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| Titel |
Two adaptive radiative transfer schemes for numerical weather prediction models |
| VerfasserIn |
V. Venema, A. Schomburg, F. Ament, C. Simmer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 7, no. 21 ; Nr. 7, no. 21 (2007-11-15), S.5659-5674 |
| Datensatznummer |
250005252
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| Publikation (Nr.) |
 copernicus.org/acp-7-5659-2007.pdf |
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| Zusammenfassung |
| Radiative transfer calculations in atmospheric models are computationally
expensive, even if based on simplifications such as the δ-two-stream
approximation. In most weather prediction models these parameterisation
schemes are therefore called infrequently, accepting additional model error
due to the persistence assumption between calls. This paper presents two
so-called adaptive parameterisation schemes for radiative transfer in a
limited area model: A perturbation scheme that exploits temporal
correlations and a local-search scheme that mainly takes advantage of
spatial correlations. Utilising these correlations and with similar
computational resources, the schemes are able to predict the surface net
radiative fluxes more accurately than a scheme based on the persistence
assumption. An important property of these adaptive schemes is that their
accuracy does not decrease much in case of strong reductions in the number
of calls to the δ-two-stream scheme. It is hypothesised that the
core idea can also be employed in parameterisation schemes for other
processes and in other dynamical models. |
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