乌鲁木齐市晴天太阳辐射变化特征

利用乌鲁木齐市1976年以来晴天条件下的太阳总辐射实际值与理论值之差,分析太阳总辐射的变化和主要影响因子。分析得出:冬季太阳总辐射减少量最多,夏季最少,且各月减少量的变化与采暖期煤烟型污染物的释放有很好的对应关系。4—9月减少量约10%,3月和10月为15%左右,2月和11月为25%左右,1月和12月达到高峰为35%左右;采暖期晴天太阳总辐射30%的减少量中有20%是由煤烟型污染物影响造成的,10%是由常年不变的污染源和大气共同作用造成的;年太阳总辐射减少量与冬半年(采暖期)太阳总辐射减少量的变化趋势和波动是完全一致的,1976年至1998年是上升的趋势,1998年后是下降的趋势;该市近几年煤烟型污染物变化趋势与太阳辐射减少量的变化趋势基本一致。

Variation of Total Solar Radiation at the Clear Day in Urumqi

The difference about measurement and theoretic value of total solar radiation for 30 years at the clear day in Urumqi has been used to investigate the variation on total solar radiation and its affect factors.The result showed: the maximum decrease of total solar radiation appeared in winter and the minimum decrease in summer,which well-matched with the emission of soot pollution in heating period.The decrease of solar radiation in different months has been as follows: 10%(April-September),15%(March and October),25%(February and November),35%(January and December).Among the 30% decrease in the heating period,the two thirds was caused by coal-combusted air pollution and the one third decrease was caused by perennial pollutant and atmosphere.There are same trend and fluctuation between the decrease of total solar radiation in a year and that in cold half year(heating period) with the ascending trend from 1976 to 1998 and descendent one since 1998.The variation trend of coal-combusted pollutant fit well with the decrease trend of total solar radiation,so the decrease of total solar radiation can reflected the status of local coal-combusted air pollution.