Analysis of the numerics of physics–dynamics coupling

Medientyp: E-Artikel
Titel: Analysis of the numerics of physics–dynamics coupling
Beteiligte: Staniforth, Andrew; Wood, Nigel; Côté, Jean
Erschienen: Wiley, 2002
Erschienen in: Quarterly Journal of the Royal Meteorological Society, 128 (2002) 586, Seite 2779-2799
Sprache: Englisch
DOI: 10.1256/qj.02.25
ISSN: 0035-9009; 1477-870X
Schlagwörter: Atmospheric Science
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Beschreibung: AbstractA methodology for analysing the numerical properties of schemes for coupling physics parametrizations to a dynamical core is presented. As an example of its application, the methodology is used to study four coupling schemes (‘explicit’, ‘implicit’, ‘split‐implicit’ and ‘symmetrized split‐implicit’) in the context of a semi‐implicit semi‐Lagrangian dynamical core. Each coupling scheme is assessed in terms of its numerical stability and of the accuracy of both its transient and steady‐state responses. Additionally, the occurrence of spurious, computational resonance is analysed and discussed. It is found that in this respect all four schemes behave similarly. In particular, in the absence of any damping mechanism to control resonance, the time‐step restriction needed to avoid spurious resonance is twice as restrictive for time‐dependent forcing as for stationary forcing. © Crown Copyright, 2002.
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