Abstract:

Based on the NOAA AVHRR OLR product,the interannual variation of OLR in three gorges reservoir and southwest China as well as the middle and lower reaches of Yangtze river was analysed.And by using the MODIS surface albedo product,the change of albedo after and before the reservoir water storage was studied.The following conclusions were obtained.There are similar tendencies of the interannual variation of OLR in the three areas,they indicate the same climatological change characters.The yearly average OLR increased 40、45、49 W/m2 during 2001-2011compared that during 1990-2000 in three gorges reservoir 、southwest China、 the middle and lower reaches of Yangtze river.The increase of yearly OLR is the results of decrease of numbers of pecipitable days in these areas.The changes of surface albedo after and before the reservoir water storage were +0.089%、+0.08%、-003%、+0.44% in spring、summer 、autume 、winter respectively. The little change of albedo explains the minor variations in surface types and vegetation growth which represent the ecological environment of the three gorges dam.〖