This work is a contribution to the LEFE/IDAO VOASSI program funded by CNRS. The authors thank two anonymous reviewers for their constructive comments, as well as Jérôme Vialard, Claude Kergomard, and Mathieu Rouault for helpful discussions. ERA-40 data used in this study have been freely obtained from the ECMWF data server. Calculations were performed using high-performance computing (HPC) resources from DSI-CCUB, Université de Bourgogne.
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