气候变化领域集成服务门户(CCPortal): Sources and transformation of nitrate aerosol in winter 2017–2018 of megacity Beijing: Insights from an alternative approach

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DOI	10.1016/j.atmosenv.2020.117842
	Sources and transformation of nitrate aerosol in winter 2017–2018 of megacity Beijing: Insights from an alternative approach
	Zhang Z.; Guan H.; Luo L.; Zheng N.; Xiao H.; Liang Y.; Xiao H.
发表日期	2020
ISSN	1352-2310
卷号	241
英文摘要	The dual isotopic signatures of particulate nitrate (hereafter as δ15N–NO3- and δ18O–NO3-) have been extensively used to imprint the source and chemical transformation of atmospheric NOx (NOx = NO + NO2). For instance, the δ18O–NO3- elevated proportionally when NOx converted by O3. In the present study, daily PM2.5 samples (n = 91) were collected in winter Beijing (December to February in 2017–2018) and a two-endmember linear isotopic mixing model was used to model the endmember δ18O values of NO3− oxidized by O3 (termed as δ18Onoct) and the contribution of the different pathways (i.e., daytime and nocturnal oxidation pathways). During the campaign, the NO3− concentrations in PM2.5 varied from 0.3 to 46.3 μg m−3 (8.1 ± 9.8 μg m−3), δ15N–NO3- from +1.0‰ to +19.6‰ (12.5 ± 3.6‰) and δ18O–NO3- from +50.7‰ to +103.5‰ (74.9 ± 13.3‰). The Keeling plots indicated that the δ18Onoct endmember value was within the ranges based on theoretical approaches. The contribution of the nocturnal pathway to NO3− in PM2.5 ranged from 8.5 ± 3.2% in background days to approximately 100% in extremely polluted days, with a mean of 52.0 ± 25.5%. The determined δ15N–NO3- values (12.5 ± 3.6‰) were comparable with previous studies conducted in recent winter Beijing (2013–2017, i.e., average values of 11.9‰–13.8‰). Due to the optimization of energy structure in Beijing, we inferred that the dominant NOx source in recent wintertime was the vehicular exhaust. The Bayesian mixing model also confirmed that the contribution of vehicle exhaust/biomass burning sources to the NO3− was up to 70%. This study may further improve the understanding of NOx emission source and atmospheric processes in urban environments. © 2020 Elsevier Ltd
关键词	Nitrate aerosol Two-endmember isotopic mixing model Vehicular exhaust δ15N–NO3-δ18O-NO3-
语种	英语
scopus关键词	Atmospheric chemistry; Isotopes; Mixing; Nitrates; Structural optimization; Atmospheric process; Chemical transformations; Energy structures; Isotopic signatures; Oxidation pathway; Particulate nitrate; Theoretical approach; Urban environments; Nitrogen oxides; nitrate; aerosol; megacity; nitric oxide; pollutant source; spatiotemporal analysis; urban pollution; winter; aerosol; Article; biomass; chemical analysis; chemical reaction; China; controlled study; environmental monitoring; fractionation; isotope tracing; meteorology; oxidation; particulate matter; pH; priority journal; seasonal variation; thermodynamics; urban area; winter; Beijing [China]; China
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/248955
作者单位	Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution, East China University of Technology, Nanchang, 330013, China; School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang, 330013, China; The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
推荐引用方式 GB/T 7714	Zhang Z.,Guan H.,Luo L.,等. Sources and transformation of nitrate aerosol in winter 2017–2018 of megacity Beijing: Insights from an alternative approach[J],2020,241.
APA	Zhang Z..,Guan H..,Luo L..,Zheng N..,Xiao H..,...&Xiao H..(2020).Sources and transformation of nitrate aerosol in winter 2017–2018 of megacity Beijing: Insights from an alternative approach.ATMOSPHERIC ENVIRONMENT,241.
MLA	Zhang Z.,et al."Sources and transformation of nitrate aerosol in winter 2017–2018 of megacity Beijing: Insights from an alternative approach".ATMOSPHERIC ENVIRONMENT 241(2020).