Lateral Boundary Conditions at the staircase-like boundary of ocean models

Eugene Kazantsev 1 Florian Lemarié 1 Eric Blayo 1
1 AIRSEA - Mathematics and computing applied to oceanic and atmospheric flows
Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology, UGA - Université Grenoble Alpes, LJK - Laboratoire Jean Kuntzmann, Inria Grenoble - Rhône-Alpes
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.
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Submitted on : Tuesday, December 13, 2016 - 9:04:27 AM
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Eugene Kazantsev, Florian Lemarié, Eric Blayo. Lateral Boundary Conditions at the staircase-like boundary of ocean models. 6ème Colloque National d'Assimilation de données, Nov 2016, Grenoble, France. ⟨hal-01415345⟩

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