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《Journal of Anhui Agricultural Sciences》 2010-34
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Analysis on the Variation Characteristics of Precipitation in North China during Recent 30 Years

HAN Jun-cai et al(Key Laboratory of Meteorological Disaster,Ministry of Education,Nanjing University of Information Science & Technology,Nanjing,Jiangsu 210044)  
Based on the monthly precipitation data from 43 stations in North China from 1979 to 2008,the variation characteristics of precipitation in North China in recent 30 years were analyzed by means of EOF decomposition,Morlet wavelet transform and Mann-Kendall test.The results showed that the spatial distribution of annual and seasonal precipitation was basically identical in North China,while the annual and summer precipitation from the middle of 1980s to 1990s was obviously more than that in other periods,and there was great annual variation of spring rainfall in 1990s,while autumn precipitation was higher from 1980s to 1990s and then went down after the beginning of 21th century,which was opposite to winter precipitation,namely there was more winter precipitation from 1980s to 1990s and less winter precipitation after the beginning of 21th century.In addition,the annual and summer precipitation changed abruptly in 1997,and there was no obvious change in spring precipitation and autumn precipitation,while winter precipitation had an abrupt change in 2000.Meanwhile,wavelet analysis revealed the periodic evolution of annual and seasonal precipitation with the annual variation period of 3-4 years.
【Fund】: 国家科技支撑计划课题(2007BAC29B02)
【CateGory Index】: P468.024
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