Lateral Boundary Conditions at the staircase-like boundary of ocean modelsReport as inadecuate




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1 AIRSEA - Mathematics and computing applied to oceanic and atmospheric flows Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, UJF - Université Joseph Fourier - Grenoble 1, INPG - Institut National Polytechnique de Grenoble

Abstract : A 4D-Var data assimilation technique is applied to a rectangular-box configuration of the NEMO in order to analyze the optimal parametrization of boun\-dary conditions at lateral boundaries. The impact of staircase-shaped coastlines is studied by rotating the model grid around the center of the box. Rotations on $30^\circ$ and $45^\circ$ are studied with single and double gyre forcing patterns. It is shown that optimized boundary conditions compensate the errors induced by the staircase-like approximation of the coastline.

Keywords : Variational Data Assimilation Boundary conditions NEMO model.





Author: Eugene Kazantsev - Florian Lemarié - Éric Blayo -

Source: https://hal.archives-ouvertes.fr/



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