Science China Earth Sciences

, Volume 57, Issue 1, pp 14–25 | Cite as

Mechanism for the formation of the January 2013 heavy haze pollution episode over central and eastern China

  • YueSi Wang
  • Li Yao
  • LiLi Wang
  • ZiRui Liu
  • DongSheng Ji
  • GuiQian Tang
  • JunKe Zhang
  • Yang Sun
  • Bo Hu
  • JinYuan Xin
Research Paper Special Topic: The Severe Fog and Haze Event over Eastern China in January 2013

Abstract

In January 2013, a long-lasting episode of severe haze occurred in central and eastern China, and it attracted attention from all sectors of society. The process and evolution of haze pollution episodes were observed by the “Forming Mechanism and Control Strategies of Haze in China” group using an intensive aerosol and trace gases campaign that simultaneously obtained data at 11 ground-based observing sites in the CARE-China network. The characteristics and formation mechanism of haze pollution episodes were discussed. Five haze pollution episodes were identified in the Beijing-Tianjin-Hebei (Jing-Jin-Ji) area; the two most severe episodes occurred during 9–15 January and 25–31 January. During these two haze pollution episodes, the maximum hourly PM2.5 mass concentrations in Beijing were 680 and 530 μg m−3, respectively. The process and evolution of haze pollution episodes in other major cities in the Jing-Jin-Ji area, such as Shijiazhuang and Tianjin were almost the same as those observed in Beijing. The external cause of the severe haze episodes was the unusual atmospheric circulation, the depression of strong cold air activities and the very unfavorable dispersion due to geographical and meteorological conditions. However, the internal cause was the quick secondary transformation of primary gaseous pollutants to secondary aerosols, which contributed to the “explosive growth” and “sustained growth” of PM2.5. Particularly, the abnormally high amount of nitric oxide (NOx) in the haze episodes, produced by fossil fuel combustion and vehicle emissions, played a direct or indirect role in the quick secondary transformation of coal-burning sulphur dioxide (SO2) to sulphate aerosols. Furthermore, gaseous pollutants were transformed into secondary aerosols through heterogeneous reactions on the surface of fine particles, which can change the particle’s size and chemical composition. Consequently, the proportion of secondary inorganic ions, such as sulphate and nitrate, gradually increased, which enhances particle hygroscopicity and thereby accelerating formation of the haze pollution.

Keywords

haze pollution episode meteorology air pollution complex cooperative transition Jing-Jin-Ji 

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Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • YueSi Wang
    • 1
  • Li Yao
    • 1
  • LiLi Wang
    • 1
  • ZiRui Liu
    • 1
  • DongSheng Ji
    • 1
  • GuiQian Tang
    • 1
  • JunKe Zhang
    • 1
  • Yang Sun
    • 1
  • Bo Hu
    • 1
  • JinYuan Xin
    • 1
  1. 1.State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina

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