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| Titel |
Characterization of a large biogenic secondary organic aerosol event from eastern Canadian forests |
| VerfasserIn |
J. G. Slowik, C. Stroud, J. W. Bottenheim, P. C. Brickell, R. Y.-W. Chang, J. Liggio, P. A. Makar, R. V. Martin, M. D. Moran, N. C. Shantz, S. J. Sjostedt, A. Donkelaar, A. Vlasenko, H. A. Wiebe, A. G. Xia, J. Zhang, W. R. Leaitch, J. P. D. Abbatt |
| 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 ; 10, no. 6 ; Nr. 10, no. 6 (2010-03-26), S.2825-2845 |
| Datensatznummer |
250008259
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| Publikation (Nr.) |
 copernicus.org/acp-10-2825-2010.pdf |
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| Zusammenfassung |
| Measurements of aerosol composition, volatile organic compounds, and CO are
used to determine biogenic secondary organic aerosol (SOA) concentrations at
a rural site 70 km north of Toronto. These biogenic SOA levels are many
times higher than past observations and occur during a period of increasing
temperatures and outflow from Northern Ontario and Quebec forests in early
summer. A regional chemical transport model approximately predicts the event
timing and accurately predicts the aerosol loading, identifying the
precursors as monoterpene emissions from the coniferous forest. The
agreement between the measured and modeled biogenic aerosol concentrations
contrasts with model underpredictions for polluted regions. Correlations of
the oxygenated organic aerosol mass with tracers such as CO support a
secondary aerosol source and distinguish biogenic, pollution, and biomass
burning periods during the field campaign. Using the Master Chemical
Mechanism, it is shown that the levels of CO observed during the biogenic
event are consistent with a photochemical source arising from monoterpene
oxidation. The biogenic aerosol mass correlates with satellite measurements
of regional aerosol optical depth, indicating that the event extends across
the eastern Canadian forest. This regional event correlates with increased
temperatures, indicating that temperature-dependent forest emissions can
significantly affect climate through enhanced direct optical scattering and
higher cloud condensation nuclei numbers. |
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