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| Titel |
A semi-Lagrangian advection scheme for radioactive tracers in the NCEP Regional Spectral Model (RSM) |
| VerfasserIn |
E.-C. Chang, K. Yoshimura |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 8, no. 10 ; Nr. 8, no. 10 (2015-10-14), S.3247-3255 |
| Datensatznummer |
250116605
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| Publikation (Nr.) |
 copernicus.org/gmd-8-3247-2015.pdf |
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| Zusammenfassung |
| In this study, the non-iteration dimensional-split semi-Lagrangian (NDSL)
advection scheme is applied to the National Centers for Environmental
Prediction (NCEP) Regional Spectral Model (RSM) to alleviate the Gibbs
phenomenon. The Gibbs phenomenon is a problem wherein negative values of
positive-definite quantities (e.g., moisture and tracers) are generated by
the spectral space transformation in a spectral model system. To solve this
problem, the spectral prognostic specific humidity and radioactive tracer
advection scheme is replaced by the NDSL advection scheme, which considers
advection of tracers in a grid system without spectral space
transformations. A regional version of the NDSL is developed in this study
and is applied to the RSM. Idealized experiments show that the regional
version of the NDSL is successful. The model runs for an actual case study
suggest that the NDSL can successfully advect radioactive tracers
(iodine-131 and cesium-137) without noise from the Gibbs phenomenon. The
NDSL can also remove negative specific humidity values produced in spectral
calculations without losing detailed features. |
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