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| Titel |
CELLS v1.0: updated and parallelized version of an electrical scheme to simulate multiple electrified clouds and flashes over large domains |
| VerfasserIn |
C. Barthe, M. Chong, J.-P. Pinty, C. Bovalo, J. Escobar |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 5, no. 1 ; Nr. 5, no. 1 (2012-01-26), S.167-184 |
| Datensatznummer |
250002298
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| Publikation (Nr.) |
 copernicus.org/gmd-5-167-2012.pdf |
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| Zusammenfassung |
The paper describes the fully parallelized electrical scheme CELLS which is
suitable to simulate explicitly electrified storm systems on parallel
computers. Our motivation here is to show that a cloud electricity scheme can
be developed for use on large grids with complex terrain. Large computational
domains are needed to perform real case meteorological simulations with many
independent convective cells.
The scheme computes the bulk electric charge attached to each cloud particle
and hydrometeor. Positive and negative ions are also taken into account.
Several parametrizations of the dominant non-inductive charging process are
included and an inductive charging process as well. The electric field is
obtained by inverting the Gauss equation with an extension to
terrain-following coordinates. The new feature concerns the lightning flash
scheme which is a simplified version of an older detailed sequential scheme.
Flashes are composed of a bidirectional leader phase (vertical extension from
the triggering point) and a phase obeying a fractal law (with horizontal
extension on electrically charged zones). The originality of the scheme lies
in the way the branching phase is treated to get a parallel code.
The complete electrification scheme is tested for the 10 July 1996 STERAO
case and for the 21 July 1998 EULINOX case. Flash characteristics are
analysed in detail and additional sensitivity experiments are performed for
the STERAO case. Although the simulations were run for flat terrain
conditions, they show that the model behaves well on multiprocessor
computers. This opens a wide area of application for this electrical scheme
with the next objective of running real meterological case on large domains. |
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