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Change Characteristics Analysis on Precipitation and Drought and Flood in Jinzhou in Recent 50 Years

YAN Zhi-yu et al(Jinzhou Meteorological Bureau,Jinzhou,Liaoning121001)  
Based on precipitation data in Jinzhou from 1960 to 2004,the characteristics of year spring and summer precipitation were analyzed with liner trend estimation and spectrum analysis methods.And statistic characteristics of drought and flood change were analyzed.The result showed that annual precipitation and summer precipitation in Jinzhou presented an upward trend,and spring precipitation presented a downward trend,there were periodical changes with 3-5 years in precipitation variation.According to the analysis of drought and flood,there was a drought every two years in Jinzhou.
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