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| Titel |
Aerosol-cloud-precipitation effects over Germany as simulated by a convective-scale numerical weather prediction model |
| VerfasserIn |
A. Seifert, C. Köhler, K. D. Beheng |
| 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 ; 12, no. 2 ; Nr. 12, no. 2 (2012-01-16), S.709-725 |
| Datensatznummer |
250010525
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| Publikation (Nr.) |
 copernicus.org/acp-12-709-2012.pdf |
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| Zusammenfassung |
| Possible aerosol-cloud-precipitation effects over Germany are
investigated using the COSMO model in a convection-permitting
configuration close to the operational COSMO-DE. Aerosol effects on
clouds and precipitation are modeled by using an advanced two-moment
microphysical parameterization taking into account aerosol
assumptions for cloud condensation nuclei (CCN) as well as ice
nuclei (IN). Simulations of three summer seasons have been performed
with various aerosol assumptions, and are analysed regarding surface
precipitation, cloud properties, and the indirect aerosol effect on
near-surface temperature. We find that the CCN and IN assumptions
have a strong effect on cloud properties, like condensate amounts of
cloud water, snow and rain as well as on the glaciation of the
clouds, but the effects on surface precipitation are – when averaged
over space and time – small. This robustness can only be understood
by the combined action of microphysical and dynamical processes. On
one hand, this shows that clouds can be interpreted as a buffered
system where significant changes to environmental parameters, like
aerosols, have little effect on the resulting surface
precipitation. On the other hand, this buffering is not active for
the radiative effects of clouds, and the changes in cloud properties
due to aerosol perturbations may have a significant effect on radiation
and near-surface temperature. |
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