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| Titel |
A variational formulation for translation and assimilation of coherent structures |
| VerfasserIn |
M. Plu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 20, no. 5 ; Nr. 20, no. 5 (2013-10-17), S.793-801 |
| Datensatznummer |
250086056
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| Publikation (Nr.) |
 copernicus.org/npg-20-793-2013.pdf |
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| Zusammenfassung |
| The assimilation of observations from teledetected images in geophysical
models requires one to develop algorithms that would account for the
existence of coherent structures. In the context of variational data
assimilation, a method is proposed to allow the background to be translated
so as to fit structure positions deduced from images. Translation occurs as a
first step before assimilating all the observations using a classical
assimilation procedure with specific covariances for the translated
background. A simple validation is proposed using a dynamical system based on
the one-dimensional complex Ginzburg–Landau equation in a regime prone to
phase and amplitude errors. Assimilation of observations after background
translation leads to better scores and a better representation of extremas
than the method without translation. |
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