气候变化领域集成服务门户(CCPortal): Hourly measurements of organic molecular markers in urban Shanghai; China: Observation of enhanced formation of secondary organic aerosol during particulate matter episodic periods

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DOI	10.1016/j.atmosenv.2020.117807
	Hourly measurements of organic molecular markers in urban Shanghai; China: Observation of enhanced formation of secondary organic aerosol during particulate matter episodic periods
	He X.; Wang Q.; Huang X.H.H.; Huang D.D.; Zhou M.; Qiao L.; Zhu S.; Ma Y.-G.; Wang H.-L.; Li L.; Huang C.; Xu W.; Worsnop D.R.; Goldstein A.H.; Yu J.Z.
发表日期	2020
ISSN	13522310
卷号	240
英文摘要	Field campaigns rarely measure individual polar organic compounds online, leaving unexplored their potential in tracking the formation dynamics of secondary organic aerosol (SOA). In a three-week-long field campaign in urban Shanghai, we deployed a commercial Thermal desorption Aerosol Gas chromatograph system (TAG) that integrates sampling, in-situ derivatization, and thermal desorption gas chromatography-mass spectrometric analysis, producing hourly measurement of polar organics including a set of biogenic and anthropogenic SOA tracers. The abundance and variations of these SOA tracers were examined in relation to five PM2.5 episodes, varying from 4 to 64 h in duration, during the field campaign from 9 November to 3 December 2018. The episodes were associated with stagnant air parcels. In comparison with the non-episodic hours, the episodic hours showed distinct chemical characteristics of a large mass increment of nitrate (an average of 4.7 fold) and secondary organic compounds (~3–6.4 fold), exceeding those of primary pollutants (1.6–1.9 fold). These results clearly indicate the significant contributions of secondary inorganic and organic production processes to forming PM2.5 episodes. The SOA concentration estimated by the set of TAG-measured SOA tracers reached an average concentration of 2.6 μg/m3, accounting for a significant portion of OA in view of that the total organic matter (OM) in PM1 measured by an Aerosol Mass Spectrometer was 7.9 μg/m3. Among them the SOA attributed to monoaromatic compounds (e.g., toluene) accounted for a noticeable portion of the total OM, implying that control strategies targeting local anthropogenic emissions would be effective in reducing the severity of episodic PM pollution. Examining the ratio of two monoterpene-derived SOA products, we found evidence of less-aged SOA in urban Shanghai, and this result was collaborated by the O/C value (0.4) of bulk OA. This work demonstrates hourly SOA tracer measurements by TAG are uniquely specific on identification of major SOA precursors for episodic events and observing the evolution of SOA. © 2020 Elsevier Ltd
英文关键词	Episodes in urban Shanghai; Online organic compound speciation; SOA formation; Thermal desorption Aerosol Gas chromatograph (TAG)
语种	英语
scopus关键词	Aerosols; Gas chromatography; Mass spectrometers; Mass spectrometry; Monoterpenes; Pollution control; Thermal desorption; Tracers; Aerosol mass spectrometers; Anthropogenic emissions; Chemical characteristic; Gas chromatograph systems; In-situ derivatization; Mass spectrometric analysis; Polar organic compounds; Secondary organic aerosols; Particles (particulate matter); antimony; arsenic acid; barium; bismuth; bromine; cadmium; chromium; cobalt; gallium; germanium; gold; indium; lead; manganese; mercury; molecular marker; molybdenum; nickel; nitrate; organic compound; palladium; phosphorus; platinum; scandium; selenium; silver; strontium; tin; vanadium; zinc; aerosol composition; anthropogenic source; aromatic hydrocarbon; biogenic material; chemical composition; molecular analysis; organic compound; particle size; particulate matter; pollution incidence; tracer; urban area; Article; biomass; China; circadian rhythm; concentration (parameter); controlled study; decarboxylation; decomposition; derivatization; desorption; liquid chromatography-mass spectrometry; measurement; particulate matter; priority journal; secondary organic aerosol; time; time series analysis; wind speed; China; Shanghai
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/144971
作者单位	Division of Environment & Sustainability, Hong Kong; Department of Chemistry, The Hong Kong University of Science & Technology, Clear Water Bay, Hong Kong; State Environmental Protection Key Laboratory of the Formation and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, Shanghai, China; Institute of Environmental Pollution and Health, Shanghai University, Shanghai, 200072, China; Aerodyne Research Inc., Billerica, MA, United States; Department of Environmental Science, Policy, and Management, United States; Department of Civil and Environmental Engineering, University of California, Berkeley, CA, United States
推荐引用方式 GB/T 7714	He X.,Wang Q.,Huang X.H.H.,et al. Hourly measurements of organic molecular markers in urban Shanghai; China: Observation of enhanced formation of secondary organic aerosol during particulate matter episodic periods[J],2020,240.
APA	He X..,Wang Q..,Huang X.H.H..,Huang D.D..,Zhou M..,...&Yu J.Z..(2020).Hourly measurements of organic molecular markers in urban Shanghai; China: Observation of enhanced formation of secondary organic aerosol during particulate matter episodic periods.Atmospheric Environment,240.
MLA	He X.,et al."Hourly measurements of organic molecular markers in urban Shanghai; China: Observation of enhanced formation of secondary organic aerosol during particulate matter episodic periods".Atmospheric Environment 240(2020).