Characteristics and sources of 2002 super dust storm in Beijing

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• 作者：Yele Sun (1)
  Guoshun Zhuang (1) (2)
  Hui Yuan (1)
  Xingying Zhang (1)
  Jinghua Guo (1)
  
• 关键词：dust storm ; aerosol ; characteristics ; sources ; global environment change
• 刊名：Chinese Science Bulletin
• 出版年：2004
• 出版时间：April 2004
• 年：2004
• 卷：49
• 期：7
• 页码：698-705
• 全文大小：769KB
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• 作者单位：Yele Sun (1)
  Guoshun Zhuang (1) (2)
  Hui Yuan (1)
  Xingying Zhang (1)
  Jinghua Guo (1)
  
  1. The Center for Atmospheric Environmental Study, Beijing Normal University, 100875, Beijing, China
  2. The Institute of Atmospheric Physics, Chinese Academy Sciences, LAPC, 100029, Beijing, China
  
• ISSN：1861-9541

文摘

On 20 March, 2002, a super dust storm attacked Beijing, which was stronger than any dust storm ever recorded. The concentration of total suspended particulates (TSP) reached 10.9 mg · m?, 54 times as high as the national air quality standard. The concentrations of major crustal elements, such as Ca, Al, Fe, Na, Mg and Ti, were 30-8 times higher than those in non-dust storm days. The concentrations of pollution elements, such as Zn, Cu, Pb, As, Cd and S, were also about several or even nearly ten times higher than those in normal days. The enrichment factors of Pb, As, Cd and S in PM2.5 were as high as 12.7, 29.6, 43.5, 28.4, indicating that these pollutants came from the mixing of mineral aerosol with pollution aerosol emitted by pollution sources on the way of dust storm’s long-range transport. The overlap of invaded air mass from dust with pollution air mass from Beijing local area was another reason for the enhancement of pollutants. During dust storm, fine particles (PM2.5) accounted for 30% of TSP and pollutants in PM2.5 accounted for even as high as 45%-9% of TSP. The increase of pollutants after dust storm proved further that mineral aerosol, especially the fine particles from dust storm favored the transformation and accumulation of pollutants. It must be noted that Fe (II) was detected again in this dust storm, which provided new evidence for the mechanism of coupling and feedback between iron and sulfur in the atmosphere and the ocean. The increase of both pollutants and nutrient, Fe(II), during dust storm illuminated that dust storm is an important factor affecting the global environment change.