,Trend of extreme precipitation events over China in last 40 years

• 作 者: Zhang Da-Quan Feng Guo-Lin Hu Jing-Guo
• 机 构: College of Physics Science and Technology,Yangzhou University,Yangzhou 225009,China;Laboratory for C
• 出 处: 中国物理B（英文版）
• 发表日期: 2008年2期
• 关键词: extreme precipitation events frequency abrupt change extreme events

Using the daily precipitation data of 740 stations in China from 1960 to 2000,the analysis on the variations and distributions of the frequency and the percentage of extreme precipitation to the annual rainfall have been performed in this paper.Results indicate that the percentage of heavy rains (above 25mm/day) in the annual rainfall has increased,while on average the day number of heavy rains has slightly reduced during the past 40 years.In the end of 1970s and the beginning of 1980s,both the number of days with extreme precipitation and the percentage of extreme precipitation abruptly changed over China,especially in the north China.By moving t test,the abrupt change year of extreme precipitation for each station and its spatial distribution over the whole country are also obtained.The abrupt change years concentrated in 1978-1982 for most regions of north China while occurred at various stations in south China in greatly different/diverse years.Besides the abrupt change years of extreme precipitation at part stations of Northwest China happened about 5 years later in comparison with that of the country’s average.