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| Titel |
Evaluation of updated nitric acid chemistry on ozone precursors and radiative effects |
| VerfasserIn |
K. M. Seltzer, W. Vizuete, B. H. Henderson |
| 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 ; 15, no. 10 ; Nr. 15, no. 10 (2015-05-29), S.5973-5986 |
| Datensatznummer |
250119767
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| Publikation (Nr.) |
 copernicus.org/acp-15-5973-2015.pdf |
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| Zusammenfassung |
| 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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