近50年成都市日照时数变化规律  

Variation Characteristics of Sunshine Duration in Chengdu in Recent 50 Years

作　　者：陈碧辉[1] 张平[1] 郝克俊[2] 罗磊[1] 

机构地区：[1]中国气象局成都高原气象研究所,成都610071 [2]四川省人工影响天气办公室,成都610071

出　　处：《气象科技》2008年第6期760-763,共4页Meteorological Science and Technology

基　　金：中国气象局成都高原气象研究所基本科研业务费(BROP200808);成都高原气象开放实验室基金(LPM2008003);副研培养经费;大气成分数值预报业务系统建设项目资助

摘　　要：对近50年成都日照时数的年、季和月变化特征及其与云量的关系进行了分析,并用气候突变理论对日照时数进行检测分析。结果表明:近50年成都市年日照时数总体呈减少趋势,其气候变化率为每10年减少69.41 h,日照时数年际变化幅度较大,峰值点(1963年)与谷点(1989年)相差可达662.8 h。日照时数存在明显的季节差异,各季季日照时数年际变化减少的趋势从大到小依次为:夏季>冬季>春季>秋季;相应的气候变化率分别为每10年-29.77、-20.17、-9.91-、9.56 h。各月的日照时数均呈减少趋势,其中8月减少的趋势较为显著,4月减少的趋势较弱。日照时数与日照百分率的年际变化基本保持一致。年日照时数在1978年附近发生突变,表现为日照的急剧减少,从气候多日照时段转变成少日照时段。An analysis is made of the annual, seasonal, and monthly variation characteristics of sunshine duration in recent 50 years and its relationship with total cloudiness, trying to detect the variation of sunshine duration in Chengdu by the abrupt climate change theory. The results indicate that in recent 50 years, the sunshine duration decreased with a tendency of 69.41 hours per ten years; the interannual variation amplitude was obviously greater; and the difference between the sunshine durations in 1963 and in 1989 is up to 662.8 hours. There is obvious seasonal difference in sunshine duration, with bigger decreasing amplitude in summer and winter than those in spring and autumn and a tendency of --29.77 and --20.17, --9.91 and --9.56 hours per ten years, respectively. The decreasing tendency is obviously greater in August and less in April. The annual variation of sunshine duration is consistent with sunshine percentage. The sudden change occurred around 1978, with the annual sunshine duration decreased rapidly.

关 键 词：日照时数 突变 趋势 

分 类 号：P423.3[天文地球—大气科学及气象学] S162.53[农业科学—农业气象学]