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| Titel |
Observations of gas- and aerosol-phase organic nitrates at BEACHON-RoMBAS 2011 |
| VerfasserIn |
J. L. Fry, D. C. Draper, K. J. Zarzana, P. Campuzano-Jost, D. A. Day, J. L. Jimenez, S. S. Brown, R. C. Cohen, L. Kaser, A. Hansel, L. Cappellin, T. Karl, A. Hodzic Roux, A. Turnipseed, C. Cantrell, B. L. Lefer, N. Grossberg |
| 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 ; 13, no. 17 ; Nr. 13, no. 17 (2013-09-02), S.8585-8605 |
| Datensatznummer |
250085660
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| Publikation (Nr.) |
 copernicus.org/acp-13-8585-2013.pdf |
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| Zusammenfassung |
| At the Rocky Mountain Biogenic Aerosol Study (BEACHON-RoMBAS) field campaign
in the Colorado front range, July–August 2011, measurements of gas- and
aerosol-phase organic nitrates enabled a study of the role of NOx
(NOx = NO + NO2) in oxidation of forest-emitted volatile organic compounds (VOCs) and
subsequent aerosol formation. Substantial formation of peroxy- and
alkyl-nitrates is observed every morning, with an apparent 2.9% yield of
alkyl nitrates from daytime RO2 + NO reactions. Aerosol-phase
organic nitrates, however, peak in concentration during the night, with
concentrations up to 140 ppt as measured by both optical spectroscopic and
mass spectrometric instruments. The diurnal cycle in aerosol fraction of
organic nitrates shows an equilibrium-like response to the diurnal
temperature cycle, suggesting some reversible absorptive partitioning, but
the full dynamic range cannot be reproduced by thermodynamic repartitioning
alone. Nighttime aerosol organic nitrate is observed to be positively
correlated with [NO2] × [O3] but not with [O3]. These
observations support the role of nighttime NO3-initiated oxidation of
monoterpenes as a significant source of nighttime aerosol. Nighttime
production of organic nitrates is comparable in magnitude to daytime photochemical production at
this site, which we postulate to be representative of the Colorado front
range forests. |
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