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| Titel |
Applications of Kalman filters based on non-linear functions to numerical weather predictions |
| VerfasserIn |
G. Galanis, P. Louka, P. Katsafados, I. Pytharoulis, G. Kallos |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 24, no. 10 ; Nr. 24, no. 10 (2006-10-20), S.2451-2460 |
| Datensatznummer |
250015642
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| Publikation (Nr.) |
 copernicus.org/angeo-24-2451-2006.pdf |
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| Zusammenfassung |
| This paper investigates the use of non-linear functions in classical Kalman filter
algorithms on the improvement of regional weather forecasts. The main aim is
the implementation of non linear polynomial mappings in a usual linear
Kalman filter in order to simulate better non linear problems in numerical
weather prediction. In addition, the optimal order of the polynomials
applied for such a filter is identified. This work is based on observations
and corresponding numerical weather predictions of two meteorological
parameters characterized by essential differences in their evolution in
time, namely, air temperature and wind speed. It is shown that in both
cases, a polynomial of low order is adequate for eliminating any systematic
error, while higher order functions lead to instabilities in the filtered
results having, at the same time, trivial contribution to the sensitivity of
the filter. It is further demonstrated that the filter is independent of the
time period and the geographic location of application. |
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