# Boundary conditions control in ORCA2

* Corresponding author
1 MOISE - Modelling, Observations, Identification for Environmental Sciences
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology
Abstract : A 4D-Var data assimilation technique is applied to ORCA-2 configuration of the NEMO in order to identify the optimal parametrization of boundary conditions on the lateral boundaries as well as on the bottom and on the surface of the ocean. The influence of boundary conditions on the solution is analyzed both within and beyond the assimilation window. It is shown that the optimal bottom and surface boundary conditions allow us to better represent the jet streams, such as Gulf Stream and Kuroshio. Analyzing the reasons of the jets reinforcement, we notice that data assimilation has a major impact on parametrization of the bottom boundary conditions for $u$ and $v$. Automatic generation of the tangent and adjoint codes is also discussed. Tapenade software is shown to be able to produce the adjoint code that can be used after a memory usage optimization.
Document type :
Conference papers

https://hal.inria.fr/hal-00925863
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Submitted on : Wednesday, January 8, 2014 - 4:51:52 PM
Last modification on : Tuesday, October 19, 2021 - 11:12:55 PM
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orca-paris.pdf
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• HAL Id : hal-00925863, version 1

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### Citation

Eugene Kazantsev. Boundary conditions control in ORCA2. Journée thématique - Que peuvent attendre les modélisateurs de l'assimilation ?, Action MANU du programme LEFE, Feb 2013, Paris, France. ⟨hal-00925863⟩

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