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Sci Rep. 2016 May 31;6:27151. doi: 10.1038/srep27151.

Rapid formation and evolution of an extreme haze episode in Northern China during winter 2015.

Scientific reports

Yele Sun, Chen Chen, Yingjie Zhang, Weiqi Xu, Libo Zhou, Xueling Cheng, Haitao Zheng, Dongsheng Ji, Jie Li, Xiao Tang, Pingqing Fu, Zifa Wang

Affiliations

  1. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China.
  2. Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
  3. College of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China.
  4. School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China.
  5. University of Chinese Academy of Sciences, Beijing 100049, China.
  6. Key Laboratory of Environmental Optics &Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.

PMID: 27243909 PMCID: PMC4886685 DOI: 10.1038/srep27151

Abstract

We investigate the rapid formation and evolutionary mechanisms of an extremely severe and persistent haze episode that occurred in northern China during winter 2015 using comprehensive ground and vertical measurements, along with receptor and dispersion model analysis. Our results indicate that the life cycle of a severe winter haze episode typically consists of four stages: (1) rapid formation initiated by sudden changes in meteorological parameters and synchronous increases in most aerosol species, (2) persistent evolution with relatively constant variations in secondary inorganic aerosols and secondary organic aerosols, (3) further evolution associated with fog processing and significantly enhanced sulfate levels, and (4) clearing due to dry, cold north-northwesterly winds. Aerosol composition showed substantial changes during the formation and evolution of the haze episode but was generally dominated by regional secondary aerosols (53-67%). Our results demonstrate the important role of regional transport, largely from the southwest but also from the east, and of coal combustion emissions for winter haze formation in Beijing. Also, we observed an important downward mixing pathway during the severe haze in 2015 that can lead to rapid increases in certain aerosol species.

References

  1. Proc Natl Acad Sci U S A. 2013 Aug 6;110(32):12936-41 - PubMed
  2. Nature. 2014 Oct 9;514(7521):218-22 - PubMed
  3. Environ Sci Technol. 2009 Apr 1;43(7):2443-9 - PubMed
  4. Sci Rep. 2016 Feb 18;6:20668 - PubMed
  5. Proc Natl Acad Sci U S A. 2014 Dec 9;111(49):17373-8 - PubMed
  6. Mass Spectrom Rev. 2007 Mar-Apr;26(2):185-222 - PubMed
  7. J Air Waste Manag Assoc. 2002 Jun;52(6):628-713 - PubMed
  8. Science. 2006 Jan 6;311(5757):67-70 - PubMed
  9. Proc Natl Acad Sci U S A. 2015 May 26;112(21):E2739-40 - PubMed
  10. Anal Bioanal Chem. 2011 Dec;401(10):3045-67 - PubMed
  11. Sci Rep. 2016 Jan 12;6:18998 - PubMed
  12. Environ Sci Technol. 2015 Oct 6;49(19):11340-7 - PubMed
  13. Sci Rep. 2014 Feb 25;4:4172 - PubMed

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