1957~2000年沈阳地区气温和降水变化特征分析

利用1957～2000年沈阳地区逐日平均气温、降水量资料,采用线性趋势分析、Mann-Kendall突变检测法和Morlet小波变换等方法,分析了近44a来沈阳地区气温和降水变化的总体特征及趋势,并利用极端气温和降水指数探讨了其变化特征。结果表明:近44 a来沈阳地区气温呈显著的上升趋势,气温变化有较明显的突变特征,突变时间出现在1981～1982年;降水呈波动下降趋势,自20世纪80年代以来,极端降水事件的强度和频率均呈上升趋势。

Characteristics of temperature and precipitation in Shenyang area from 1957 to 2000

Based on mean daily temperature and precipitation data from 1957 to 2000 in Shenyang area,the general characteristics and trends of temperature and precipitation variations were analyzed with linear trend analysis,Mann-Kendall break detector and Morlet wavelet transform method.Furthermore,their variation characteristics were discussed with the extreme temperature index and the extreme precipitation index.The results indicated that temperature showed a significant upward trend in Shenyang area during recent 44 years.And temperature variation had obviously abrupt change.The time of abrupt change was from 1981 to 1982.Precipitation showed a fluctuant downtrend,while intensity and frequency of extreme precipitation events were increasing since 1980s.