Characteristics of Area Precipitation in Xinjiang Region with Its Variations

Using the data of precipitation including 144 meteorological and hydrological stations in Xinjiang from 1961 to 2005, annual and seasonal distributing features and its variations of area precipitation in Xinjiang are discussed by empirical orthogonal function (EOF), multiple regression analysis, maximum entropy analysis and so on, combining with 1 km×1 km gridding data of digital elevation model (DEM). Results show that mean annual area precipitation in Xinjiang region is 2724.6×10⁸t and mean annual precipitation is 165.5 mm. For space distribution, area precipitation of Tianshan Mountains, Northern Xinjiang and Southern Xinjiang respectively occupy about 40.4%, 34.3% and 25.3% of all regions, and its mean annual precipitation are 409.1 mm, 277.3 mm and 66.2 mm, respectively. Area precipitation in summer is the most one about 54.4% of all year, 23.6% in spring, 16.5% in autumn, and the least 5.5% in winter. In the last 45 years area precipitation in Xinjiang presents clear annual variations and increasing trend, especially since 1987.