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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-1187
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
08 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Widespread air pollutants of the North China Plain during the Asian summer monsoon season: A case study
Jiarui Wu1,3, Naifang Bei2, Xia Li1,3, Junji Cao1, Tian Feng1, Yichen Wang1, Xuexi Tie1, and Guohui Li1 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
Abstract. During the Asian summer monsoon season, prevailing southeasterly – southwesterly winds are subject to delivering air pollutants from the North China Plain (NCP) to the Northeast and Northwest China. In the present study, the WRF-CHEM model is used to evaluate contributions of trans-boundary transport of the NCP emissions to the air quality in the Northeast and Northwest China during a persistent air pollution episode from 22 to 28 May 2015. The WRF-CHEM model generally performs well in capturing the observed temporal variation and spatial distribution of fine particulate matters (PM2.5), ozone (O3), and NO2. The simulated temporal variation of aerosol species is also in good agreement with measurements in Beijing during the episode. Model simulations show that the NCP emissions contribute substantially to the PM2.5 level in Liaoning and Shanxi provinces, the adjacent downwind areas of the NCP, with an average of 24.2 and 13.9 μg m−3 during the episode, respectively. The PM2.5 contributions in Jilin and Shaanxi provinces are also appreciable, with an average of 9.6 and 6.5 μg m−3, respectively. The NCP emissions contribute remarkably to the O3 level in Liaoning province, with an average of 46.5 μg m−3, varying from 23.9 to 69.5 μg m−3. The O3 level in Shanxi province is also influenced considerably by the NCP emissions, with an average contribution of 35.1 μg m−3. The average O3 contributions of the NCP emissions to Jilin and Shaanxi provinces are 28.7 and 20.7 μg m−3, respectively. The effect of the NCP emissions on the air quality in Inner Mongolia is generally insignificant however. Therefore, effective mitigations of the NCP emissions not only improve the local air quality, but also are beneficial to the air quality in the Northeast and Northwest China during the Asian summer monsoon season.

Citation: Wu, J., Bei, N., Li, X., Cao, J., Feng, T., Wang, Y., Tie, X., and Li, G.: Widespread air pollutants of the North China Plain during the Asian summer monsoon season: A case study, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-1187, in review, 2018.
Jiarui Wu et al.
Jiarui Wu et al.

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