Modelled variability of the sea surface circulation in the North-western Mediterranean Sea and in the Gulf of Lions |
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| Authors: | Gaël André Pierre Garreau Valérie Garnier Philippe Fraunié |
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| Institution: | (1) IFREMER, DEL/AO, BP 70, 29280 Plouzané, France;(2) Rosenstiel School of Marine and Atmospheric Science (RSMAS), 4600 Rickenbaker Causeway, Miami, FL 33149-1098, USA;(3) LSEET-LEPI, Université du Sud Toulon - Var, BP 20132, 83957 La Garde, France |
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| Abstract: | A chain of three nested models, based on the MARS 3D code, is used to simulate the North-western Mediterranean Sea circulation
with a finest grid of 1.2 km resolution and 30 vertical sigma levels. This modelling system allows to resolve the coastal
dynamics taking into account the influence of the general basin circulation. The aim of this study is to assess the ability
of the nested MARS-3D models to reproduce most of the circulation features observed in the North-western Mediterranean Basin
and in the Gulf of Lions. Comparisons of modelled sea surface temperature and salinity with MEDAR/MEDATLAS climatology and
NOAA/AVHRR satellite measurements show that the model accurately reproduces the large and coastal scale variability. Over
the Northern Basin, the seasonal changes of the cyclonic gyre extension are correctly simulated, even though in summer, the
modelled temperature of the surface layer remains in basin-average 1°C cooler than the satellite measured temperature. As
soon as the stratification erodes, modelled and observed temperatures become closer. Over the Gulf of Lions, realistic coastal
responses are obtained under different wind conditions. Upwellings are correctly located and their intensity and spatial extension
were here improved by the use of Aladin wind fields (10 km spatial resolution) and the introduction of a drag coefficient
fitted according to the stability of the planetary boundary layer. The dispersion of fresh Rhone water discharge and the mesoscale
circulation simulated by MARS-3D also agree with satellite measurements. |
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| Keywords: | Northwestern Mediterranean Sea Gulf of Lions MARS-3D NOAA/AVHRR |
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