http://en.cnki.com.cn/Article_en/CJFDTotal-YYQX2002S1020.htm
CHARACTERISTICS OF AEROSOLS UNDER DUST AND SAND WEATHER IN BEIJING

Yang Dongzhen, Yan Peng, Xu Xiangde  Chinese Academy of Meteorological Sciences, Beijing 100081

The characteristics of sand and dust weather in Beijing are studied. The distribution of sand and dust weather, the air pollution produced
during the sand and dust weather period, the main causes of sand and dust weather,and the sources of sand and dust are investigated
through analyzing synoptic climate data, satellite images,air mass trajectories and physical and chemical characteristics of air aerosols.

The preliminary conclusions are that the sand and dust weather occurs more frequently in the spring months than other season in Beijing,
 which is one of the important causes of the air pollution in Beijing.The spring sand and dust weather in Beijing are mainly caused by
sandstorms, suspended dust and blowing sand.   The proportion resulting from blowing sand is measured up to 71.4%.

The physical and chemical characteristics of the air aerosols in the sand and dust weather are obviously different from normal days.
The physical and chemical characteristics of the air aerosols demonstrate thatduring the sand and dust weather the air aerosols
mainly come from the local natural source. The role of anthropogenic emission relatively becomes less important.
【Key Words】： Sand and dust weather Sandstorm Blowing sand Suspended dust Aerosol Dust source. 
【Fund】： 《国家重点基础研究发展规划》项目 :首都北京及周边地区大气、水、土环境污染机理与调控原理(项目编号 :G1 9990 4 5 70 0 )的资助 
【CateGory Index】： X513
【DOI】： cnki:ISSN:1001-7313.0.2002-S1-020

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http://zhidao.baidu.com/question/35821535.html
北京沙尘暴的原因

The cause of  sandstorm in Beijing Since Yuan Dynasty，Beijing Have Had Records of sandstorm which mainly Happens in spring.
So far, there is no evidence that if Beijing sandstorm is strengthening or weakening.

 Sand and dust of Beijing sandstorm stems from both inner and outside Beijing region. Outside cause of Beijing sandstorm is global climatic change ,

inner cause is overweight of population pressure and non-harmonious population-land relations.

To prevent Beijing sandstorm, China should take vigorous action to look for international co-operation so as to reduce discharge of hothouse gas

and accept international aid, to issue a series of  relative policies, also Beijing should work out concrete active plans.

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http://us.tom.com/english/257.htm
这个网页的资料可以作为补充参考。

REFERENCES:

• MICROSCOPIC STUDY of LEAD IODIDE-
• NUCLEATED ICE CRYSTALS

• ROGER J. CHENG, ASRC SUNY UALBANY

PHOTO by: ROGER J. CHENG-BEIJING-1982

http://rogerjcheng.com/ENVIRONMENT-BUILDING%20EROSION.htm