1960-2005年京津冀地区地表太阳辐射变化及成因分析

Analyses on Variation and Cause of Surface Solar Radiation in Beijing,Tianjin and Hebei Regions from 1960 to 2005

利用1960—2005年京津冀地区的地面太阳辐射资料,综合分析了该地区45年太阳辐射的分布状况和变化趋势,并结合云量、降水量、气溶胶光学厚度和大气含水量,分析了该地区太阳辐射的变化原因。结果表明:(1)京津冀地区的太阳辐射并没有出现20世纪80年代末到90年代中期的"变亮"现象;同期冬、春季总辐射下降,夏、秋季上升;(2)在1985—1997年间,依据总辐射变化情况,京津冀地区被分为截然相反的两个区域:东部地区总辐射增加,倾向率为1.016 MJ.m-2.mon-1.(10a)-1;西部地区总辐射减少,倾向率为10.092MJ.m-2.mon-1.(10a)-1;(3)总辐射增加的区域,主要是由于云量减少、降水量减少所伴随的日照时数增加以及气溶胶光学厚度降低所造成的;(4)总辐射减少的区域,云量、气溶胶光学厚度和降水量变化并不显著,总辐射持续减少。

The temporal and spatial variations of global radiation in Beijing,Tianjin and Hebei regions from 1960 to 2005 are analyzed.The results shows that the phenomenon ＇from dimming to brightening＇ is not observed in this area,while the global radiation decreases during spring and winter but increased during summer and autumn.However,two different regions could be distinguished based on the variation of global radiation： The increase of trend coefficient in eastern region is 1.016 MJ·m-2·mon-1·（10 a）-1 and their decrease in western region is 10.092 MJ·m-2·mon-1·（10 a）-1.It is also found that the increase of global radiation is caused by two primary factors： One is the increase of which follow with the decrease of cloud amount and precipitation and the other is the decrease of aerosol optical depth.Besides,the major cause of the decreased radiation in western area is the little change of cloud amount,precipitation,aerosol optical depth and sunshine duration.