using the observation data such as ground temperatures and precipitation of the 13 weather stations in Heihe River Basin in 1960 – 2006.analyzing the annual climate change characteristics and the cause of drought in this drainage area. The results is that because of the topography, altitude and the different scales of the atmospheric circulation, the precipitation in this drainage area is very asymmetry in north and south, and showing that the southeast is more while the northwest is less. But the rainy day...
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