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| Titel |
The impact of periodization methods on the kinetic energy spectra for limited-area numerical weather prediction models |
| VerfasserIn |
V. Blažica, N. Gustafsson, N. Žagar |
| 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. 1 ; Nr. 8, no. 1 (2015-01-23), S.87-97 |
| Datensatznummer |
250116031
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| Publikation (Nr.) |
 copernicus.org/gmd-8-87-2015.pdf |
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| Zusammenfassung |
| The paper deals with the comparison of the most common periodization methods
used to obtain spectral fields of limited-area models for numerical weather
prediction. The focus is on the impact that the methods have on the spectra of the
fields, which are used for verification and tuning of the models.
A simplified model is applied with random fields that obey a known kinetic
energy spectrum. The periodization methods under consideration are
detrending, the discrete cosine transform and the application of an extension
zone. For the extension zone, three versions are applied: the Boyd method, the
ALADIN method and the HIRLAM method. The results show that detrending and the
discrete cosine transform have little impact on the spectra, as does the Boyd
method for extension zone. For the ALADIN and HIRLAM methods, the impact
depends on the width of the extension zone – the wider the zone, the more
artificial energy and the larger impact on the spectra. The width of the
extension zone correlates to the modifications in the shape of the spectra as
well as to the amplitudes of the additional energy in the spectra. |
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