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| Titel |
Organic nitrate aerosol formation via NO3 + biogenic volatile organic compounds in the southeastern United States |
| VerfasserIn |
B. R. Ayres, H. M. Allen, D. C. Draper, S. S. Brown, R. J. Wild, J. L. Jimenez, D. A. Day, P. Campuzano-Jost, W. Hu, J. Gouw, A. Koss, R. C. Cohen, K. C. Duffey, P. Romer, K. Baumann, E. Edgerton, S. Takahama, J. A. Thornton, B. H. Lee, F. D. Lopez-Hilfiker, C. Mohr, P. O. Wennberg, T. B. Nguyen, A. Teng, A. H. Goldstein, K. Olson, J. L. Fry |
| 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. 23 ; Nr. 15, no. 23 (2015-12-03), S.13377-13392 |
| Datensatznummer |
250120201
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| Publikation (Nr.) |
 copernicus.org/acp-15-13377-2015.pdf |
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| Zusammenfassung |
| Gas- and aerosol-phase measurements of oxidants, biogenic volatile organic
compounds (BVOCs) and organic nitrates made during the Southern Oxidant and Aerosol Study (SOAS campaign, Summer 2013) in central Alabama show
that a
nitrate radical (NO3) reaction with monoterpenes leads to significant
secondary aerosol formation. Cumulative losses of NO3 to terpenes are
correlated with increase in gas- and aerosol-organic nitrate concentrations
made during the campaign. Correlation of NO3 radical consumption to
organic nitrate aerosol formation as measured by aerosol mass spectrometry and thermal dissociation laser-induced fluorescence suggests a molar yield
of aerosol-phase monoterpene nitrates of 23–44 %. Compounds observed via
chemical ionization mass spectrometry (CIMS) are correlated to predicted
nitrate loss to BVOCs and show C10H17NO5, likely a hydroperoxy
nitrate, is a major nitrate-oxidized terpene product being incorporated into
aerosols. The comparable isoprene product C5H9NO5 was observed to
contribute less than 1 % of the total organic nitrate in the aerosol phase
and correlations show that it is principally a gas-phase product from nitrate
oxidation of isoprene. Organic nitrates comprise between 30 and 45 % of the
NOy budget during SOAS. Inorganic nitrates were also monitored and
showed that during incidents of increased coarse-mode mineral dust,
HNO3 uptake produced nitrate aerosol mass loading at a rate comparable to that
of organic nitrate produced via NO3 + BVOCs. |
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