Trends of Precipitation of Different Intensity in China

Based on a daily precipitation dataset of 521 meteorological stations in China,trends of regional average precipitation amounts,precipitation days and daily precipitation intensities of the 9 different precipitation classes,ranging from 0.1-4.9,5-9.9,10-16.9,17-24.9,25-37.9,38-49.9,50-74.9,75-99.9 mm to over 100 mm,were studied for the period of 1961-2000.The results revealed that,the trends of the lightest precipitation amounts were caused by the changes of precipitation days,while the changes of the heaviest precipitation amounts were mainly dominated by the precipitation intensity.The analysis on precipitation frequency and the proportion of precipitation amount of each precipitation class showed that,in spite of the decreasing trend in North China and Sichuan Basin,the precipitation frequencies and the proportions of precipitation amounts in other regions went upward significantly,indicating an increasing contribution of the heavier precipitation to the total precipitation amount.