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| Titel |
The fate of NOx emissions due to nocturnal oxidation at high latitudes: 1-D simulations and sensitivity experiments |
| VerfasserIn |
P. L. Joyce, R. von Glasow, W. R. Simpson |
| 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 ; 14, no. 14 ; Nr. 14, no. 14 (2014-07-29), S.7601-7616 |
| Datensatznummer |
250118910
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| Publikation (Nr.) |
 copernicus.org/acp-14-7601-2014.pdf |
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| Zusammenfassung |
| The fate of nitrogen oxide pollution during high-latitude winter is controlled by reactions of
dinitrogen pentoxide (N2O5) and is highly affected by the competition between
heterogeneous atmospheric reactions and deposition to the snowpack. MISTRA (MIcrophysical STRAtus), a 1-D photochemical
model, simulated an urban pollution plume from Fairbanks, Alaska to investigate this competition
of N2O5 reactions and explore sensitivity to model parameters. It was found that dry
deposition of N2O5 made up a significant fraction of N2O5 loss near the
snowpack, but reactions on aerosol particles dominated loss of N2O5 over the integrated
atmospheric column. Sensitivity experiments found the fate of NOx emissions were most
sensitive to NO emission flux, photolysis rates, and ambient temperature. The results
indicate a strong sensitivity to urban area density, season and clouds, and temperature, implying
a strong sensitivity of the results to urban planning and climate change. Results suggest that
secondary formation of particulate (PM2.5) nitrate in the Fairbanks downtown area does
not contribute significant mass to the total PM2.5 concentration, but appreciable
amounts are formed downwind of downtown due to nocturnal NOx oxidation and subsequent
reaction with ammonia on aerosol particles. |
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