| 1990 年春季两次沙尘暴特征分析 |
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| 引用本文： | 杨东贞,王超.1990 年春季两次沙尘暴特征分析[J].应用气象学报,1995,6(1):18-26. |
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| 作者姓名： | 杨东贞 王超 |
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| 作者单位： | 1.中国气象科学研究院，国家卫星气象中心 |
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| 基金项目： | 《沙尘暴测量研究》项目 |
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| 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。
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| 关 键 词： | 沙尘暴 气溶胶 轨迹 富集因子 |
An Analysis of Two Sandstorms in Spring 1990 |
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| Yang Dongzhen,Wang Chao,Wen Yupu,Yu Xiaolan,Xiu Xiaobin.An Analysis of Two Sandstorms in Spring 1990[J].Quarterly Journal of Applied Meteorology,1995,6(1):18-26. |
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| Authors: | Yang Dongzhen Wang Chao Wen Yupu Yu Xiaolan Xiu Xiaobin |
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| Affiliation: | 1.1) (Chinese Academy of Meteorological Sciences, Beijing 100081); 2) ( National Satellite Meteorological Center, Beijing 100081) |
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| Abstract: | Two cases of sandstorm processes, which occurred in April 1990, were studied. The characteristics of this kind of weather and the reason causing the events are investigated. Through analyzing the samples in collected Yulin, Yan’an, Taiyuan, Hohhot and Beijing, and calculating the sandstorm trajectories, some chemical and physical features are revealed and the source areas are found. In the periods of sandstorm activity the total suspended particulates (TSP) concentrations are higher than normal by several times upto about one order of magnitude. The aerosols of sandstorm consist of mainly the natural lithosphere elements from earth crust, which distribute in large particles (d ＞2.1 μm). The polluted elements from human activity exist in small particles (d＜2.1μm), and their enrichment factors are sharply reduced during the sandstorm. |
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| Keywords: | Sandstorm Aerosol Trajectory Enrichment factor |
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