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Volume 17, issue 3 | Copyright

Special issue: Regional transport and transformation of air pollution in...

Atmos. Chem. Phys., 17, 2035-2051, 2017
https://doi.org/10.5194/acp-17-2035-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 10 Feb 2017

Research article | 10 Feb 2017

Contributions of trans-boundary transport to summertime air quality in Beijing, China

Jiarui Wu1,3, Guohui Li1, Junji Cao1, Naifang Bei2, Yichen Wang1, Tian Feng1,2, Rujin Huang1, Suixin Liu1, Qiang Zhang4, and Xuexi Tie1 Jiarui Wu et al.
  • 1Key Lab of Aerosol Chemistry and Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China
  • 2School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China
  • 3University of Chinese Academy of Science, Beijing, China
  • 4Department of Environmental Sciences and Engineering, Tsinghua University, Beijing, China

Abstract. In the present study, the WRF-CHEM model is used to evaluate the contributions of trans-boundary transport to the air quality in Beijing during a persistent air pollution episode from 5 to 14 July 2015 in Beijing–Tianjin–Hebei (BTH), China. Generally, the predicted temporal variations and spatial distributions of PM2.5 (fine particulate matter), O3 (ozone), and NO2 are in good agreement with observations in BTH. The WRF-CHEM model also reproduces reasonably well the temporal variations of aerosol species compared to measurements in Beijing. The factor separation approach is employed to evaluate the contributions of trans-boundary transport of non-Beijing emissions to the PM2.5 and O3 levels in Beijing. On average, in the afternoon during the simulation episode, the local emissions contribute 22.4% to the O3 level in Beijing, less than 36.6% from non-Beijing emissions. The O3 concentrations in Beijing are decreased by 5.1% in the afternoon due to interactions between local and non-Beijing emissions. The non-Beijing emissions play a dominant role in the PM2.5 level in Beijing, with a contribution of 61.5%, much higher than 13.7%, from Beijing local emissions. The emission interactions between local and non-Beijing emissions enhance the PM2.5 concentrations in Beijing, with a contribution of 5.9%. Therefore, the air quality in Beijing is generally determined by the trans-boundary transport of non-Beijing emissions during summertime, showing that the cooperation with neighboring provinces to mitigate pollutant emissions is key for Beijing to improve air quality.

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