Impact of climate change on precipitation in the upstream of Liujiaxia reservoir

Selecting the daily precipitation, temperature, evaporation, etc., in 16 meteorology stations in the upstream Liujiaxia reservoir, applying climatic change tendency analysis, we analyzed the change rules of the climatic factors, such as precipitation, rainy days, temperature, evaporation. The results showed that from 1960 to 2007, the precipitation in the upstream Liujiaxia reservoir presents a weak yearly declining trend. The yearly rainy days has dropped since 1960. After water storage in the reservoir, the precipitation in the year has decreased slightly. After the water storage in the reservoir, the rainy days are decreasing in summer and autumn, but they are increasing in spring and winter. The annual mean temperature has assumed a remarkable increasing trend since 1960, the most warming contribution to the upstream of Liujiaxia reservoir is winter warming.