Preprints
https://doi.org/10.5194/acp-2018-76
https://doi.org/10.5194/acp-2018-76
16 Apr 2018
 | 16 Apr 2018
Status: this preprint was under review for the journal ACP but the revision was not accepted.

Modeling tropospheric O3 evolution during the 2016 Group of Twenty summit in Hangzhou, China

Zhi-zhen Ni, Kun Luo, Yang Gao, Fei Jiang, Xiang Gao, Jian-ren Fan, and Chang-hong Chen

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.

Zhi-zhen Ni, Kun Luo, Yang Gao, Fei Jiang, Xiang Gao, Jian-ren Fan, and Chang-hong Chen
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Zhi-zhen Ni, Kun Luo, Yang Gao, Fei Jiang, Xiang Gao, Jian-ren Fan, and Chang-hong Chen
Zhi-zhen Ni, Kun Luo, Yang Gao, Fei Jiang, Xiang Gao, Jian-ren Fan, and Chang-hong Chen

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Latest update: 22 Apr 2024
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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.
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