Change assessment of albedo for different humanistic regions

Albedo is one of the most essential parameters for the radiation energy budget of land surface from analysis of the land-surface process which has influence on the regional climate and even on the global climate. This paper discussed the variation of the albedo from 2000 to 2008 on two administrative areas in China with very different humanistic and natural characteristics, one is Maduo County in Qinghai-Tibet Plateau, and the other is Beijing. The results showed that the annual albedo during 9 years presented increased trend in Maduo, while slightly decreased trend in Beijing. However, the albedo during the growing season showed decreased trends in both of the two regions. It is inferred that the changes of vegetation are the main factors causing albedo alteration in Beijing, while both vegetation and snow cover are main factors in Maduo.