气候变化领域集成服务门户(CCPortal): Impact of air transport and secondary formation on haze pollution in the Yangtze River Delta: In situ online observations in Shanghai and Nanjing

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DOI	10.1016/j.atmosenv.2020.117350
	Impact of air transport and secondary formation on haze pollution in the Yangtze River Delta: In situ online observations in Shanghai and Nanjing
	Sun P.; Nie W.; Wang T.; Chi X.; Huang X.; Xu Z.; Zhu C.; Wang L.; Qi X.; Zhang Q.; Ding A.
发表日期	2020
ISSN	13522310
卷号	225
英文摘要	Despite frequent haze pollution in China in recent years, our knowledge of regional pollution episodes associated with air transport and synoptic weather systems is limited. In this study, we conducted two intensive campaigns simultaneously to measure the highly time-resolved chemical composition of fine particles (PM2.5) in suburban Shanghai and Nanjing during the winter of 2017 and the summer of 2018. The average PM2.5 mass concentrations were 53.9 (65.7) μg m−3 and 32.8 (37.3) μg m−3 in Shanghai (Nanjing) in winter and summer, respectively. In winter, extreme haze episodes were observed synchronously with enhanced contributions of nitrate at both sites and of low-volatile oxidized organic aerosol (LV-OOA) in Shanghai. Long-range transport from Northern China was demonstrated to play an important role in the episodes, which occurred simultaneously at both sites. Influenced by the cold fronts, Nanjing had a relatively longer pollution duration, whereas Shanghai exhibited faster PM increases. In summer, air masses passing through the city-clusters of the YRD were responsible for the pollution episodes. Low wind speeds, which favored the accumulation of primary aerosols, and strong photochemical activity indicated by high ozone level, which promoted the formation of secondary aerosols, resulted in elevated contributions of nitrate, Hydrocarbon-like organic aerosol (HOA) and semi-volatile oxidized organic aerosol (SV-OOA) to PM in Shanghai. In addition, a pollution episode dominated by increases of nitrate and organic aerosols was observed in Nanjing two days later despite the clean situation in Shanghai. Our results highlight the importance of regional or sub-regional emission control to mitigate haze pollution in city clusters, such as the YRD in Eastern China. © 2020 Elsevier Ltd
英文关键词	Aerosol pollution; Chemical composition; Regional air transport; Secondary formation; Yangtze River Delta
语种	英语
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/120689
作者单位	Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing, 210023, China; Jiangsu Provincial Collaborative Innovation Center of Climate Change, Nanjing, 210023, China; Department of Environmental Toxicology, University of California, DavisCA 95616, United States
推荐引用方式 GB/T 7714	Sun P.,Nie W.,Wang T.,et al. Impact of air transport and secondary formation on haze pollution in the Yangtze River Delta: In situ online observations in Shanghai and Nanjing[J],2020,225.
APA	Sun P..,Nie W..,Wang T..,Chi X..,Huang X..,...&Ding A..(2020).Impact of air transport and secondary formation on haze pollution in the Yangtze River Delta: In situ online observations in Shanghai and Nanjing.Atmospheric Environment,225.
MLA	Sun P.,et al."Impact of air transport and secondary formation on haze pollution in the Yangtze River Delta: In situ online observations in Shanghai and Nanjing".Atmospheric Environment 225(2020).