Optimal boundary conditions for ORCA-2 model
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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.
KeywordsVariational data assimilation Boundary conditions ORCA-2 model
The author would like to express his gratitude to Arthur Vidard for providing the ORCA-2 configuration of the NEMO accompanied by forcings and observational data and to Igor Gejadze from for his helpful comments and suggestions.
All the contour pictures have been prepared by the Grid Analysis and Display System (GrADS) developed in the Center for Ocean–Land–Atmosphere Interactions, Department of Meteorology, University of Maryland.
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