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| Titel |
Towards NWP with the anelastic nonhydrostatic model EULAG - mountain flows |
| VerfasserIn |
B. Rosa, M. J. Kurowski, D. Wójcik, M. Z. Ziemiański |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250068266
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| Zusammenfassung |
| Contemporary numerical weather prediction (NWP) models are currently approaching 1km
of horizontal resolution. A more accurate representation of local mountain effects is expected
with this progress. However, the new technical and numerical challenges for such modeling
emerge as the flow conditions (e.g. steepness of the orographic slopes) become increasingly
complex. Therefore, it is necessary to develop effective tools to cope with these
problems.
The anelastic nonhydrostatic model EULAG is a well-established and robust fluid solver
that is a prospective dynamical core of a future weather forecasting model. It is extensively
tested for correct representation of orographic flows. The presentation demonstrates model’s
abilities for simulating (i) upstream effects of the atmospheric flow over a mountain ridge and
(ii) quasi-realistic Alpine summer convection. In the first case, a set of experiments was
carried out for different flow regimes (linear, non-linear) and different setup (w/o Coriolis
force, 2D/3D). The results were evaluated using reference solutions of Pierrehumbert and
Wyman (1985 JAS 42 977-1003). In the second case, the results of modeling of the Alpine
convection for limited physics are presented. This part is focused especially on
exploring the influence of horizontal grid resolution on the simulated convective
processes. |
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