气候变化领域集成服务门户(CCPortal): Measurement report: Nitrogen isotopes (δ15N) and first quantification of oxygen isotope anomalies (Δ 17O, δ 18O) in atmospheric nitrogen dioxide

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DOI	10.5194/acp-21-10477-2021
	Measurement report: Nitrogen isotopes (δ15N) and first quantification of oxygen isotope anomalies (Δ 17O, δ 18O) in atmospheric nitrogen dioxide
	Albertin S.; Savarino J.; Bekki S.; Barbero A.; Caillon N.
发表日期	2021
ISSN	1680-7316
起始页码	10477
结束页码	10497
卷号	21 期号:13
英文摘要	The isotopic composition of nitrogen and oxygen in nitrogen dioxide (NO2) potentially carries a wealth of information about the dynamics of the nitrogen oxides (NOxĝ€¯Combining double low lineĝ€¯nitric oxide (NO)ĝ€¯+ĝ€¯NO2) chemistry in the atmosphere. While nitrogen isotopes of NO2 are subtle indicators of NOx emissions and chemistry, oxygen isotopes are believed to reflect only the O3ĝ€¯/ĝ€¯NOxĝ€¯/ĝ€¯VOC chemical regime in different atmospheric environments. In order to access this potential tracer of the tropospheric chemistry, we have developed an efficient active method to trap atmospheric NO2 on denuder tubes and measured, for the first time, its multi-isotopic composition (δ15N, δ18O, and δ17O). The δ17O values of NO2 trapped at our site in Grenoble, France, show a large diurnal cycle peaking in late morning at (39.2ĝ€¯±ĝ€¯0.3)ĝ€¯‰ and decreasing at night until (20.5ĝ€¯±ĝ€¯0.3)ĝ€¯‰. On top of this diurnal cycle, δ17O also exhibits substantial daytime variability (from 29.7ĝ€¯‰ to 39.2ĝ€¯‰), certainly driven by changes in the O3 to peroxyl radicals (RO2) ratio. The nighttime decay of δ17O(NO2) appears to be driven by NO2 slow removal, mostly from conversion into N2O5, and its formation from the reaction between O3 and freshly emitted NO. As expected from a nighttime δ17O(NO2) expression, our δ17O(NO2) measured towards the end of the night is quantitatively consistent with typical values of δ17O(O3). Daytime N isotope fractionation is estimated using a general expression linking it to δ17O(NO2). An expression is also derived for the nighttime N isotope fractionation. In contrast to δ17O(NO2), δ15N(NO2) measurements exhibit little diurnal variability (-11.8ĝ€¯‰ to-4.9ĝ€¯‰) with negligible isotope fractionations between NO and NO2, mainly due to high NO2ĝ€¯/ĝ€¯NOx ratios, excepted during the morning rush hours. The main NOx emission sources are estimated using a Bayesian isotope mixing model, indicating the predominance of traffic emissions in this area. These preliminary results are very promising for using the combination of δ17O and δ15N of NO2 as a probe of the NOx sources and fate and for interpreting nitrate isotopic composition records. © 2021 Sarah Albertin et al.
语种	英语
scopus关键词	isotopic composition; isotopic fractionation; nitrogen dioxide; nitrogen isotope; oxygen isotope; peroxy radical; Auvergne-Rhone-Alpes; France; Grenoble; Isere
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246738
作者单位	LATMOS/IPSL, Sorbonne Université, UVSQ, CNRS, Paris, 75005, France; IGE, Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, Grenoble, 38000, France
推荐引用方式 GB/T 7714	Albertin S.,Savarino J.,Bekki S.,et al. Measurement report: Nitrogen isotopes (δ15N) and first quantification of oxygen isotope anomalies (Δ 17O, δ 18O) in atmospheric nitrogen dioxide[J],2021,21(13).
APA	Albertin S.,Savarino J.,Bekki S.,Barbero A.,&Caillon N..(2021).Measurement report: Nitrogen isotopes (δ15N) and first quantification of oxygen isotope anomalies (Δ 17O, δ 18O) in atmospheric nitrogen dioxide.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(13).
MLA	Albertin S.,et al."Measurement report: Nitrogen isotopes (δ15N) and first quantification of oxygen isotope anomalies (Δ 17O, δ 18O) in atmospheric nitrogen dioxide".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.13(2021).