Reduced order approaches for variational data assimilation in oceanography

Eric Blayo 1
1 MOISE - Modelling, Observations, Identification for Environmental Sciences
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, INPG - Institut National Polytechnique de Grenoble
Abstract : A reduced order approach for 4D-Var data assimilation is presented in the context of a tropical Pacific ocean model. The control space is defined as the span of a few vectors representing a significant part of the system variability, while the model itself is not reduced. It is shown that such an approach can lead to significant improvements, both in terms of the quality of the solution and of the computational efficiency, with regard to data assimilation with a full control vector. However several limitations of the approach will also be discussed, as well as a first step towards an hybrid variational-sequential algorithm.
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Conference papers
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https://hal.inria.fr/inria-00344504
Contributor : Eric Blayo <>
Submitted on : Thursday, December 4, 2008 - 10:43:16 PM
Last modification on : Wednesday, April 11, 2018 - 1:59:31 AM

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Eric Blayo. Reduced order approaches for variational data assimilation in oceanography. Workshop on Industrial applications of low order model based on POD, Mar 2008, Bordeaux, France. ⟨inria-00344504⟩

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