The variation analysis of land surface albedo in Beijing in recent ten years

The surface land albedo is an important parameter of the energy balance. It is very significant for the urban micro-climate and environment to research the variation and analysis of land surface albedo. In this paper, the variation of land surface albedo in Beijing in recent ten years, the correlation of the albedo and underlying surface type, the correlation of the albedo and LST and NDVI were studied based on ETM+ data in 2010 and 1999. The conclusions of the paper are as followed: (1) The average albedo of second, third, fourth and fifth ring in Beijing were gradually increased. The albedo of Beijing area in 2010 reduced 0.0075 compared with 1999; the albedo of main city area within fifth ring road reduced 0.0108; the albedo of the area between third ring road and fourth ring was the biggest drop range area, and it reduced 0.0135; the albedo of the area without fifth ring was the smallest range area, it reduced 0.0048. (2) The average albedo of land cover types in order from high to low: new construction areas, farmland, bare land, woodland, villages, construction zone, paddy fields, water. The change of land surface type led to the albedo difference in Beijing between 2010 and 1999.