利用中值检测方法研究近50年中国极端气温变化趋势

利用中国194个站点1957—2001年的逐日温度观测资料和月平均温度资料，分别采用中值和均值两种极端事件检测方法，检测并比较了中国极端高温事件和极端低温事件的变化趋势和空间分布特征.检测表明，年均极端高温的次数在近50年中趋于上升，而年均极端低温的次数有所减少，这与目前观测结果一致，符合全球变暖的特点.在空间分布上，除西南地区部分站点外，近50年中国大部分地区极端低温事件的年均发生次数趋于减少，而极端高温事件发生频率的变化则呈现出东南沿海地区减少、西北内陆地区增加的分布特点. 关键词： 极端事件 全球增暖 变化趋势 中值

Analysis of extreme events in China's temperature in recent 50 years using detectinq method based on median

Based on daily and monthly temperature records from 1957 to 2001 of China，using climate extreme detecting method based on average and median，we have analyzed the transition and distribution of frequency of temperature extremes.The results indicate that while the average number of extreme high temperature events per year has been increased in the last 50 years,the extreme low temperature events decreased.Except for some stations located in southwest China，the frequency of extreme low temperature events in most regions over China decreased.The spatial pattern of transition of frequency of extreme high temperature events showed decreased in southeast coastal regions and increase in inland regions.