气候变化领域集成服务门户(CCPortal): Insight into the formation and evolution of secondary organic aerosol in the megacity of Beijing, China

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DOI	10.1016/j.atmosenv.2019.117070
	Insight into the formation and evolution of secondary organic aerosol in the megacity of Beijing, China
	Li J.; Liu Z.; Gao W.; Tang G.; Hu B.; Ma Z.; Wang Y.
发表日期	2020
ISSN	1352-2310
卷号	220
英文摘要	Organic components are the most abundant fraction of atmospheric submicron particles, but the chemical characteristics of organic aerosols (OA) remain not fully understood. Here, the formation and evolution of secondary organic aerosol (SOA) was evaluated using an Aerodyne high-resolution time-of-flight aerosol mass spectrometer at an urban site in Beijing from 1 to 30 September 2015. The submicron aerosol particles were dominated by organics (accounting for an average of 43.2% of the total mass), followed by nitrate (19.8%), sulfate (19.2%), ammonium (10.2%), black carbon (BC) (8.5%) and chloride (1.4%). Positive matrix factorization of high-resolution organic aerosol mass spectra identified two oxygenated organic aerosol (OOA) components: a less oxidized OOA (LO-OOA) and a more oxidized OOA (MO-OOA). The mass concentrations of MO-OOA and LO-OOA correlated well with the odd oxygen (Ox = O3+nitrogen dioxide (NO2)), with slopes of 1.15 μg m−3 per 10 ppb Ox and 0.48 μg m−3 per 10 ppb Ox, respectively, suggesting the important role of photochemical processing in OOA production. In addition, aqueous-phase processing was also observed to contribute substantially to MO-OOA production when RH > 60%, and RH suppressed LO-OOA formation. Further episode analysis showed that the gas-phase reaction was the main driving force for organic oxidation during the initial pollution stage, during which LO-OOA gradually transformed to MO-OOA as indicated by an increase in the most oxidized ion (CO2+) and a decrease in a moderately oxidized ion (C2H3O+). Compared with the initial pollution stage, gas-phase oxidation was largely enhanced during the daytime in the peak pollution stage which showed a stronger dependence of MO-OOA on Ox concentration. In addition, enhanced aqueous-phase oxidation and the partitioning process both contributed to the incorporation of oxygenated species into the particle phase during the nighttime in the presence of high aerosol water content. © 2019
关键词	Aqueous-phase processes Formation and evolution Photochemistry Secondary aerosol particles
语种	英语
scopus关键词	Aerosols; Chlorine compounds; Factorization; Gases; Mass spectrometers; Mass spectrometry; Nitrogen oxides; Particulate emissions; Phase interfaces; Photochemical reactions; Pollution; Sulfur compounds; Urban growth; Aqueous phase; Aqueous phase oxidations; Aqueous-phase processing; Formation and evolutions; Photochemical processing; Positive Matrix Factorization; Secondary aerosols; Secondary organic aerosols; Oxidation; ammonia; ammonium nitrate; ammonium sulfate; black carbon; chloride; nitrate; oxygen; sulfate; aerosol; aerosol composition; air quality; ammonium; aqueous solution; atmospheric pollution; black carbon; chloride; megacity; organic compound; photochemistry; sulfate; urban atmosphere; urban site; air pollution; aqueous solution; Article; chemical composition; chemical reaction; China; clinical evaluation; combustion; concentration process; gas; molecular evolution; oxidation kinetics; oxygenated organic aerosol; oxygenation; particle size; photochemistry; priority journal; secondary organic aerosol; time of flight mass spectrometry; water content; Beijing [China]; China
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/249509
作者单位	State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; Beijing Shangdianzi Regional Atmosphere Watch Station, Beijing, 100089, China
推荐引用方式 GB/T 7714	Li J.,Liu Z.,Gao W.,et al. Insight into the formation and evolution of secondary organic aerosol in the megacity of Beijing, China[J],2020,220.
APA	Li J..,Liu Z..,Gao W..,Tang G..,Hu B..,...&Wang Y..(2020).Insight into the formation and evolution of secondary organic aerosol in the megacity of Beijing, China.ATMOSPHERIC ENVIRONMENT,220.
MLA	Li J.,et al."Insight into the formation and evolution of secondary organic aerosol in the megacity of Beijing, China".ATMOSPHERIC ENVIRONMENT 220(2020).