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Dominique Obaton¹

(1) Mercator-Ocean, France

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Mercator runs currently the global 1/4° system assimilating satellite and in situ data. This best effort system is the main French GODAE contribution. It follows comparison through metrics between several global systems proposed by the experiment as well as its output standards. Moreover, for more than a year now, a regional system has been developed on South Western coast of Europe with the objective to better represent circulation and hydrodynamics on the area and then produce better results used as initial and boundary conditions by French and European coastal modellers. This regional system uses NEMO code with the free surface version; it has now an intermediate horizontal resolution of 1/12°, is forced at its open boundaries by the global system and includes tides. The final system will have a 1/36° resolution and will assimilate data. The talk will describe actual developments of this regional system with focus on open boundary conditions, choices and difficulties encountered, and on implementation of tides.

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