Xinping Xu¹, Shengping He², Yongqi Gao³, Tore Furevik², Wang Huijun⁴, Fei Li⁵ and Fumiaki Ogawa⁶, (1)Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China, (2)Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, Norway, (3)Nansen Environmental and Remote Sensing Center, Bergen, Norway, (4)Nanjing University of Information Science and Technology, Nanjing, China, (5)Norwegian Institute for Air Research, ATMOS, Kjeller, Norway, (6)University of Bergen and Bjerknes Centre for Climate Research, Bergen, Norway