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| Titel |
3-D model simulations of dynamical and microphysical interactions in pyroconvective clouds under idealized conditions |
| VerfasserIn |
P. Reutter, J. Trentmann, A. Seifert, P. Neis, H. Su, D. Chang, M. Herzog, H. Wernli, M. O. Andreae, U. Pöschl |
| 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 ; 14, no. 14 ; Nr. 14, no. 14 (2014-07-29), S.7573-7583 |
| Datensatznummer |
250118908
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| Publikation (Nr.) |
 copernicus.org/acp-14-7573-2014.pdf |
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| Zusammenfassung |
| Dynamical and microphysical processes in pyroconvective clouds in
mid-latitude conditions are investigated using idealized three-dimensional
simulations with the Active Tracer High resolution Atmospheric Model (ATHAM).
A state-of-the-art two-moment microphysical scheme building upon a realistic
parameterization of cloud condensation nuclei (CCN) activation has been implemented in order to study the
influence of aerosol concentration on cloud development. The results show
that aerosol concentration influences the formation of precipitation. For low
aerosol concentrations (NCN = 200 cm−3), rain droplets
are rapidly formed by autoconversion of cloud droplets. This also triggers
the formation of large graupel and hail particles, resulting in an early
onset of precipitation. With increasing aerosol concentration
(NCN = 1000 cm−3 and
NCN = 20 000 cm−3) the formation of rain droplets is
delayed due to more but smaller cloud droplets. Therefore, the formation of
ice crystals and snowflakes becomes more important for the eventual formation
of graupel and hail, which is delayed at higher aerosol concentrations. This
results in a delay of the onset of precipitation and a reduction of its
intensity with increasing aerosol concentration. This study is the first
detailed investigation of the interaction between cloud microphysics and the
dynamics of a pyroconvective cloud using the combination of a high-resolution
atmospheric model and a detailed microphysical scheme. |
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