气候变化领域集成服务门户(CCPortal): Characteristics, sources and evolution processes of atmospheric organic aerosols at a roadside site in Hong Kong

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DOI	10.1016/j.atmosenv.2021.118298
	Characteristics, sources and evolution processes of atmospheric organic aerosols at a roadside site in Hong Kong
	Yao D.; Lyu X.; Lu H.; Zeng L.; Liu T.; Chan C.K.; Guo H.
发表日期	2021
ISSN	1352-2310
卷号	252
英文摘要	A sampling campaign was conducted at an urban roadside site in Hong Kong from Nov. to Dec. in 2017 using a suite of state-of-the-art instruments to monitor compositions of non-refractory sub-micron particulate matter (NR-PM1) and gaseous pollutants. Results showed that the average NR-PM1 concentration was 26.1 ± 0.7 μg/m3 (average ± 95% confidence interval) and organic aerosol (OA) contributed the most to NR-PM1 with a proportion of 57.7 ± 0.2%. The aerosol size distributions of bulk composition of NR-PM1 presented a peak at ~600 nm with internal mixtures of the organic and inorganic components, while there were a larger proportion of primary organic particles at < 200 nm, indicating intensive emissions of primary organics at this site. Positive matrix factorization (PMF) analysis was applied to the measurement data and four OA components were identified, including a hydrocarbon-like OA (HOA) factor, a cooking organic aerosol (COA) factor and two oxygenated OA (OOA) factors of different oxidation levels: less oxidized OOA (LO-OOA) and more oxidized OOA (MO-OOA). Strikingly, the contribution of MO-OOA was the highest (30.9 ± 0.4%), suggesting high oxidation degree and/or high regional background in the roadside environment. Moreover, the proportion of COA reached 25.4 ± 0.3% at this roadside site with heavy traffic fleet, which was even higher than the percentage of HOA (p < 0.01). The average ratio of C3H3O+ / C3H5O+ (2.01 ± 0.01) and the opposite pattern of C3H3O+ / C3H5O+ to Ox during daytime hours suggested that the COA was oxidized to some extent when transported to the site. The findings implied that cooking activities are a significant source of organic aerosols in Hong Kong, even at a busy road. Control measures should focus on both cooking and traffic emissions in Hong Kong. © 2021 Elsevier Ltd
关键词	Cooking organic aerosol Organic aerosol Oxygenated organic aerosol Positive matrix factorization
语种	英语
scopus关键词	Fog; Matrix algebra; Oxidation; Particle size analysis; Roadsides; Urban growth; Characteristic evolution; Characteristic sources; Cooking organic aerosol; Evolution process; Hong-kong; Organic aerosol; Oxygenated organic aerosol; Positive Matrix Factorization; Sampling campaigns; Source process; Factorization; ammonia; carbon; chloride; hydrocarbon; hydrogen; nitrate; organic carbon; oxygen; saturated fatty acid; sulfate; unsaturated fatty acid; aerosol composition; concentration (composition); organic compound; oxidation; particle size; particulate matter; roadside environment; sampling; traffic emission; traffic management; aerosol; air pollutant; ambiguity; Article; atmosphere; atmospheric pressure; circadian rhythm; evolution; Hong Kong; humidity; meteorology; oxidation; oxygenation; particulate matter; photooxidation; pollution; priority journal; seashore; signal noise ratio; solar radiation; temperature; wind speed; winter; China; Hong Kong; Varanidae
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/248522
作者单位	Air Quality Studies, Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong; Department of Chemistry, University of Toronto, Canada; School of Energy and Environment, City University of Hong Kong, Hong Kong
推荐引用方式 GB/T 7714	Yao D.,Lyu X.,Lu H.,et al. Characteristics, sources and evolution processes of atmospheric organic aerosols at a roadside site in Hong Kong[J],2021,252.
APA	Yao D..,Lyu X..,Lu H..,Zeng L..,Liu T..,...&Guo H..(2021).Characteristics, sources and evolution processes of atmospheric organic aerosols at a roadside site in Hong Kong.ATMOSPHERIC ENVIRONMENT,252.
MLA	Yao D.,et al."Characteristics, sources and evolution processes of atmospheric organic aerosols at a roadside site in Hong Kong".ATMOSPHERIC ENVIRONMENT 252(2021).