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Interpolation par assimilation variationnelle de séquences multimodales d’images satellitaires de l’océan ArchiMer
Ba, Sileye O.; Corpetti, Thomas; Chapron, Bertrand; Fablet, Ronan.
In this paper we address the problem of missing data interpolation in multi-modal geophysical satellite observation sequences. Main issues relate to the large percentage of missing data, from 20 % to 90 % for daily high-resolution observations; and the requirement for reconstructing fine-scale structures in accordance with the underlying turbulent dynamics. To solve the missing data interpolation problem, a variational data assimilation model is developped. Using synthetic and real ocean surface observations, numerical and qualitative evaluations demonstrate the relevance of two key components of the proposed model: the fusion of multi-modal observations through a geometric front-driven constraint and the proposed variational assimilation setting using an...
Tipo: Text Palavras-chave: Assimilation variationnelle de données; Interpolation de données manquantes; Inpainting.; Data assimilation; Variational method; Missing data interpolation; Geophysical tracers dynamics; Multimodal interpolation.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00139/24980/23061.pdf
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A 4D-variational approach applied to an eddy-permitting North Atlantic configuration: Synthetic and real data assimilation of altimeter observations ArchiMer
Ferron, Bruno.
The increasing number of oceanic observations calls for the use of synthetic methods to provide consistent analyses of the oceanic variability that will support a better understanding of the underlying mechanisms. In this study, a 1/3 degrees eddy-permitting model of the North Atlantic (from 20 degrees S to 70 degrees N) is combined with a 4D-variational method to estimate the oceanic state from altimeter observations. This resolution allows a better extraction of the physical content of altimeter data since the model spatial scales are more consistent with the data than coarser assimilation exercises because of a lower error in model representativity. Several strategies for the assimilation window are tested through twin experiments carried out under the...
Tipo: Text Palavras-chave: Ocean modelling; Data assimilation; Variational method; Meso-scale; Sea surface height; Heat transport; Meridional overturning.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00044/15534/12956.pdf
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