Characteristics of air temperature and precipitation in different regions of China from 1951 to 2009

The climatic regions in China were divided into 11 types for studying the characteristics of climatic change in the different regions of China.Based on the monthly and annual air temperature and precipitation data in 194 weather stations from 1951 to 2009 in China,the characteristics of mean annual and seasonal air temperature and precipitation in each climatic region and in the whole China were analyzed.The results indicate that the warming trend is significant in each climatic region and in the whole China,especially in the recent 20 years.The warmest year from the historical record is 2007.The ascending trend of temperature is more obvious in winter than in spring,while temperature in summer is almost unchanged.The maximum mean annual total precipitation in the whole China occurs in 1950s and the minimum happens in 2000s.Annual precipitation reduces significantly in the North China.Among the four seasons,precipitation in summer shows slightly increased fluctuation.The distributions of precipitation in different regions show clear differences between the north and south China.