globalchange  > 气候变化与战略
DOI: 10.1016/j.atmosenv.2019.117070
Insight into the formation and evolution of secondary organic aerosol in the megacity of Beijing, China
Author: Li J.; Liu Z.; Gao W.; Tang G.; Hu B.; Ma Z.; Wang Y.
Source Publication: Atmospheric Environment
ISSN: 1352-2310
Publishing Year: 2020
Volume: 220
Language: 英语
Keyword: 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
Subject Area: Aqueous-phase processes ; Formation and evolution ; Photochemistry ; Secondary aerosol particles
Abstract: 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
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被引频次[WOS]:5   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Appears in Collections:气候变化与战略

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Affiliation: 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

Recommended Citation:
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]. Atmospheric Environment,2020-01-01,220
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