Articles | Volume 20, issue 5
Atmos. Chem. Phys., 20, 3091–3105, 2020
https://doi.org/10.5194/acp-20-3091-2020

Special issue: The Modular Earth Submodel System (MESSy) (ACP/GMD inter-journal...

Atmos. Chem. Phys., 20, 3091–3105, 2020
https://doi.org/10.5194/acp-20-3091-2020

Research article 16 Mar 2020

Research article | 16 Mar 2020

Kinetics of the OH + NO2 reaction: effect of water vapour and new parameterization for global modelling

Damien Amedro et al.

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Kinetics of the OH + NO2 reaction: rate coefficients (217–333 K, 16–1200 mbar) and fall-off parameters for N2 and O2 bath gases
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Temperature-(208–318 K) and pressure-(18–696 Torr) dependent rate coefficients for the reaction between OH and HNO3
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Cited articles

Allodi, M. A., Dunn, M. E., Livada, J., Kirschner, K. N., and Shields, G. C.: Do hydroxyl radical-water clusters, OH(H2O)(n), n=1–5, exist in the atmosphere?, J. Phys. Chem. A, 110, 13283-13289, https://doi.org/10.1021/jp064468l, 2006. 
Amedro, D., Bunkan, A. J. C., Berasategui, M., and Crowley, J. N.: Kinetics of the OH+ NO2 reaction: rate coefficients (217–333 K, 16–1200 mbar) and fall-off parameters for N2 and O2 bath gases, Atmos. Chem. Phys., 19, 10643–10657, https://doi.org/10.5194/acp-19-10643-2019, 2019. 
Anastasi, C., and Smith, I. W. M.: Rate measurements of reactions of OH by resonance absorption. Part 5. – Rate constants for OH +NO2 (+M)HNO3(+M) over a wide range of temperature and pressure, J. Chem. Soc. Faraday Transact., 72, 1459–1468, https://doi.org/10.1039/f29767201459, 1976. 
Anderson, J. G., Margitan, J. J., and Kaufman, F.: Gas-phase recombination of OH with NO and NO2, J. Chem. Phys., 60, 3310–3317, 1974. 
Anderson, L. G.: Absolute rate constants for the reaction of OH with NO2 in N2 and He from 225 to 389 K, J. Phys. Chem., 84, 2152–2155, 1980. 
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Our laboratory experiments show that the rate coefficient for the termolecular reaction between OH and NO2 is enhanced in the presence of water vapour. Using a chemistry transport model we show that our new parameterization of the temperature, pressure, and bath-gas dependence of this reaction has a significant impact on, for example, NOx and the HNO2 / NO2 ratio when compared to present recommendations.
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