气候变化领域集成服务门户(CCPortal): Effects of Aerosol Water Content on the formation of secondary inorganic aerosol during a Winter Heavy PM2.5 Pollution Episode in Xi'an, China

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DOI	10.1016/j.atmosenv.2021.118304
	Effects of Aerosol Water Content on the formation of secondary inorganic aerosol during a Winter Heavy PM2.5 Pollution Episode in Xi'an, China
	Zhang T.; Shen Z.X.; Su H.; Liu S.X.; Zhou J.M.; Zhao Z.Z.; Wang Q.Y.; Prévôt A.S.H.; Cao J.J.
发表日期	2021
ISSN	1352-2310
卷号	252
英文摘要	Sulfate, nitrate and ammonium are the most abundant secondary inorganic aerosols (SIA) in atmospheric fine particle matter (PM2.5). Meteorological conditions, gas-particle transportation process, and aerosol acidity (pH) can influence SIA formation. In this study, we conducted semi-continuous measurements of water-soluble inorganic ions during a winter extreme pollution event (from January 9th to January 17th, 2015, average PM2.5 concentrations of ~250 μg m−3 and peak concentrations of ~700 μg m−3) in Xi'an to elucidate on the SIA formation mechanism. The hourly mean level of the total water-soluble ion was 137.4 μg m−3, accounting for 55.3% of PM2.5 on average. The dominant ions concentrations of SO42−, NO3− and NH4+ accounted for 15.8%, 19.0% and 13.2% of PM2.5 mass, respectively. PM2.5 was moderately acidic, with an average pH of 4.8 ± 0.4. Compared to the clean periods, sulfate content decreased by 6.9% during the polluted periods, while those of nitrate and ammonium increased by 2.2% and 5.0%, respectively. The increase in nitrogen oxidation ratios (NOR) and ammonia conversion ratio (NHR) from normal days to haze days were greater when comparison to sulfur oxidation ratios (SOR). In the polluted periods, sulfate and nitrate formations were facilitated by water content increase. Strong linear correlation coefficients between SOR (R2 = 0.81) and NOR (R2 = 0.55) with aerosol water content indicated that the gas-liquid reaction of SO2 and NO2 is the major pathway of sulfate and nitrate formation during severe haze episodes. In contrast, the NHR and aerosol water content exhibited a logarithmic relationship, which reveals that when water content was greater than 100 μg m−3, the gas-particle partitioning ratio of ammonium was basically unchanged following an increase in water content. © 2021 Elsevier Ltd
关键词	Aerosol water content Ammonia Nitrate Sulfate Water-soluble ions
语种	英语
scopus关键词	Aerosols; Ammonia; Ions; Nitrates; Sulfur dioxide; Atmospheric fine particles; Extreme pollution events; Gas-particle partitioning; Increase in water content; Linear correlation coefficient; Meteorological condition; Secondary inorganic aerosol; Water soluble inorganic ions; Water pollution; ammonia; ammonium nitrate; ammonium sulfate; cation; hydroxyl radical; ion; nitrate; nitrogen; nitrogen oxide; ozone; sulfate; sulfur; aerosol; aerosol composition; air quality; ammonia; ammonium; atmospheric pollution; haze; inorganic compound; oxidation; particulate matter; aerosol; air pollution; ambient air; Article; body water; chemical reaction; China; comparative study; concentration process; controlled study; correlation coefficient; gas; haze; humidity; liquid; meteorology; oxidation kinetics; particulate matter 2.5; pH; priority journal; thermodynamics; water content; winter; China; Shaanxi; Xian
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/248524
作者单位	State Key Laboratory of Loess and Quaternary Geology (SKLLQG), Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; Key Laboratory of Aerosol Chemistry & Physics (KLACP), Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; Department of Environmental Engineering, Xi'an Jiaotong University, Xi'an, 710049, China; Xi'an Institute for Innovative Earth Environment Research, Xi'an, 710061, China; School of Chemical and Environmental Engineering, Jiangsu University of Technology, Changzhou, 213001, China; Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Forschungsstrasse 111, Villigen PSI5232, Switzerland
推荐引用方式 GB/T 7714	Zhang T.,Shen Z.X.,Su H.,et al. Effects of Aerosol Water Content on the formation of secondary inorganic aerosol during a Winter Heavy PM2.5 Pollution Episode in Xi'an, China[J],2021,252.
APA	Zhang T..,Shen Z.X..,Su H..,Liu S.X..,Zhou J.M..,...&Cao J.J..(2021).Effects of Aerosol Water Content on the formation of secondary inorganic aerosol during a Winter Heavy PM2.5 Pollution Episode in Xi'an, China.ATMOSPHERIC ENVIRONMENT,252.
MLA	Zhang T.,et al."Effects of Aerosol Water Content on the formation of secondary inorganic aerosol during a Winter Heavy PM2.5 Pollution Episode in Xi'an, China".ATMOSPHERIC ENVIRONMENT 252(2021).