云南近百年春季气温变化层次结构和突变特征以及低温冷害天气(Ⅰ)

以自适应多分辨分析方法和Ｍａｒ连续小波分析方法对云南近百年春季气温变化规律和低温冷害天气特征进行了分析．结果表明：云南近百年春季气温变化主要经历了５个较大时间尺度的演变，它们分别是１９１５年以前的偏冷期、１９１６～１９５８年的偏暖期、１９５９～１９８０年的相对偏冷期、１９８１～１９８７年的偏冷期和１９８８年以后的偏暖期，对应于这５个较大时间尺度的层次演变，冷暖交替的突变点分别发生在１９１６年、１９５９年、１９８１和１９８８年；在较大时间尺度上，春季低温冷害天气最容易出现在偏冷期和冷暖交替突变点附近．

The Multihierarchical Structure and the Jump Features of Temperature Changes for Yunnan during the Last One Hundred Years and Chilling Damage Weather in Spring

Using the adaptive multiresolution data filter and Marr wavelet transforms,this paper studies the multihierarchical structure and jump features of surface air temperature changes for Yunnan during the last one hudred years and chilling damage weather in spring. The results show that the temperature variations for Yunnan in spring can be described as 5 hierarchies.They are the cold period before 1915,the warm period from 1916 to 1958, the relative cold period from 1959 to 1980,the cold period from 1981 to 1987 and the warm period after 1988.The 1916,1959,1981 and 1988 are the jump points of the temperature changes.The chilling damage weather for Yunnan in spring are easily during the cold period and the jump points of the temperature changes.