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| Titel |
Aqua Planet Experiments with a new AGCM using Icosahedral-hexagonal grids |
| VerfasserIn |
R. Mittal, H. C. Upadhyaya, O. P. Sharma |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250019174
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| Zusammenfassung |
| A numerical scheme is presented which has been used for developing a new dynamical core on icosahedral-hexagonal grid. This global model is based on the governing equations of a well established atmospheric general circulation model (LMDZ). The discrete form of equations as implemented in the design of this new model is described. The two dynamical cores – LMDZ model and the new model – are then tested using standard test cases.
Indeed, the dynamical core of a general circulation model can be isolated from the physics and can be tested independently. Following this philosophy, dry dynamics is first tested with Jablonowski-Williamson idealized baroclinic wave test case (to assess the capacity of model to capture steep gradients. Then the Held-Suarez test is performed to obtain a balanced state of the atmosphere after a long term model integration. The moisture tendency (transport) equation is tested separately for the cosine bell and idealized cyclogenesis test cases. Finally some aqua-planet experiments are performed with the new model. The results for this test case are presented along with a discussion on possible limitations that have been noted for the new model |
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