Author(s)

C. Shn&ani, P. Daniel

Abstract

Atmospheric forcing impact study in MOTHY oil drift model C. Skandrani', P. Daniel* ^Cedre, France * Meteo-France, DP/PREVI/MAR, France Abstract Meteo-France has developed a numerical marine oil pollution transport model, named MOTHY, designed to simulate the transport of oil in three dimensions. A hydrodynamic ocean model is linked to an oil spill model including current shear, vertical movements and fate of the oil. In case of marine pollution, Meteo- France send meteorological forecasts and pollutant drift forecasts to the authorities in charge of pollution fighting. This response system has been operational since 1994. About ten interventions per year have been conducted in real time. In the paper, we study the impact of wind interpolation on the drift of pollutants. Wind is interpolated from the atmospheric model grid to the ocean model grid. A comparison of two interpolation methods is investigated on both theorical and numerical cases of pollution drift. One method is an in

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