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| Titel |
Towards multiscale simulation of moist global flows with soundproof equations |
| VerfasserIn |
Wojciech W. Grabowski, Marcin J. Kurowski, Piotr K. Smolarkiewicz |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250074768
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| Zusammenfassung |
| This presentation will discuss incorporation of phase changes of the water substance that accompany moist atmospheric flows into the all-scale atmospheric model based on soundproof equations. Specific issue concerns developing a theoretical basis and practical implementation to include pressure perturbations associated with atmospheric circulations, from small-scale to global, into representations of moist thermodynamics. In small-scale modeling using soundproof equations, pressure perturbations are obtained from the elliptic pressure solver and are typically excluded from the moist thermodynamics. For some small-scale or mesoscale extreme weather events such as a tornado or a hurricane, pressure perturbations are significant and neglecting them in the moist thermodynamics is no longer justifiable. We show through the theoretical analysis that, in larger-scale flows, at least the hydrostatic component of the pressure perturbation needs to be included because pressure variation in synoptic weather systems may affect moist thermodynamics in a way comparable to the temperature variations. As an illustration, we compare numerical solutions to the problem of moist thermal rising in a stratified environment obtained with a fully-compressible acoustic-mode-resolving model and with two versions of the anelastic model, either including or excluding small-scale pressure perturbations in moist thermodynamics. A range of initial temperature perturbations is considered. Model results show that small differences between anelastic and compressible solutions exist only for the largest initial temperature perturbation of 50~K. This paves the way to include pressure perturbations from the elliptic pressure solver in the larger-scale moist problems that will be considered in the future. |
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