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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 15, issue 10
Atmos. Chem. Phys., 15, 5973-5986, 2015
https://doi.org/10.5194/acp-15-5973-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 15, 5973-5986, 2015
https://doi.org/10.5194/acp-15-5973-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 29 May 2015

Research article | 29 May 2015

Evaluation of updated nitric acid chemistry on ozone precursors and radiative effects

K. M. Seltzer1, W. Vizuete2, and B. H. Henderson1 K. M. Seltzer et al.
  • 1Department of Environmental Engineering Sciences, University of Florida, Gainesville, FL, USA
  • 2Department of Environmental Science and Engineering, University of North Carolina, Chapel Hill, NC, USA

Abstract. This study shows that revising the reaction rate of NO2 + HO· → HNO3 improves simulated nitrogen partitioning and changes the simulated radiative effects of several short-lived climate forcers (SLCF). Both laboratory and field study analyses have found that the reaction rate should be reduced by 13–30% from current recommendations. We evaluate the GEOS-Chem model over North America with and without the recommended update using observations from the Intercontinental Chemical Transport Experiment – North America (INTEX-NA) Phase A campaign. Revising the NO2 + HO· → HNO3 rate coefficient improves model performance of oxidized nitrogen partitioning by increasing NOx concentrations in the upper troposphere and decreasing HNO3 throughout the troposphere. The increase in NOx concentrations has a corresponding global increase in O3 concentrations and local increases in sulfate aerosols, causing a perturbation in simulated radiative effects. These findings demonstrate the positive influence the mechanism update has on the partitioning of oxidized nitrogen species, the benefits it provides when compared to aircraft observations, and the simulated radiative effects that the reduction induces.

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