摘要
利用长江流域260个观测站1960～2009年地面气象观测资料,分析了长江流域的日照时数变化趋势。结果表明,在长江源头的青藏高原上,日照时数明显高于长江流域的其他地区,为2 200～3 000 h/a;日照时数最低的区域在长江上游的以成都、重庆为中心的四川盆地及其周边区域,仅1 000～1 600 h/a;在长江中下游的广大区域内,日照时数高于四川盆地,低于青藏高原地区,在2 000 h/a左右。长江流域中日照区的日照时数下降趋势非常明显,减少速率为54.2 h/10a;低日照区的日照时数减少速率为38.4 h/10a;高日照区的日照时数呈先上升后下降的趋势。长江流域日照季节下降趋势从大到小依次为夏季>冬季>秋季,而春季日照下降不明显。
According to the ground meteorological observation data from 260 meteorological observation stations in Yangtze River valley from 1960 to 2009,the variation features of sunshine hours in this area were studied.As indicated by the results,the longest sunshine hours of about 2 200-3 000 h/a were found in Qinghai-Tibet Plateau,located in the source region of Yangtze River（region 3）,while the shortest of about only 1 000-1 600 h/a were found in Sichuan Basin and its surrounding areas,located in the upper reaches of Yangtze River（region 2）.In the vast area of the middle and lower reaches（region 1）,the sunshine hours were longer than that in Sichuan Basin,but shorter than that in Qinghai-Tibet Plateau,and the value was about 2 000 h/a.The sunshine hours of region 1 showed an obvious decreasing trend of 54.2 h/10a,that of region 2 decreased at a rate of 38.4 h/10a,while that of region 3 firstly increased and then declined.The sunshine hours along the Yangtze River valley also showed a seasonal declining trend of summer winter autumn without much obvious change in spring.
出处
《安徽农业科学》
CAS
2012年第23期11769-11771,共3页
Journal of Anhui Agricultural Sciences
关键词
日照时数
变化趋势
气候倾向率
长江流域
Sunshine hours：Variation characteristics：Climate tendency rate：Yangtze River valley
