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DOI	10.5194/acp-20-10831-2020
	What have we missed when studying the impact of aerosols on surface ozone via changing photolysis rates?
	Gao J.; Li Y.; Zhu B.; Hu B.; Wang L.; Bao F.
发表日期	2020
ISSN	1680-7316
起始页码	10831
结束页码	10844
卷号	20 期号:18
英文摘要	Previous studies have emphasized that the decrease in photolysis rate at the surface induced by the light extinction of aerosols could weaken ozone photochemistry and then reduce surface ozone. However, quantitative studies have shown that weakened photochemistry leads to a much greater reduction in the net chemical production of ozone, which does not match the reduction in surface ozone. This suggests that in addition to photochemistry, some other physical processes related to the variation of ozone should also be considered. In this study, the Weather Research and Forecasting with Chemistry (WRF-Chem) model coupled with the ozone source apportionment method was applied to determine the mechanism of ozone reduction induced by aerosols over central East China (CEC). Our results showed that weakened ozone photochemistry led to a significant reduction in ozone net chemical production, which occurred not only at the surface but also within the lowest several hundred meters in the planetary boundary layer (PBL). Meanwhile, a larger ozone gradient was formed in the vertical direction, which led to the high concentrations of ozone aloft being entrained by turbulence from the top of the PBL to the surface and partly counteracting the reduction in surface ozone. In addition, contribution from dry deposition was weakened due to the decrease in surface ozone concentration. The reduction in the ozone's sink also slowed down the rate of the decrease in surface ozone. Ozone in the upper layer of the PBL was also reduced, which was induced by much ozone aloft being entrained downward. Therefore, by affecting the photolysis rate, the impact of aerosols was a reduction in ozone not only at the surface but also throughout the entire PBL during the daytime over CEC in this study. The ozone source apportionment results showed that 41.4%-66.3% of the reduction in surface ozone came from local and adjacent source regions, which suggested that the impact of aerosols on ozone from local and adjacent regions was more significant than that from long-distance regions. The results also suggested that while controlling the concentration of aerosols, simultaneously controlling ozone precursors from local and adjacent source regions is an effective way to suppress the increase in surface ozone over CEC at present. © 2020 Author(s).
语种	英语
scopus关键词	aerosol; boundary layer; concentration (composition); ozone; photochemistry; photolysis; source apportionment; turbulence; weather forecasting; China
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247520
作者单位	Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, China; School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China; Key Laboratory of Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing, China; State Key Laboratory of Atmosphere Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Gao J.,Li Y.,Zhu B.,et al. What have we missed when studying the impact of aerosols on surface ozone via changing photolysis rates?[J],2020,20(18).
APA	Gao J.,Li Y.,Zhu B.,Hu B.,Wang L.,&Bao F..(2020).What have we missed when studying the impact of aerosols on surface ozone via changing photolysis rates?.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(18).
MLA	Gao J.,et al."What have we missed when studying the impact of aerosols on surface ozone via changing photolysis rates?".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.18(2020).