Optimized boundary conditions at staircase-shaped coastlines

Eugene Kazantsev 1, *
* Corresponding author
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 boundary 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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Eugene Kazantsev. Optimized boundary conditions at staircase-shaped coastlines. Ocean Dynamics, Springer Verlag, 2015, 65 (1), pp.49-63. ⟨10.1007/s10236-014-0780-z⟩. ⟨hal-00952847⟩

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