High-resolution atmospheric forcing for regional oceanic model: the Iroise Sea |
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| Authors: | Héloïse Muller Franck Dumas Bruno Blanke Vincent Mariette |
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| Institution: | (1) Laboratoire de Physique des Océans (LPO)/University of Western Brittany, UMR 6523 CNRS/IFREMER/UBO, UFR Sciences et Techniques, 6 Avenue Le Gorgeu, BP 809, 29285 Brest Cedex, France;(2) IFREMER/DYNECO-PHYSED, BP70, 29280 Plouzane France Cedex, France;(3) ACTIMAR, 24 Quai de la Douane, 29200 Brest Cedex, France |
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| Abstract: | This study was aimed at modeling, as realistically as possible, the dynamics and thermodynamics of the Iroise Sea by using
the Model for Applications at Regional Scale (MARS), a regional ocean 3D model. The horizontal resolution of the configuration
in use is 2 km with 30 vertical levels. The 3D model of the Iroise Sea is embedded in a larger model providing open boundary
conditions. As regards the atmospheric forcing, the originality of this study is to force the regional ocean model with the
high-resolution (6 km) regional meteorological model, Weather Research and Forecasting (WRF). In addition, as the air surface
temperature is highly sensitive to the sea surface temperature (SST), this regional meteorological model is improved by taking
into account a regional climatologic SST to compute meteorological parameters. By allowing a better coherence between the
SST and the temperature of the atmospheric boundary layer while giving a more realistic representation of heat fluxes exchanged
at the air/sea interface, this forcing constitutes a noticeable improvement of the Iroise Sea modeling. The different sensitivity
tests discussed here pinpoint the importance of entering, in WRF, SST data of sufficiently high quality before the computation
of meteorological forcing when the aim is a study of dynamics and thermodynamics far away from the coast. On the other hand,
when the target is the reproduction of coastal small-scale features in Iroise Sea modeling, the resolution of the meteorological
forcing and the quality of SST are both paramount. The simulation of reference was carried out throughout the Summer and Autumn
of year 2005 to allow comparisons with a campaign of surface current measurements by high-frequency radars conducted at the
same period. |
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| Keywords: | Iroise Sea MARS WRF High-frequency radar data |
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