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DOI	10.5194/acp-20-3091-2020
	Kinetics of the OH+NO2 reaction: Effect of water vapour and new parameterization for global modelling
	Amedro D.; Berasategui M.; Bunkan A.J.C.; Pozzer A.; Lelieveld J.; Crowley J.N.
发表日期	2020
ISSN	1680-7316
起始页码	3091
结束页码	3105
卷号	20 期号:5
英文摘要	The effect of water vapour on the rate coefficient for the atmospherically important, termolecular reaction between OH and NO2 was determined in He-H2O (277, 291, and 332 K) and N2-H2O bath gases (292 K). Combining pulsed-laser photolytic generation of OH and its detection by laser-induced fluorescence (PLP-LIF) with in situ, optical measurement of both NO2 and H2O, we were able to show that (in contrast to previous investigations) the presence of H2O increases the rate coefficient significantly. We derive a rate coefficient for H2O bath gas at the low-pressure limit (k H2O 0 ) of 15:91030 cm6 molecule2 s1. This indicates that H2O is a more efficient collisional quencher (by a factor of 6) of the initially formed HO-NO2 association complex than N2, and it is a factor of 8 more efficient than O2. Ignoring the effect of water vapour will lead to an underestimation of the rate coefficient by up to 15 %, e.g. in the tropical boundary layer. Combining the new experimental results from this study with those from our previous paper in which we report rate coefficients obtained in N2 and O2 bath gases (Amedro et al., 2019), we derive a new parameterization for atmospheric modelling of the OHCNO2 reaction and use this in a chemical transport model (EMAC) to examine the impact of the new data on the global distribution of NO2, HNO3, and OH. Use of the new parameters (rather than those given in the IUPAC and NASA evaluations) results in significant changes in the HNO3=NO2 ratio and NOx concentrations (the sign of which depends on which evaluation is used as reference). The model predicts the presence of HOONO (formed along with HNO3 in the title reaction) in concentrations similar to those of HO2NO2 at the tropical tropopause. © 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	atmospheric chemistry; concentration (composition); hydroxide; modeling; nitrogen dioxide; parameterization; reaction kinetics; water vapor
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/141479
作者单位	Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, 55128, Germany
推荐引用方式 GB/T 7714	Amedro D.,Berasategui M.,Bunkan A.J.C.,et al. Kinetics of the OH+NO2 reaction: Effect of water vapour and new parameterization for global modelling[J],2020,20(5).
APA	Amedro D.,Berasategui M.,Bunkan A.J.C.,Pozzer A.,Lelieveld J.,&Crowley J.N..(2020).Kinetics of the OH+NO2 reaction: Effect of water vapour and new parameterization for global modelling.Atmospheric Chemistry and Physics,20(5).
MLA	Amedro D.,et al."Kinetics of the OH+NO2 reaction: Effect of water vapour and new parameterization for global modelling".Atmospheric Chemistry and Physics 20.5(2020).