Title
The European aerosol budget in 2006
Author
de Brugh, J.M.J.A.
Schaap, M.
Vignati, E.
Dentener, F.
Kahnert, M.
Sofiev, M.
Huijnen, V.
Krol, M.C.
Publication year
2011
Abstract
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. © 2011 Author(s).
Subject
Earth & Environment
CAS - Climate, Air and Sustainability
EELS - Earth, Environmental and Life Sciences
Environment
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http://resolver.tudelft.nl/uuid:266b374a-7fc0-4f96-b5cb-9dd81a3ddfb4
TNO identifier
427546
ISSN
1680-7316
Source
Atmospheric Chemistry and Physics, 11 (3), 1117-1139
Document type
article