塔里木盆地沙尘天气的季节变化及成因分析

 选取了塔里木盆地周边16个站点,详细分析了沙尘天气的季节变化特征。结果表明：各站点沙尘天气频率虽均以春季最高,但其他3个季节沙尘日数的分布可以分为3种类型：第一种以秋季最高,夏季次之,冬季最低,如喀什和库车地区;第二种以夏季最高,冬季次之,秋季最低,如若羌地区;第三种以夏季最高,秋季次之,冬季最低,这一种类型是塔里木盆地沙尘天气季节分布的主要特征。沙尘天气的季节变化主要受风速和沙源季节变化的影响。当沙尘来源相似时,风速是控制沙尘释放强度的主要因素。

Seasonal Distribution and Causes of Dust Events in Tarim Basin, China

Dust event occurrence and its seasonal distributions in 16 sites are analyzed in Tarim Basin, China. The results show that although dust event frequency are the highest in spring in this region,its seasonal variations can be classified into 3 kinds of distributions:①frequency of dust event in autumn>that in summer>that in winter, in which Kashi and Kuche may be the representative sites; ②frequency in summer>that in winter>that in autumn, in which Ruoqiang is the typical site; and ③that in summer>that in autumn>that in winter, which include the most areas of Tarim Basin. Although dust emissions and its seasonal variations in Tarim Basin are mainly controlled by wind and dust sources, the former is the key control on dust occurrence in this region especially their sources have no significant changes.