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| Titel |
Exploiting the weekly cycle as observed over Europe to analyse aerosol indirect effects in two climate models |
| VerfasserIn |
J. Quaas, O. Boucher, A. Jones, G. P. Weedon, J. Kieser, H. Joos |
| 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 ; 9, no. 21 ; Nr. 9, no. 21 (2009-11-09), S.8493-8501 |
| Datensatznummer |
250007739
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| Publikation (Nr.) |
 copernicus.org/acp-9-8493-2009.pdf |
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| Zusammenfassung |
| A weekly cycle in aerosol pollution and some meteorological quantities is
observed over Europe. In the present study we exploit this effect to analyse
aerosol-cloud-radiation interactions. A weekly cycle is imposed on
anthropogenic emissions in two general circulation models that include
parameterizations of aerosol processes and cloud microphysics. It is found
that the simulated weekly cycles in sulfur dioxide, sulfate, and aerosol
optical depth in both models agree reasonably well with those observed
indicating model skill in simulating the aerosol cycle. A distinct weekly
cycle in cloud droplet number concentration is demonstrated in both
observations and models. For other variables, such as cloud liquid water
path, cloud cover, top-of-the-atmosphere radiation fluxes, precipitation,
and surface temperature, large variability and contradictory results between
observations, model simulations, and model control simulations without a
weekly cycle in emissions prevent us from reaching any firm conclusions
about the potential aerosol impact on meteorology or the realism of the
modelled second aerosol indirect effects. |
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