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| Titel |
Nonlinear effects in a conceptual multilayer cloud model |
| VerfasserIn |
U. Wacker |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 13, no. 1 ; Nr. 13, no. 1 (2006-04-12), S.99-107 |
| Datensatznummer |
250011707
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| Publikation (Nr.) |
 copernicus.org/npg-13-99-2006.pdf |
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| Zusammenfassung |
| As conceptual model for a cloud a system is considered which is open for
condensate mass transport and subject to internal processes such as
cloud microphysical transformation and vertical condensate transport.
The effects of microphysical processes are represented in parameterized form and
the system is divided into two layers to account for the vertical structure.
The evolution is mathematically described in terms of four coupled nonlinear
ODEs; the prognostic variables are the mass concentrations of cloud water as
well as precipitation condensate in each of the layers.
In the absence of vertical velocity the evolution in the lower layer is
triggered by the evolution in the upper layer. In the presence of an upwind, the
dynamics in both layers is mutually coupled. Depending on the chosen parameter
values up to four steady states are found. When varying the parameter upwind
velocity, three regimes are distinguished:
For week upwind the long-term evolution is steered by the external sources; for
stronger upwind the cloud condensate is blown out of the cloud in the final state
and does not contribute to formation of precipitation; for intermediate upwind
multiple steady state
solution branches arise which characterize
the transition between those two regimes. |
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