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| Titel |
Two-way coupling of the global EMAC and the regional COSMO model using the Modular Earth Submodel System (MESSy) |
| VerfasserIn |
Astrid Kerkweg, Christiane Hofmann, Gregor Glaeser, Patrick Joeckel |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250104035
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| Publikation (Nr.) |
 EGU/EGU2015-3916.pdf |
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| Zusammenfassung |
| Based on the well established one-way on-line coupling of the regional chemistry climate
model COSMO/MESSy to the global EMAC (ECHAM5/MESSy for Atmospheric
Chemistry) model, a two-way coupling of these two models is developed within the MiKlip
(decadal predictions) subproject FLAGSHIP (Feedback of a Limited-Area model to the
Global Scale implemented for HIndcasts and Projections). By means of the two-way
coupling, smaller scale processes resolved in the COSMO model are fed back to the
global scale. Expectably, this improves the representation of processes on the global
scale.
The technical implementation of the two-way coupling includes a number of challenges,
especially the ECHAM and the COSMO model are models of different types: The global
ECHAM model has a spectral core and solves the hydrostatic equations of motion,
while the regional COSMO model is a non-hydrostatic grid point model. While
the coupling of passive tracers and the humidity fields functions well in our test
cases, the dynamical coupling proves to be an extra challenge, especially due to the
pressure based vertical grid and the spectral core of the model. Here, we report the
current status of the two-way coupling and show first results for idealised test cases. |
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