Climate Evolution in the Shiyang River Basin of China since 10 ka BP

Based on the study results of water resources, climate and glacier variations in the Shiyang River Basin and its adjacent regions, the features of dryness/wetness evolution since 10 ka BP are investigated and its variation series is built. There are seven wet and six dry climatic phases recognized. Furthermore, there are four features in the main climate change in the last 50 a. It is found that the mean annual precipitation in the oasis in the region from 1971 to 2000 was higher than that from 1951 to 1980, but the temperature change in the oasis was not evidence. Meanwhile, the precipitation in the edge of the high mountains and the desert decreased evidently, with an increasing temperature. Furthermore, the mean annual evaporation in most of the region had decreased 10 similar to 131 mm, the days of the mean annual sand storm and the thunderstorm had decreased too.