Revealing the modulation of boundary conditions and governing processes on ozone formation over northern China in June 2017.

Environmental Pollution
Feifan YanHuiwang Gao

Abstract

In this study, ozonesonde data were used to evaluate the impact of different boundary conditions on the vertical distribution of ozone over urban Beijing. The comparison shows that the clean and static boundary conditions, referred to as PROFILE, apparently underestimate the ozone concentration over the upper troposphere and stratosphere, whereas the global chemical transport model (CTM) provides much more reasonable performance. Further investigation reveals that the boundary conditions exert larger impacts over areas with high altitudes and close distances to boundaries, such as the Tibetan Plateau, while they yield weak impacts on regions relatively far from the boundary, such as the North China Plain (NCP). Process analysis was conducted to investigate the modulation of physical and chemical processes on ozone formation in June 2017, illustrating that during the daytime of the high-O3 period, the photochemical reactions within the planetary boundary layer (PBL) almost become the only source favorable to ozone accumulation. Motivated by this phenomenon, we constructed a linear regression and found that the maximum daily 8-hr ozone (MDA8) ozone concentration was highly correlated with the surface ozone change rate and chemica...Continue Reading

References

Oct 2, 2012·Journal of the Air & Waste Management Association·Joshua S FuYun Fat Lam
Sep 4, 2013·Risk Analysis : an Official Publication of the Society for Risk Analysis·Ying ZhouJonathan I Levy
Aug 24, 2016·Proceedings of the National Academy of Sciences of the United States of America·Yuzhong Zhang, Yuhang Wang
Sep 30, 2017·Environmental Pollution·Xiaoyang ChenShaojia Fan
Jan 1, 2017·Atmospheric Chemistry and Physics·Benjamin N MurphyHavala O T Pye

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Citations

Nov 24, 2021·The Science of the Total Environment·Yang GaoHuiwang Gao

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