摘要
文章讨论了１９９０年４月发生的两次沙尘暴天气过程的特征及其产生的原因。通过分析沙尘暴的轨迹和在榆林、延安、太原、呼和浩特和北京等地采集的沙尘气溶胶样品的一些物理化学特征，追溯了沙尘的源地。得出沙尘气溶胶的ＴＳＰ浓度在沙尘暴期间比无沙尘暴时要高数倍至一个量级左右。沙尘气溶胶中以地壳元素为主，主要存在于大粒子（ｄ＞２．１μｍ）中。一些人为排放污染元素主要分布在小粒子（ｄ＜２．１μｍ）中，在沙尘暴期间富集程度大大下降。沙尘气溶胶中的元素主要来自于自然源。
Two cases of sandstorm processes,which occurred in April 1990,were studied.Thecharacteristics of this kind of weather and the reason causing the events areinvestigated.Through analyzing the samples collected in Yulin,Yan,an,Taiyuan,Hohhotand Beijing,and calculating the sandstorm trajectories, some chemical and physicalfeatures are revealed and the source areas are found. In the periods of sandstorm activitythe total suspended particulates(TSP)concentrations are higher than normal by severaltimes upto about one order of magnitude. The aerosols of sandstorm consist of mainlythe natural lithosphere elements from the earth crust, which distribute in large particles(d>2. 1μm).The polluted elements from human activity exist in small particles(d<2. 1μm),and their enrichment factors are sharply reduced during the sandstorm.
出处
《应用气象学报》
CSCD
北大核心
1995年第1期18-26,共9页
Journal of Applied Meteorological Science
基金
<沙尘暴测量研究>项目
关键词
气溶胶
富集因子
风沙流
春季
Sandstorm
Aerosol
Trajectory
Enrichment factor.
