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Discussion papers | Copyright
© Author(s) 2018. This work is distributed under
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Research article 11 Apr 2018

Research article | 11 Apr 2018

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

Long-range Transport Impacts on Surface Aerosol Concentrations and the Contributions to Haze Events in China: an HTAP2 Multi-Model Study

Xinyi Dong1, Joshua S. Fu1, Qingzhao Zhu1, Jian Sun1, Jiani Tan1, Terry Keating2, Takashi Sekiya3, Kengo Sudo3, Louisa Emmons4, Simone Tilmes4, Jan Eiof Jonson5, Michael Schulz5, Huisheng Bian6, Mian Chin7, Yanko Davila8, Daven Henze8, Toshihiko Takemura9, Anna Maria Katarina Benedictow5, and Kan Huang1,10 Xinyi Dong et al.
  • 1Department of Civil and Environmental Engineering, The University of Tennessee, Knoxville, Tennessee, USA
  • 2Environmental Protection Agency, Applied Science and Education Division, National Center for 10 Environmental Research, Office of Research and Development, Headquarters, Federal Triangle, Washington, DC 20460, USA
  • 3Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan
  • 4Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado, USA
  • 5Norwegian Meteorological Institute, Oslo, Norway
  • 6Goddard Earth Sciences and Technology Center, University of Maryland, Baltimore, MD, USA
  • 7Earth Sciences Division, NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 8Department of Mechanical Engineering, University of Colorado, Boulder, CO, USA
  • 9Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan
  • 10Center for Atmospheric Chemistry Study, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China

Abstract. Haze has been severely affecting the densely populated areas in China during recent years. While many of the pilot studies have been devoted to investigate the contributions from local anthropogenic emission, limited attention has been paid to the influence from long-range transport. In this study, we use simulations from 6 participating models supplied through the Task Force on Hemispheric Transport of Air Pollution Phase 2 (HTAP2) exercise to investigate the long-range transport impact of Europe and Russia/Belarussia/Ukraine on the surface air quality in East Asia, with special focus on their contributions during the haze episodes over China. The impact of 20% anthropogenic emission perturbation from the source region is extrapolated by a factor of 5 to estimate the full impact. We find that the full impacts from EUR and RBU are 0.99µg/m3 (3.1%) and 1.32µg/m3 (4.1%) respectively during haze episodes, while the annual averaged full impacts are only 0.35µgm3 (1.7%) and 0.53µg/m3 (2.6%) respectively. By estimating the aerosol response within and above the planetary boundary layer (PBL), we find that long-range transport within the PBL contributes to 22–38% of the total column density of aerosol response. Comparison with the HTAP Phase 1 (HTAP1) assessment reveals that from 2000 to 2010, the long-range transport from Europe to East Asia has decreased significantly by a factor of 2–10 for surface aerosol mass concentration due to the simultaneous emission reduction in source region and emission increase in the receptor region. By investigating the visibility response, we find that the long-range transport from the Europe and RBU region increases the number of haze events in China by 0.15% and 0.11% respectively, and the North China Plain and southeast China receives 1–3 extra haze days. This study is the first investigation into the contribution of long-range transport to haze in China with multiple model experiments.

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We have applied the HTAP phase II multi models data to investigate the long-range transport impacts on surface concentration and column density of PM from Europe and Russia/Belarussia/Ukraine to East Asia, with special focus on the long-range transport contribution during haze episodes in China. We found that long-range transport plays a more important role in elevating the background concentration of surface PM during the haze days.
We have applied the HTAP phase II multi models data to investigate the long-range transport...