近57年川东区域日照变化特征分析

Analysis on the Variation Characteristics of Sunlight in East Sichuan in Recent 57 Years

基于1954—2010年川东地区和中东部地区若干站点的日照时数和日照百分率资料,采用线性倾向估计法对川东地区日照的年和不同季节的变化特征进行趋势分析,并采用Mann-Kendall(M-K)检验法对该地区日照变化进行突变检验。结果表明,近57年来川东地区年、各季日照时数和日照百分率的变化均呈显著的减少趋势,且减少趋势主要体现在冬、夏两季,春、秋季日照时数和日照百分率减少趋势不如冬夏季明显;1980年,川东地区的日照时数、日照百分率存在显著的突变特征。

Based on the data of sunshine hours and sunshine percentage at a number of stations in East Sichuan and Central East from 1954 to 2010,linear trend estimation was used to analyze the trend of annual and seasonal climatic changes of sunlight in East Sichuan.The Mann-Kendall(M-K)test was used to test the abrupt change of sunshine in this region.The results showed that in the past 57 years,the climate change in the annual,seasonal sunshine hours and sunshine percentage in the East Sichuan region showed a significant decrease trend,and the reduction trend mainly reflected in the winter and summer,the decreasing trend of sunshine hours and sunshine percentage in spring and autumn was not as obvious as that in winter and summer.In 1980,there were significant abrupt changes in sunshine hours and sunshine percentage in East Sichuan.