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| Titel |
Modeling the meteorological and chemical effects of secondary organic aerosols during an EUCAARI campaign |
| VerfasserIn |
E. Athanasopoulou, H. Vogel, B. Vogel, A. P. Tsimpidi, S. N. Pandis, C. Knote, C. Fountoukis |
| 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. 2 ; Nr. 13, no. 2 (2013-01-17), S.625-645 |
| Datensatznummer |
250017592
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| Publikation (Nr.) |
 copernicus.org/acp-13-625-2013.pdf |
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| Zusammenfassung |
| A volatility basis set (VBS) approach for the simulation of secondary
organic aerosol (SOA) formation is incorporated in the online coupled
atmospheric model system COSMO-ART and applied over Europe during the
EUCAARI May 2008 campaign. Organic aerosol performance is improved when
compared to the default SOA module of COSMO-ART (SORGAM) against high
temporal resolution aerosol mass spectrometer ground measurements. The
impact of SOA on the overall radiative budget was investigated. The mean
direct surface radiative cooling averaged over Europe is −1.2 W m−2,
representing approximately 20% of the total effect of aerosols on the
radiative budget. However, responses are not spatially correlated with the
radiative forcing, due to the nonlinear interactions among changes in
particle chemical composition, water content, size distribution and cloud
cover. These interactions initiated~by the effect of SOA on radiation are
found to result even in a positive forcing in specific areas. Further model
experiments showed that the availability of nitrogen oxides slightly affects
SOA production, but that the aging rate constant used in the VBS
approximation and boundary concentrations assumed in the model should be
carefully selected. The aging of SOA is found to reduce hourly nitrate
levels by up to 30%, while the condensation of inorganic species upon
pre-existing, SOA-rich particles results in a monthly average increase of
5% in sulfate and ammonium formation in the accumulation mode. |
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