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| Titel |
The European aerosol budget in 2006 |
| VerfasserIn |
J. M. J. Aan de Brugh, M. Schaap, E. Vignati, F. Dentener, M. Kahnert, M. Sofiev, V. Huijnen, M. C. Krol |
| 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 ; 11, no. 3 ; Nr. 11, no. 3 (2011-02-09), S.1117-1139 |
| Datensatznummer |
250009295
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| Publikation (Nr.) |
 copernicus.org/acp-11-1117-2011.pdf |
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| Zusammenfassung |
| This paper presents the aerosol budget over Europe in 2006 calculated with
the global transport model TM5 coupled to the size-resolved aerosol module
M7. Comparison with ground observations indicates that the model reproduces
the observed concentrations quite well with an expected slight
underestimation of PM10 due to missing emissions (e.g. resuspension). We
model that a little less than half of the anthropogenic aerosols emitted in
Europe are exported and the rest is removed by deposition. The anthropogenic
aerosols are removed mostly by rain (95%) and only 5% is removed by dry
deposition. For the larger natural aerosols, especially sea salt, a larger
fraction is removed by dry processes (sea salt: 70%, mineral dust: 35%). We
model transport of aerosols in the jet stream in the higher atmosphere and
an import of Sahara dust from the south at high altitudes. Comparison with
optical measurements shows that the model reproduces the Ångström
parameter very well, which indicates a correct simulation of the aerosol size
distribution. However, we underestimate the aerosol optical
depth. Because the surface concentrations are close to the observations, the
shortage of aerosol in the model is probably at higher altitudes. We show
that the discrepancies are mainly caused by an overestimation of wet-removal
rates. To match the observations, the wet-removal rates have to be scaled
down by a factor of about 5. In that case the modelled ground-level
concentrations of sulphate and sea salt increase by 50% (which deteriorates
the match), while other components stay roughly the same. Finally, it is
shown that in particular events, improved fire emission estimates may
significantly improve the ability of the model to simulate the aerosol
optical depth. We stress that discrepancies in aerosol models can be
adequately analysed if all models would provide (regional) aerosol budgets,
as presented in the current study. |
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