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| Titel |
Climate simulation in mountain regions: why we need sub-km-scale resolution |
| VerfasserIn |
Petra Seibert, Irene Schicker, Delia Arnold, Herbert Formayer, Imran Nadeem |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250039570
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| Zusammenfassung |
| Both the numerical weather prediction and climate modelling communities strive to
continuosly increase the resolution of their atmospheric simulation models. It has been
recognised that resolution is especially important in mountain regions. Usually, these
improvements go by small steps, e.g. from 50Â km grid distance to 15Â km, then to 10 and
maybe to 5Â km. However, there are arguments that the benefit of the step 50 - 15Â km is
much larger than that from 15 - 5Â km. Results at 5Â km inside a mountain region like the
Alps may even be more troublesome to use than those at 15Â km, as valleys and ridges now
start to be resolved, but are still far away from being represented with their true shape
and depth/height. Furthermore, higher horizontal resolution means steeper model
levels and that means more errors, as most models have not been developed for
steep topography. Typical effects of such problems are wrong spatial distribution
and/or amount of precipitation, and inability to properly reproduce the temperature
regime inside valleys. Approaches where only some components are treated at high
resolution are insufficient as this does not remove numerical errors and does not
consider the dynamical linkage between the scales. With this in mind, we have
started the project HIRMOD: High-resolution atmospheric modelling in complex
terrain for future climate simulations in the context of the Austrian Climate Research
Programme. It aims at working with MM5 and WRF at resolutions |
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