本文利用"黑河试验"期间张掖站1990年11月至1991年10月大气浑浊度的观测资料,分析了该地区大气浑浊度的特点,初步揭示了春季大气浑浊度增大的原因。结果表明:(1)张掖地区大气浑浊度系数β具有明显的季节变化:春季最大,夏,秋季其次,冬季最小;(2)由于大风扬沙的作用,造成春季大气浑浊度明显增大。最后还对春季一次沙(尘)暴过程的载尘量进行了估算。

In this paper,the characteristics of atmospheric turbrdity have been analysed,and the reason that atmospheric turbidity increase in Spring has been revealed preliminarily by using the observational data of atmospheric turbidity from November 1990 to October 1991 at Zhangye station.The results are as follows:(1) There is a obvious seasonal variation for the atmospheric turbidity coefficient β.The largest value is in Spring,next is in Summer or Autumn,and the smallest is in Winter.(2) Fly ash by strong wind cause the β to increase rapidly in Spring.Finally,the dust content which is in the process of a dust devil is calculated.