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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2018-76
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
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).
Modeling tropospheric O3 evolution during the 2016 Group of Twenty summit in Hangzhou, China
Zhi-zhen Ni1, Kun Luo1, Yang Gao2, Fei Jiang3, Xiang Gao1, Jian-ren Fan1, and Chang-hong Chen4 1State Key Laboratory of Clean Energy, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China
2Key Laboratory of Marine Environment and Ecology, Ministry of Education of China, Ocean University of China, Qingdao 266100, China
3International Institute for Earth System Science, Nanjing University, Nanjing, China
4Shanghai Academy of Environmental Sciences, Shanghai 200233, China
Abstract. To elucidate the factors governing the urban O3 pollution during the campaign period of 2016 Group of Twenty (G20) summit in China, the Weather Research Forecast with Chemistry (WRF-Chem) model was used to simulate the spatial and temporal O3 evolution in the Yangtze River Delta (YRD) region from August 24 to September 06, 2016. A unique mechanism was found to modulate the high ozone episodic event. Before the tropical cyclone, a prevailing north wind component brought in emission sources which are favorable for ozone formation. With the invasion of tropical cycle, subsidence air and stagnant weather were induced. Together with local urban heat island effect, there factors intensify ozone pollution in the YRD region. Different atmospheric processes were further analyzed to investigate the control factors of ozone formation through the integrated process rate method. It was found that both the vertical diffusion and the enhancing process of local chemical generation accounted for the growth of surface O3 concentration in Hangzhou. Besides, dynamical circulations of O3 advection associated with urban heat island effect were observed during the high O3 episode (August 24–25, 2016), and low O3 episode on September 5–6, 2016 was mainly resulting from the local chemical consumption. This provides insight into urban O3 formation and dispersion in East China during the tropical cyclone events.
Citation: Ni, Z.-Z., Luo, K., Gao, Y., Jiang, F., Gao, X., Fan, J.-R., and Chen, C.-H.: Modeling tropospheric O3 evolution during the 2016 Group of Twenty summit in Hangzhou, China, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-76, in review, 2018.
Zhi-zhen Ni et al.
Zhi-zhen Ni et al.
Zhi-zhen Ni et al.

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Short summary
A unique mechanism was found to modulate the high ozone episodes in Hangzhou during G20 summit: Driven by tropical cyclone convergence, prevailing north winds brought in emission sources; with invasion of tropical cycle, subsidence air and stagnant weather was induced, as well as the urban heat island effect, intensifying the ozone enhancement. Different atmospheric processes were further analyzed to elucidate the control factors of ozone formation through integrated process rate method.
A unique mechanism was found to modulate the high ozone episodes in Hangzhou during G20 summit:...
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