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| Muller, Heloise; Blanke, Bruno; Dumas, Franck; Mariette, Vincent. |
| This paper describes the surface Lagrangian residual circulation (LRC) over 2.5 day intervals in the Iroise Sea, west of France, and evaluates, for operational purposes, the influence of the different physical mechanisms that govern it. The method consists of the calculation of water displacements with a diagnostic Lagrangian tool that computes the trajectories of numerical particles in a given velocity field. The LRC is inferred from trajectories integrated over five M2 tidal cycles. The analysis is applied to both gridded genuine current measurements and ocean model outputs: the sea surface currents are derived from high-frequency (HF) radar measurements and from MARS, a 3-D regional ocean model used here in idealized configurations. To substantiate the... |
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| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00011/12220/9004.pdf |
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| Muller, Heloise; Blanke, Bruno; Dumas, Franck; Lekien, Francois; Mariette, Vincent. |
| In this study, the Lagrangian residual circulation in the Iroise Sea is estimated by a numerical method where the trajectories of the particles released in any given velocity field are calculated by a diagnostic tool. From their knowledge, the residual Lagrangian currents are computed over a whole number of M2 tidal cycles. The Lagrangian residual circulation is mapped from sea surface currents measured by HF radars and from the surface currents computed with the Model for Applications at Regional Scales (MARS), a regional 3D ocean model forced, here, by the Weather Research and Forecasting (WRF) regional meteorological model. In order to overcome inconvenient space- and time-variations in radar coverage, the measured radar data are interpolated,... |
| Tipo: Text |
Palavras-chave: High frequency radar data; Regional ocean modeling; Lagrangian residual circulation; Iroise Sea. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-7324.pdf |
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| Muller, Heloise; Dumas, Franck; Blanke, Bruno; Mariette, Vincent. |
| 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... |
| Tipo: Text |
Palavras-chave: High frequency radar data; WRF; MARS; Iroise Sea. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3518.pdf |
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| Mariette, Vincent. |
| Dans nos régions (Nord Est Atlantique), la structure thermique de la couche superficielle de l'océan qui concerne les premières dizaines de mètres, évolue suivant un cycle saisonnier. Alors qu'en hiver on observe une homogénéité verticale en température, avec le printemps commence la formation d'une structure thermique caractérisée par l'existence d'un gradient thermique bien marqué situé entre 10 m et 60 m de profondeur et surmonté d'une couche homogène en température. Ce gradient thermique, appelé thermocline, se forme au moment où la mer commence à gagner de la chaleur et résulte de la succession de périodes ensoleillées (plus nombreuses) et de vents forts. Ce profil thermique subsiste jusqu'en automne et disparaît sous l'effet des forts coups de vent... |
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| Ano: 1983 |
URL: http://archimer.ifremer.fr/doc/00106/21677/19256.pdf |
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