气候变化领域集成服务门户(CCPortal): Nitrogen isotopes in nitrate aerosols collected in the remote marine boundary layer: Implications for nitrogen isotopic fractionations among atmospheric reactive nitrogen species

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DOI	10.1016/j.atmosenv.2020.118028
	Nitrogen isotopes in nitrate aerosols collected in the remote marine boundary layer: Implications for nitrogen isotopic fractionations among atmospheric reactive nitrogen species
	Li J.; Davy P.; Harvey M.; Katzman T.; Mitchell T.; Michalski G.
发表日期	2021
ISSN	1352-2310
卷号	245
英文摘要	The nitrogen isotopic composition (δ15N) of atmospheric nitrate aerosols is determined by both the δ15N of its precursor, NOx emissions, and the isotopic fractionations during the atmospheric oxidation of NOx. However, the latter has not been well-understood nor quantified by field observations. In addition, the seasonal variations of this isotopic fractionation have not been determined. To better understand this isotopic fractionation process, in this study, we analyzed the δ15N of nitrate aerosols collected from June 30, 2015 to August 6, 2016 at Baring Head, New Zealand, where the sources of NOx are well-studied. Our results showed that the δ15N values in nitrate aerosols display a clear seasonal variation, with lower δ15N values (−12‰ to ~ -9‰) in the summer (January to March) and higher δ15N values (0‰ to 3‰) in the winter (June–August), while the δ15N values of NOx sources exhibit a narrow range of variation from −10.7 ± 1.4‰ to −9.8 ± 1.4‰. We attribute this discrepancy to the significant and variable isotopic fractionations during the oxidation processes of NOx. We then quantified the isotopic fractionation during 1) the equilibrium and kinetic isotopic fractionations between NO and NO2; and 2) the oxidation of NO2 to nitrate. Our calculations suggest that at Baring Head, the seasonal variations in the oxidation pathways of NO2 are the main driver of the seasonal variations of nitrate δ15N values. Furthermore, the overall isotopic fractionation factors of the oxidation process determined by two models (Kinetic fractionation model and Equilibrium fractionation model) are generally lower in the summer (from +6.3 ± 1.7‰ to +9.5 ± 5.2‰)and higher in the winter (from +15.8 ± 1.9‰ to +17.0 ± 2.4‰). © 2020 Elsevier Ltd
关键词	Isotopic fractionation Nitrate aerosols Nitrogen isotopes
语种	英语
scopus关键词	Aerosols; Atmospheric boundary layer; Nitrates; Nitrogen oxides; Oxidation; Atmospheric nitrates; Atmospheric oxidation; Equilibrium fractionations; Isotopic fractionation factors; Isotopic fractionations; Kinetic fractionations; Marine boundary layers; Reactive nitrogen species; Isotopes; nitrate; nitrogen 15; nitrogen dioxide; nitrogen oxide; reactive nitrogen species; aerosol composition; boundary layer; fractionation; isotopic composition; nitrate; oxidation; reaction kinetics; reactive transport; seasonal variation; Article; atmosphere; boundary layer; denitrifying bacterium; fractionation; marine environment; New Zealand; nonhuman; oxidation; particulate matter; priority journal; Pseudomonas aureofaciens; quantitative analysis; seasonal variation; summer; winter; Baring Head; New Zealand; New Zealand; North Island; Wellington [North Island]
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/248737
作者单位	Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West LafayetteIN, United States; National Isotope Centre, Institute of Geological and Nuclear Sciences, 30 Gracefield Road, PO Box 31-312, Lower Hutt, New Zealand; Department of Chemistry, Purdue University, West LafayetteIN, United States; National Institute of Water and Atmospheric Research, Wellington, New Zealand; Greater Wellington Regional Council, Shed 39, 2 Fryatt Quay, Pipitea, Wellington, New Zealand
推荐引用方式 GB/T 7714	Li J.,Davy P.,Harvey M.,et al. Nitrogen isotopes in nitrate aerosols collected in the remote marine boundary layer: Implications for nitrogen isotopic fractionations among atmospheric reactive nitrogen species[J],2021,245.
APA	Li J.,Davy P.,Harvey M.,Katzman T.,Mitchell T.,&Michalski G..(2021).Nitrogen isotopes in nitrate aerosols collected in the remote marine boundary layer: Implications for nitrogen isotopic fractionations among atmospheric reactive nitrogen species.ATMOSPHERIC ENVIRONMENT,245.
MLA	Li J.,et al."Nitrogen isotopes in nitrate aerosols collected in the remote marine boundary layer: Implications for nitrogen isotopic fractionations among atmospheric reactive nitrogen species".ATMOSPHERIC ENVIRONMENT 245(2021).