, surface albedo under clear sky over China area is computed and its spatial and temporal distribution is analyzed. The ground measurements of albedo at Grz (in the western Tibetan Plateau) are used to validate the satellite data. The result shows that satellite measurement can reflect the trend of surface albedo, and MODIS albedo meets the ground-based measurements well. The year-average albedo is correlative with elevation, and high value center of albedo is corresponding with mountain area. In winter and spring, high value centers of albedo are in mountain area because of the snow cover; and in summer and autumn, deserts become high value centers of albedo because of low soil moisture and low vegetation cover. The temporal variation of albedo of representative land cover types is calculated. The results show that the temporal variation of surface albedo over most land cover is distinct, and the albedo is larger in spring and autumn.