Rhomboidal versus triangular spherical harmonic truncation: Some verification statistics |
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| Authors: | Roger Daley Yvon Bourassa |
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| Institution: | Recherche en Prévision Numérique , Service de l'environnement atmosphérique , Dorval, Québec |
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| Abstract: | Abstract In the construction of global primitive equation models, based on the spherical harmonic method, two forms of truncation are in general use. Theoretical considerations suggest the triangular truncation method is superior, but the easily coded rhomboidal truncation is more commonly used. A verification experiment employing the Canadian Operational Spectral Model has been performed to determine if the theoretical superiority of the triangular truncation can be realized in practice. It was found that at least in the restricted case of extra‐tropical forecasts of less than 48 h, that the two truncation methods produced forecasts of equivalent accuracy. |
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| Keywords: | carbon dioxide Holocene Anthropocene early anthropogenic hypothesis pre-industrial agriculture land-use change global carbon cycle |
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