Correcting surface winds by assimilating high-frequency radar surface currents in the German Bight |
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| Authors: | Alexander Barth Aida Alvera-Azcárate Jean-Marie Beckers Joanna Staneva Emil V Stanev Johannes Schulz-Stellenfleth |
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| Institution: | 1.GeoHydrodynamics and Environment Research (GHER), MARE,Liège,Belgium;2.GKSS Research Centre,Geesthacht,Germany |
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| Abstract: | Surface winds are crucial for accurately modeling the surface circulation in the coastal ocean. In the present work, high-frequency
radar surface currents are assimilated using an ensemble scheme which aims to obtain improved surface winds taking into account
European Centre for Medium-Range Weather Forecasts winds as a first guess and surface current measurements. The objective
of this study is to show that wind forcing can be improved using an approach similar to parameter estimation in ensemble data
assimilation. Like variational assimilation schemes, the method provides an improved wind field based on surface current measurements.
However, the technique does not require an adjoint, and it is thus easier to implement. In addition, it does not rely on a
linearization of the model dynamics. The method is validated directly by comparing the analyzed wind speed to independent
in situ measurements and indirectly by assessing the impact of the corrected winds on model sea surface temperature (SST)
relative to satellite SST. |
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