Articles | Volume 20, issue 5
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, Matias Berasategui, Arne J. C. Bunkan, Andrea Pozzer, Jos Lelieveld, and John N. Crowley

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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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Subject: Gases | Research Activity: Laboratory Studies | Altitude Range: Troposphere | Science Focus: Chemistry (chemical composition and reactions)
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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,, 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,, 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,, 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. 
Short summary
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.
Final-revised paper