Atmos. Chem. Phys. Discuss., 12, 24287-24349, 2012
www.atmos-chem-phys-discuss.net/12/24287/2012/
doi:10.5194/acpd-12-24287-2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Global sensitivity of aviation NOx effects to the HNO3-forming channel of the HO2+NO reaction
K. Gottschaldt1, C. Voigt1,2, P. Jöckel1, M. Righi1, R. Deckert1, and S. Dietmüller1
1Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany
2Johannes-Gutenberg-Universität, Institut für Physik der Atmosphäre, Mainz, Germany

Abstract. The impact of a recently proposed HNO3-forming channel of the HO2+NO reaction (Butkovskaya et al., 2005, 2007) on atmospheric mixing ratios of ozone, methane and their precursors is assessed with a global stratosphere-troposphere chemistry-climate model. Previous modelling studies applied a rate coefficient that depends only on pressure and temperature. We additionally considered a possible enhancement of the reaction by humidity, as found by a laboratory study (Butkovskaya et al., 2009). This particularly reduces the oxidation capacity of the atmosphere, increasing methane lifetime significantly.

The effects of aircraft NOx emissions on atmospheric chemistry are altered when considering the above reaction, resulting in a negative net radiative forcing relative to an atmosphere without aviation NOx. Uncertainties associated with the inclusion of the HO2+NO → HNO3 reaction and with its corresponding rate coefficient propagate a considerable additional uncertainty on estimates of the climate impact of aviation and on NOx-related mitigation strategies.


Citation: Gottschaldt, K., Voigt, C., Jöckel, P., Righi, M., Deckert, R., and Dietmüller, S.: Global sensitivity of aviation NOx effects to the HNO3-forming channel of the HO2+NO reaction, Atmos. Chem. Phys. Discuss., 12, 24287-24349, doi:10.5194/acpd-12-24287-2012, 2012.
 
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