Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 5.509 IF 5.509
  • IF 5-year value: 5.689 IF 5-year 5.689
  • CiteScore value: 5.44 CiteScore 5.44
  • SNIP value: 1.519 SNIP 1.519
  • SJR value: 3.032 SJR 3.032
  • IPP value: 5.37 IPP 5.37
  • h5-index value: 86 h5-index 86
  • Scimago H index value: 161 Scimago H index 161
Discussion papers | Copyright
https://doi.org/10.5194/acp-2018-364
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 16 Apr 2018

Research article | 16 Apr 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Multiday haze in the East Asia: Transport and chemical aging of hygroscopic particles

Yong Bin Lim1, Jihoon Seo1,2, Jin Young Kim1, and Barbara J. Turpin3 Yong Bin Lim et al.
  • 1Department of Environment, Health, and Welfare Research, Korea Institute of Science and Technology, Seoul, 02792, South Korea
  • 2School of Earth and Environmental Sciences, Seoul National University, Seoul, 08826, South Korea
  • 3Department of Environmental Science and Environmental Engi neering, University of North Carolina, Chapel Hill, 27599, USA

Abstract. East Asian countries (Korea and China) have been experiencing exceedingly high concentrations of particulate matter (PM) that threatens health and potentially alters climate. However, the formation of East Asian PM is poorly understood. Furthermore, during the winter high PM concentrations at Seoul, Korea often occurs via the combination of the transport of Chinese haze through the prevailing Westerlies and the local formation at Seoul, and this complicates the PM formation. A severe multiday haze event occurred at Seoul during February 24–28, 2014, and the synoptic meteorological conditions suggest the combination the transport and the local formation (Seo et al., 2017). PM at Seoul and Deokjeok Island during this haze period was sampled and analyzed. Deokjeok Island provides background for Seoul PM since it is upwind and emission free. We hypothesize that transported PM from China (PM at Deokjeok Island) is hygroscopic (thus contains water due to high RH) and undergoes multiphase photochemical aging at Seoul. To validate our hypothesis, we conducted smog chamber experiments. In a humid smog chamber, photochemistry of NOx initiates hygroscopic growth of particles and aerosol liquid water in turn facilitates aqueous chemistry forming organonitrates and oligomers. This multiphase chemistry provides chemical insights of chemical aging during a haze event in East Asia. NOx effects on photochemical aging of particles are substantial. Even a few ppb of NOx form nitrates in aerosol liquid water, and acidify neutral particles. NOx reduction is not likely to be an effective strategy for nitrate- and acidity-related health.

Download & links
Yong Bin Lim et al.
Interactive discussion
Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Login for Authors/Co-Editors] [Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement
Yong Bin Lim et al.
Yong Bin Lim et al.
Viewed
Total article views: 401 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
286 107 8 401 22 9 13
  • HTML: 286
  • PDF: 107
  • XML: 8
  • Total: 401
  • Supplement: 22
  • BibTeX: 9
  • EndNote: 13
Views and downloads (calculated since 16 Apr 2018)
Cumulative views and downloads (calculated since 16 Apr 2018)
Viewed (geographical distribution)
Total article views: 401 (including HTML, PDF, and XML) Thereof 399 with geography defined and 2 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Cited
Saved
No saved metrics found.
Discussed
No discussed metrics found.
Latest update: 17 Jul 2018
Publications Copernicus
Download
Short summary
Currently high concentration PM formation in East Asia (China and Korea) is poorly understood. Furthermore, the combination of the transport from China and the local formation complicates PM formation in Korea. Based on our field and smog chamber studies, water in particles plays an important role. Transported wet particles take up HNO3 at Seoul characterized by high NOx/RH and photochemistry. Accumulated nitrates take up water and facilitate aqueous chemistry leading to secondary formation.
Currently high concentration PM formation in East Asia (China and Korea) is poorly understood....
Citation
Share