Modeling tropospheric O3 evolution during the 2016 Group of Twenty summit in Hangzhou, China
- 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
- 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.
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Zhi-zhen Ni et al.


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RC1: 'Comments for manuscript “Modeling tropospheric O3 evolution during the 2016 Group of Twenty summit in Hangzhou, China”', Anonymous Referee #1, 15 May 2018
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AC1: 'Response to reviewer 1', Kun Luo, 14 Sep 2018
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AC1: 'Response to reviewer 1', Kun Luo, 14 Sep 2018
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RC2: 'Review of "Modeling tropospheric O3 evolution during the 2016 Group of Twenty summit in Hangzhou, China"', Anonymous Referee #2, 04 Aug 2018
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AC2: 'Response to reviewer 2', Kun Luo, 14 Sep 2018
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AC2: 'Response to reviewer 2', Kun Luo, 14 Sep 2018


-
RC1: 'Comments for manuscript “Modeling tropospheric O3 evolution during the 2016 Group of Twenty summit in Hangzhou, China”', Anonymous Referee #1, 15 May 2018
-
AC1: 'Response to reviewer 1', Kun Luo, 14 Sep 2018
-
AC1: 'Response to reviewer 1', Kun Luo, 14 Sep 2018
-
RC2: 'Review of "Modeling tropospheric O3 evolution during the 2016 Group of Twenty summit in Hangzhou, China"', Anonymous Referee #2, 04 Aug 2018
-
AC2: 'Response to reviewer 2', Kun Luo, 14 Sep 2018
-
AC2: 'Response to reviewer 2', Kun Luo, 14 Sep 2018
Zhi-zhen Ni et al.
Zhi-zhen Ni et al.
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