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Characteristics of Climatic Changes and Catastrophe of Extreme Precipitation in Hunan in Recent 40 Years

Luo Bailiang Zhang Chao Lin Hao(Institute of Hunan Meteorology,Changsha 410007)  
According to the data of daily precipitation in Hunan from 1961 to 2004,the climatic changes and the catastrophe of extreme precipitation events are analysed.The results show that the amount and days of extreme precipitation has significantly increased in the recent 44 years.1993 is the mutational site of significant increase.Between 1994-2004 and 1991-1993 the difference of extreme precipitation amount is 126.4 mm and the difference of extreme precipitation days is 2.05 d.The intensity of extreme precipitation has no significant mutation but there is an upward trend after 1993.The increase of the intensity of extreme precipitation is 2.25mm·d-1 between 1994-2004 and 1991-1993.In addition to the south of Yongzhou and the west of Hunan,the spacing from one to five days of extreme precipitation events showed an upward trend in the most areas,the Dongting Lake and the Xiangjiang River Basin increased significantly.Extreme precipitation events mainly occurred in the second and third ten days of June and the first and second ten days of May.Since 1990s,extreme precipitation events frequently occurred in the second ten days of July.
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