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| Titel |
Global and regional effects of the photochemistry of CH3O2NO2: evidence from ARCTAS |
| VerfasserIn |
E. C. Browne, A. E. Perring, P. J. Wooldridge, E. Apel, S. R. Hall, L. G. Huey, J. Mao, K. M. Spencer, J. M. St. Clair, A. J. Weinheimer, A. Wisthaler, R. C. Cohen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 9 ; Nr. 11, no. 9 (2011-05-06), S.4209-4219 |
| Datensatznummer |
250009699
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| Publikation (Nr.) |
 copernicus.org/acp-11-4209-2011.pdf |
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| Zusammenfassung |
| 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 ~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 ~20 % in NOx,
~20 % in N2O5, ~5 % in
HNO3, ~2 % in ozone, and increases in methyl hydrogen peroxide
of up 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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