摘要
用小波理论对云南近百年气温变化与８月低温冷害天气的气候学特征进行了分析。结果表明：云南近百年来的气温变化主要经历了４个较大时间尺度的演变，它们分别是１９１９年以前的偏冷期，１９２０～１９５４年的偏暖期，１９５５～１９８６年的偏冷期及１９８７年以后的偏暖期。对应于这４个较大时间尺度的层次演变，云南的气温变化表现出了十分明显的突变特性，其冷暖交替的突变点分别发生在１９２０，１９５５和１９８７年。云南８月低温冷害天气主要出现在１９５５～１９８６年这一较大时间尺度的偏冷期中。对较小时间尺度的气温变化来说，云南８月低温冷害天气一般出现在气温相对偏低的偏冷期里。
In this paper,using multiresolving theory of wavelet analysis, the climatic characteristics of surface air temperature variations for Yunnan province during the last one hundred years and chilling damage weather in August are analysed. The results show that the surface air temperature variations for Yunnan province can be described as 4 hierarchies. They are the cold period before 1919,the warm period from 1920 to 1954,the cold period from 1955 to 1986 and the warm period after 1987. The larger timescale′s hierarchical changes for Yunnan province obviously appear features of climate jump. The 1920,1955 and 1987 are the jump points of climate change. The chilling damage weathers for Yunnan province in August are mainly during the cold period from 1955 to 1986. Corresponding to the smaller timescale′s air temperature variations,the chilling damage weathers for Yunnan province in August are generally located in the climatic hierarchy which the surface air temperature is lower. The feature of utility can appear before several months of chilling damage weather occurring in Yunnan province. The adaptive multiresolution filtering method introduced into this paper is important for many actual problems such as climate forecast and etc..
出处
《高原气象》
CSCD
北大核心
1997年第1期63-72,共10页
Plateau Meteorology
基金
云南省科委应用基础研究基金
关键词
低温
冷害天气
气温变化
Chilling damage weather Temperature change Conserved information
