南通大学学报（自然科学版）

利用重庆市34个常规气象台站的1961～2000年的日照时数、总云量、低云量资料,文章采用统计结合克立格空间插值方法,研究了重庆市日照时数变化趋势和大小以及和云量的关系.研究表明:除北部巫山东北一小块地方外,其它地区都呈明显的下降趋势.40 a间,年日照时数下降了约300多h,约占总日照时数的24%,日照时数下降主要表现在春、夏、冬三季,秋季变化不明显.其中,1971～1980年,日照时数出现突变,日照时数下降达150多h.从空间分布来看,西南部下降幅度最大,东南部次之,北部最小.无论是多年月平均日照时间还是年日照时间都与云量呈明显的负相关,日照时间的变化可能与云量有关.

Based on 40-year observational data of sunshine duration and the amount of cloud from thirty-four weather stations in Chongqing,the article studied the trend and range of the sunlight duration in Chongqing by means of Kriging and statistical methods.The results show that the duration of sunlight in all Chongqing areas have fallen obviously except the small area in the north and east of Wushan.The duration of sunlight has decreased for about 300 hours in the last 40 years,accounting for 24% of the whole.In terms of season,the downtrend of the sunlight mostly happens in spring,summer,and winter.Sharp fall in sunlight duration took place during 1971 to 1980,when the duration decreased more than 150 hours.Among Chongqing areas,the range of decrease in sunlight duration is less than the southwest but more than the north.The cloud amount and sunshine duration show significant negative correlation and the decrease of sunshine duration in the last forty years might be caused by the cloud amount.