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Impact of ASAR ENVISAT directional wave spectra on wave forecast

In order to improve the wave forecast, the assimilation of directional wave spectra in wave model has been developed at Meteo France. The assimilation scheme is tested for real ENVISAT ASAR wave spectra provided by the European Space Agency. The scheme takes into account the limitation in frequency related to the ASAR instrument. The preliminary results show that the assimilation of wave spectra is efficient and works correctly. The impact of the assimilation on wave parameters is significant and stays effective in the forecast period. In addition, statistical analysis has shown good skill in term of root mean square and assimilation index for the analyzed wave parameters (wave height, direction and frequency).