气候变化领域集成服务门户(CCPortal): Observations of highly oxidized molecules and particle nucleation in the atmosphere of Beijing

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DOI	10.5194/acp-19-14933-2019
	Observations of highly oxidized molecules and particle nucleation in the atmosphere of Beijing
	Brean J.; Harrison R.M.; Shi Z.; Beddows D.C.S.; Acton W.J.F.; Nicholas Hewitt C.; Squires F.A.; Lee J.
发表日期	2019
ISSN	16807316
起始页码	14933
结束页码	14947
卷号	19 期号:23
英文摘要	Particle nucleation is one of the main sources of atmospheric particulate matter by number, with new particles having great relevance for human health and climate. Highly oxidized multifunctional organic molecules (HOMs) have been recently identified as key constituents in the growth and, sometimes, in initial formation of new particles. While there have been many studies of HOMs in atmospheric chambers, flow tubes, and clean environments, analyses of data from polluted environments are scarce. Here, measurements of HOMs and particle size distributions down to small molecular clusters are presented alongside volatile organic compounds (VOCs) and trace-gas data from a campaign in June 2017, in Beijing. Many gas-phase HOMs have been characterized and their temporal trends and behaviours analysed in the context of new particle formation. The HOMs identified have a degree of oxidation comparable to that seen in other, cleaner, environments, likely due to an interplay between the higher temperatures facilitating rapid hydrogen abstractions and the higher concentrations of NOx and other RO2· terminators ending the autoxidation sequence more rapidly. Our data indicate that alkylbenzenes, monoterpenes, and isoprene are important precursor VOCs for HOMs in Beijing. Many of the C5 and C10 compounds derived from isoprene and monoterpenes have a slightly greater degree of average oxidation state of carbon compared to those from other precursors. Most HOMs except for large dimers have daytime peak concentrations, indicating the importance of OH· chemistry in the formation of HOMs, as O3 tends to be lower on days with higher HOM concentrations; similarly, VOC concentrations are lower on the days with higher HOM concentrations. The daytime peaks of HOMs coincide with the growth of freshly formed new particles, and their initial formation coincides with the peak in sulfuric acid vapours, suggesting that the nucleation process is sulfuric-acid-dependent, with HOMs contributing to subsequent particle growth. © 2019 BMJ Publishing Group. All rights reserved.
语种	英语
scopus关键词	concentration (composition); nucleation; oxidation; particle size; particulate matter; size distribution; sulfuric acid; trace gas; volatile organic compound; Beijing [China]; China
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/143988
作者单位	Division of Environmental Health and Risk Management, School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom; Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, United Kingdom; National Centre for Atmospheric Science, Wolfson Atmospheric Chemistry Laboratories, University of York, York, YO10 5DD, United Kingdom; Department of Environmental Sciences/Center of Excellence in Environmental Studies, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia
推荐引用方式 GB/T 7714	Brean J.,Harrison R.M.,Shi Z.,et al. Observations of highly oxidized molecules and particle nucleation in the atmosphere of Beijing[J],2019,19(23).
APA	Brean J..,Harrison R.M..,Shi Z..,Beddows D.C.S..,Acton W.J.F..,...&Lee J..(2019).Observations of highly oxidized molecules and particle nucleation in the atmosphere of Beijing.Atmospheric Chemistry and Physics,19(23).
MLA	Brean J.,et al."Observations of highly oxidized molecules and particle nucleation in the atmosphere of Beijing".Atmospheric Chemistry and Physics 19.23(2019).