Global and regional effects of the photochemistry of CH3O2NO2: Evidence from ARCTAS

  • Browne E
  • Perring A
  • Wooldridge P
 et al. 
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Using measurements from the NASA Arctic Research of the Composition of
the Troposphere from Aircraft and Satellites (ARCTAS) experiment, we
show that methyl peroxy nitrate (CH3O2NO2) is present in concentrations
of similar to 5-15 pptv in the springtime arctic upper troposphere. We
investigate the regional and global effects of CH3O2NO2 by including its
chemistry in the GEOS-Chem 3-D global chemical transport model. We find
that at temperatures below 240 K inclusion of CH3O2NO2 chemistry results
in decreases of up to similar to 20% in NOx, similar to 20% in N2O5,
similar to 5% in HNO3, similar to 2% in ozone, and increases in methyl
hydrogen peroxide of up to similar to 14%. Larger changes are observed
in biomass burning plumes lofted to high altitude. Additionally, by
sequestering NOx at low temperatures, CH3O2NO2 decreases the cycling of
HO2 to OH, resulting in a larger upper tropospheric HO2 to OH ratio.
These results may impact some estimates of lightning NOx sources as well
as help explain differences between models and measurements of upper
tropospheric composition.

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  • E. C. Browne

  • A. E. Perring

  • P. J. Wooldridge

  • E. Apel

  • S. R. Hall

  • L. G. Huey

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