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DOI	10.5194/acp-20-14769-2020
	Measurement report: Important contributions of oxygenated compounds to emissions and chemistry of volatile organic compounds in urban air
	Wu C.; Wang C.; Wang S.; Wang W.; Yuan B.; Qi J.; Wang B.; Wang H.; Wang C.; Song W.; Wang X.; Hu W.; Lou S.; Ye C.; Peng Y.; Wang Z.; Huangfu Y.; Xie Y.; Zhu M.; Zheng J.; Wang X.; Jiang B.; Zhang Z.; Shao M.
发表日期	2020
ISSN	1680-7316
起始页码	14769
结束页码	14785
卷号	20 期号:23
英文摘要	Volatile organic compounds (VOCs) play important roles in the tropospheric atmosphere. In this study, VOCs were measured at an urban site in Guangzhou, one of the megacities in the Pearl River Delta (PRD), using a gas chromatograph mass spectrometer/flame ionization detection (GC MS/FID) and a proton transfer reaction timeof-flight mass spectrometer (PTR-ToF-MS). Diurnal profile analyses show that stronger chemical removal by OH radicals for more reactive hydrocarbons occurs during the daytime, which is used to estimate the daytime average OH radical concentration. In comparison, diurnal profiles of oxygenated volatile organic compounds (OVOCs) indicate evidence of contributions from secondary formation. Detailed source analyses of OVOCs, using a photochemical age-based parameterization method, suggest important contributions from both primary emissions and secondary formation for measured OVOCs. During the campaign, around 1700 ions were detected in PTR-ToF-MS mass spectra, among which there were 462 ions with noticeable concentrations. VOC signals from these ions are quantified based on the sensitivities of available VOC species. OVOC-related ions dominated PTR-ToF-MS mass spectra, with an average contribution of 73%9 %. Combining measurements from PTRToF-MS and GC MS/FID, OVOCs contribute 57%10% to the total concentration of VOCs. Using concurrent measurements of OH reactivity, OVOCs measured by PTR-ToFMS contribute greatly to the OH reactivity (19%10 %). In comparison, hydrocarbons account for 21%11% of OH reactivity. Adding up the contributions from inorganic gases (48%15 %), 11% (range of 0 % 19 %) of the OH reactivity remains missing", which is well within the combined uncertainties between the measured and calculated OH reactivity. Our results demonstrate the important roles of OVOCs in the emission and evolution budget of VOCs in the urban atmosphere. © 2020 BMJ Publishing Group. All rights reserved.
英文关键词	air quality; atmospheric chemistry; atmospheric pollution; concentration (composition); emission inventory; hydroxyl radical; megacity; reaction kinetics; troposphere; urban atmosphere; volatile organic compound; China; Guangdong; Guangzhou
语种	英语
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/168928
作者单位	Institute for Environmental and Climate Research, Jinan University, Guangzhou, 511443, China; Guangdong-Hong Kong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, 511443, China; State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China; State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; School of Environmental Science and Engineering, Qilu University of Technology, Jinan, 250353, China; State Environ. Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, Shanghai, 200233, China; College of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
推荐引用方式 GB/T 7714	Wu C.,Wang C.,Wang S.,et al. Measurement report: Important contributions of oxygenated compounds to emissions and chemistry of volatile organic compounds in urban air[J],2020,20(23).
APA	Wu C..,Wang C..,Wang S..,Wang W..,Yuan B..,...&Shao M..(2020).Measurement report: Important contributions of oxygenated compounds to emissions and chemistry of volatile organic compounds in urban air.Atmospheric Chemistry and Physics,20(23).
MLA	Wu C.,et al."Measurement report: Important contributions of oxygenated compounds to emissions and chemistry of volatile organic compounds in urban air".Atmospheric Chemistry and Physics 20.23(2020).