ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Characteristics of Climatic Changes and Catastrophe of Extreme Precipitation in Hunan in Recent 40 Years
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Abstract:
According to the data of daily precipitation in Hunan from 1961 to 200 4, the climatic changes and the catastrophe of extreme precipitation events are analysed. The results show that the amount and days of extreme precipitation ha s significantly increased in the recent 44 years. 1993 is the mutational site o f significant increase. Between 1994-2004 and 1991-1993 the difference of extrem e 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 mutat ion but there is an upward trend after 1993. The increase of the intensity of e xtreme 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 upw ard trend in the most areas, the Dongting Lake and the Xiangjiang River Basin in creased significantly. Extreme precipitation events mainly occurred in the secon d and third ten days of June and the first and second ten days of May. Since 199 0s, extreme precipitation events frequently occurred in the second ten days of July.
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