DETECTION OF TRENDS IN CHINA'S PRECIPITATION EXTREMES
Zhai Panmao Ren Fumin Zhang Qiang (National Climate Center, Beijing,100081)
On the basis of 296 stations with complete daily precipitation records during 1951-1995, this paper mainly studied extreme changes of precipitation amount, precipitation frequency, and precipitation intensity in China. The results revealed that there are no obvious trends in annual precipitation, 1 day and 3 day maximum precipitation , and precipitation amount for daily precipitation above different intensities. However, a significant increasing trend in extremely above normal mean intensity of precipitation in China is accompanied with reduction of rain days. Regional difference is very evident in the trends of China's precipitation extremes. In eastern China, much above normal mean intensity of precipitation tends to increase. In North China, under the background of decrease in annual precipitation totals, decreasing trends are very obvious for 1-day and 3-day maximum precipitation, and for rain days with daily precipitation above 50 mm and 100 mm. However, annual mean intensity of precipitation still tends to increase in North China. Exception is in western Northwest China, where the annual precipitation amount displayed an increasing trend and the area coverage of extreme amount of high intensity precipitation displayed an increasing trend but it showed no significant trend for wet days.
【CateGory Index】： P426.614