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| Titel |
Towards an online-coupled chemistry-climate model: evaluation of trace gases and aerosols in COSMO-ART |
| VerfasserIn |
C. Knote, D. Brunner, H. Vogel, J. Allan, A. Asmi, M. Äijälä, S. Carbone, H. D. Gon, J. L. Jimenez, A. Kiendler-Scharr, C. Mohr, L. Poulain, A. S. H. Prévôt, E. Swietlicki, B. Vogel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 4, no. 4 ; Nr. 4, no. 4 (2011-12-02), S.1077-1102 |
| Datensatznummer |
250001921
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| Publikation (Nr.) |
 copernicus.org/gmd-4-1077-2011.pdf |
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| Zusammenfassung |
| The online-coupled, regional chemistry transport model COSMO-ART is evaluated
for periods in all seasons against several measurement datasets to assess its
ability to represent gaseous pollutants and ambient aerosol characteristics
over the European domain. Measurements used in the comparison include
long-term station observations, satellite and ground-based remote sensing
products, and complex datasets of aerosol chemical composition and number
size distribution from recent field campaigns. This is the first time these
comprehensive measurements of aerosol characteristics in Europe are used to
evaluate a regional chemistry transport model. We show a detailed analysis of
the simulated size-resolved chemical composition under different
meteorological conditions. Mean, variability and spatial distribution of the
concentrations of O3 and NOx are well reproduced. SO2
is found to be overestimated, simulated PM2.5 and PM10
levels are on average underestimated, as is AOD. We find indications of an
overestimation of shipping emissions. Time evolution of aerosol chemical
composition is captured, although some biases are found in relative
composition. Nitrate aerosol components are on average
overestimated, and sulfates underestimated. The accuracy of simulated
organics depends strongly on season and location. While strongly
underestimated during summer, organic mass is comparable in spring and
autumn. We see indications for an overestimated fractional contribution of
primary organic matter in urban areas and an underestimation of SOA at many
locations. Aerosol number concentrations compare well with measurements for
larger size ranges, but overestimations of particle number concentration with
factors of 2–5 are found for particles smaller than 50 nm. Size
distribution characteristics are often close to measurements, but show
discrepancies at polluted sites. Suggestions for further improvement of the
modeling system consist of the inclusion of a revised secondary organic
aerosols scheme, aqueous-phase chemistry and improved aerosol boundary
conditions. Our work sets the basis for subsequent studies of aerosol
characteristics and climate impacts with COSMO-ART, and highlights areas
where improvements are necessary for current regional modeling systems in
general. |
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