气候变化领域集成服务门户(CCPortal): Characterization and source analysis of water–soluble ions in PM2.5 at a background site in Central China

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DOI	10.1016/j.atmosres.2020.104881
	Characterization and source analysis of water–soluble ions in PM2.5 at a background site in Central China
	Xie Y.; Lu H.; Yi A.; Zhang Z.; Zheng N.; Fang X.; Xiao H.
发表日期	2020
ISSN	0169-8095
卷号	239
英文摘要	Little updated observation of background aerosols in Central China is available since the clean air actions, despite increasing aerosols pollution in this region. PM2.5 was sampled at Dongting Lake during September 2017 to August 2018 to probe the chemical characteristics of background PM2.5 in Central China. We sampled aerosols at an urban site simultaneously. Annual mean PM2.5 level reached 43.4 μg m−3, and SO4 2−, NO3 −, and NH4 + (sulfate–nitrate–ammonium, simplified as SNA) accounted for 22.8%, 26.8%, and 15.0%, respectively. PM2.5 and most ions levels were highest during winter and lowest during summer. PM2.5 mass was driven by NO3 − during cold months (October–March) or SO4 2− during warm months (September, April–August), suggesting that different emission control measures should be applied in different seasons in future air quality policy of this region. Both SO4 2− and NO3 − were almost completely neutralized by NH4 +. Low temperature increased the SO4 2− concentration and sulfur oxidation ratio. Low temperature also facilitated the partition of NO3 − from gas phase into particle phase. Severe particulate pollutions occurred in cold months when the diffusion and wet scavenging of aerosols and volatilization of NH4NO3 were weak, and the NO2 concentration was high. An interesting finding was the highest NO3 − concentration and conversion ratios for SNA as well as lowest SO4 2− concentration in Dongting Lake among major background sites, despite low levels of local gaseous precursors. Industry, secondary SO4 2−, and NO3 − were indentified as main sources of PM2.5 mass based on PMF analysis. Concurrent occurrences of PM2.5 and SNA pollution at Dongting Lake and Wuhan sites as well as back trajectories verified the regional effect. The results will be helpful for investigating water–soluble ions and the major sources as well as geographical origins for PM2.5 at Central China. © 2020 Elsevier B.V.
英文关键词	Central China; Formation mechanism; PM2.5; SNA; Source identification; Water–soluble ions characteristics
学科领域	Aerosols; Air quality; Emission control; Ions; Lakes; Quality control; Sulfur compounds; Temperature; Urban growth; Central chinas; Formation mechanism; PM2.5; Soluble ions; Source identification; Lake pollution; aerosol; air quality; emission control; formation mechanism; particulate matter; source identification; China; Dongting Lake; Hunan
语种	英语
scopus关键词	Aerosols; Air quality; Emission control; Ions; Lakes; Quality control; Sulfur compounds; Temperature; Urban growth; Central chinas; Formation mechanism; PM2.5; Soluble ions; Source identification; Lake pollution; aerosol; air quality; emission control; formation mechanism; particulate matter; source identification; China; Dongting Lake; Hunan
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120413
作者单位	Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution, College of Water Resources and environmental Engineering, East China University of Technology, Nanchang, 330013, China; Dongting Lake Station for Wetland Ecosystem Research, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, 410125, China
推荐引用方式 GB/T 7714	Xie Y.,Lu H.,Yi A.,等. Characterization and source analysis of water–soluble ions in PM2.5 at a background site in Central China[J],2020,239.
APA	Xie Y..,Lu H..,Yi A..,Zhang Z..,Zheng N..,...&Xiao H..(2020).Characterization and source analysis of water–soluble ions in PM2.5 at a background site in Central China.Atmospheric Research,239.
MLA	Xie Y.,et al."Characterization and source analysis of water–soluble ions in PM2.5 at a background site in Central China".Atmospheric Research 239(2020).