Sur l'assimilation variationnelle de données par un modèle d'écosystème marin de type NPZ |
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| Authors: | Yann Leredde Christine Lauer-Leredde Frédéric Diaz |
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| Institution: | 1. Laboratoire de dynamique de la lithosphère, université Montpellier-2, place Eugène-Bataillon, 34095 Montpellier cedex 5, France;2. Laboratoire d''océanographie et de biogéochimie, centre d''océanologie de Marseille, université de la Méditerranée, campus de Luminy, case 901, 13288 Marseille cedex 9, France |
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| Abstract: | A variational data assimilation method is applied to a simplified marine ecosystem model of NPZ (Nutrient Phytoplankton Zooplankton) type, which implies five parameters. The method allows us to optimise these parameters by an iterative process of minimisation of a cost function which quantifies the quadratic discrepancy between observations and simulation results. The first part of this note describes how to obtain the adjoint model of the NPZ model allowing us to compute the gradient of the cost function relative to the parameters. Two experiments of artificial data assimilation then show the efficiency of this method, but also its limitations because of non-linearities and sensitivity problems of the model relative to the parameters. To cite this article: Y. Leredde et al., C. R. Geoscience 337 (2005). |
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| Keywords: | Contrôle optimal Modèle NPZ Écosystème marin Identification de paramètres Modèle adjoint Optimal control NPZ model Marine ecosystem Identification of parameters Adjoint model |
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