气候变化领域集成服务门户(CCPortal): Daytime atmospheric oxidation capacity in four Chinese megacities during the photochemically polluted season: A case study based on box model simulation

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DOI	10.5194/acp-19-3493-2019
	Daytime atmospheric oxidation capacity in four Chinese megacities during the photochemically polluted season: A case study based on box model simulation
	Tan Z.; Lu K.; Jiang M.; Su R.; Wang H.; Lou S.; Fu Q.; Zhai C.; Tan Q.; Yue D.; Chen D.; Wang Z.; Xie S.; Zeng L.; Zhang Y.
发表日期	2019
ISSN	16807316
起始页码	3493
结束页码	3513
卷号	19 期号:6
英文摘要	Atmospheric oxidation capacity is the basis for converting freshly emitted substances into secondary products and is dominated by reactions involving hydroxyl radicals (OH) during daytime. In this study, we present in situ measurements of ROx radical (hydroxy OH, hydroperoxy HO2, and organic peroxy RO2) precursors and products; the measurements are carried out in four Chinese megacities (Beijing, Shanghai, Guangzhou, and Chongqing) during photochemically polluted seasons. The atmospheric oxidation capacity is evaluated using an observation-based model and radical chemistry precursor measurements as input. The radical budget analysis illustrates the importance of HONO and HCHO photolysis, which account for ∼ 50% of the total primary radical sources. The radical propagation is efficient due to abundant NO in urban environments. Hence, the production rate of secondary pollutants, that is, ozone (and fine-particle precursors (H2SO4, HNO3, and extremely low volatility organic compounds, ELVOCs) is rapid, resulting in secondary air pollution. The ozone budget demonstrates its high production in urban areas; also, its rapid transport to downwind areas results in rapid increase in local ozone concentrations. The O3-NOx-VOC (volatile organic compound) sensitivity tests show that ozone production is VOC-limited and that alkenes and aromatics should be mitigated first for ozone pollution control in the four studied megacities. In contrast, NOx emission control (that is, a decrease in NOx ) leads to more severe ozone pollution. With respect to fine-particle pollution, the role of the HNO3-NO3 partitioning system is investigated using a thermal dynamic model (ISORROPIA 2). Under high relative humidity (RH) and ammonia-rich conditions, nitric acid converts into nitrates. This study highlights the efficient radical chemistry that maintains the atmospheric oxidation capacity in Chinese megacities and results in secondary pollution characterized by ozone and fine particles. © Author(s) 2019.
语种	英语
scopus关键词	atmospheric chemistry; atmospheric modeling; atmospheric pollution; hydroxyl radical; megacity; oxidation; ozone; photochemistry; Beijing [Beijing (ADS)]; Beijing [China]; China; Chongqing; Guangdong; Guangzhou; Shanghai
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/144559
作者单位	State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China; Institute of Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum Jülich GmbH, Jülich, Germany; State Environmental Protection Key Laboratory of Formation and Prevention of the Urban Air Complex, Shanghai Academy of Environmental Sciences, Shanghai, 200233, China; Shanghai Environmental Monitoring Center, Shanghai, 200235, China; Ecological and Environmental Monitoring Center of Chongqing, Chongqing, 401147, China; Chengdu Academy of Environmental Sciences, Chengdu, 610072, China; State Environmental Protection Key Laboratory of Regional Air Quality Monitoring, Guangdong Environmental Monitoring Center, Guangzhou, 510308, China; Beijing Key Laboratory of Atmospheric Particulate Monitoring Technology, Beijing Municipal Environmental Monitoring Center, Beijing, 100048, China; Beijing Innovation Center for Engineering Science...
推荐引用方式 GB/T 7714	Tan Z.,Lu K.,Jiang M.,et al. Daytime atmospheric oxidation capacity in four Chinese megacities during the photochemically polluted season: A case study based on box model simulation[J],2019,19(6).
APA	Tan Z..,Lu K..,Jiang M..,Su R..,Wang H..,...&Zhang Y..(2019).Daytime atmospheric oxidation capacity in four Chinese megacities during the photochemically polluted season: A case study based on box model simulation.Atmospheric Chemistry and Physics,19(6).
MLA	Tan Z.,et al."Daytime atmospheric oxidation capacity in four Chinese megacities during the photochemically polluted season: A case study based on box model simulation".Atmospheric Chemistry and Physics 19.6(2019).