阿克苏市日照时数的突变检测分析

运用气候突变理论对阿克苏市日照时数序列进行检测分析，结果发现近50年阿克苏市年日照时数总体呈增多趋势，但其间存在两次突变。在1980年前后年日照的突变现象显著，表现为日照时数的急剧减少，主要是由于11、12月日照时数的突然变少引起的；90年代初的突变则从80年代的气候少日照阶段转变成多日照阶段。

Detection and Analysis of the Sunshine Duration Catastrophes in Akesu City

The sunshine duration sequence in Akesu City is detected and analyzed here under the climate sudden change theory.The results show that the annual sunshine duration generally has an incre asing tendency in the last 50years.I n addition,there are two catastrophes during the time .The catastrophes of the annual sunshine duration around 1980is remarkable,and it demonstrates an extreme decrease,r esulting from the sudden decrease of the sunshine duration in November an d in December.The catastrophe,which occurs in the early 90' s,indicates a shift from the shorter sunshine duration in the 80' s to the longer sunshine duration in the 90' s.