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| ====== ANR STATOCEAN ====== | ====== ANR STATOCEAN ====== | ||
| + | {{:recherche:projets:kuroshio_current.jpg?&200 |}}**Out of equilibrium statistical mechanics of geophysical flows and applications to the Kuroshio current (east of Japan) and to the Zapiola anticyclone (east of Argentina)** | ||
| - | **Out of equilibrium statistical mechanics of geophysical flows and applications to the Kuroshio current (east of Japan) and to the Zapiola anticyclone (east of Argentina)** | + | **Directed by: Freddy BOUCHET, ENS-Lyon and CNRS** \\ |
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| - | {{:science:projets:kuroshio_current.jpg?nolink&300 |}}**Directed by: Freddy BOUCHET, ENS-Lyon and CNRS** \\ | + | |
| Contact: Freddy Bouchet \\ | Contact: Freddy Bouchet \\ | ||
| Freddy.Bouchet [at] ens-lyon.fr \\ | Freddy.Bouchet [at] ens-lyon.fr \\ | ||
| Funded by ANR-STATOCEAN \\ | Funded by ANR-STATOCEAN \\ | ||
| [[http://perso.ens-lyon.fr/freddy.bouchet/STATOCEAN/Statocean.html|STATOCEAN Website]] \\ | [[http://perso.ens-lyon.fr/freddy.bouchet/STATOCEAN/Statocean.html|STATOCEAN Website]] \\ | ||
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| Members of the group: | Members of the group: | ||
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| We will study several important phenomena for the large scale dynamics of oceans ; on one hand the bistability of some of the western boundary currents like the Gulf Stream, but especially of the Kuroshio current (east of Japan), and on the other hand the self-organized Zapiola ocean anticyclone, east of Argentina. Our choice of these examples has been dictated by their importance for ocean circulation, but also for their paradigmatic interest as far as statistical mechanics is concerned. Indeed, the Kuroshio exhibits a bistability that we will explain by the vicinity of an out of equilibrium phase transition. The Zapiola is one of the clearest examples of self organization close to some equilibrium states, even out of equilibrium. Then these two problems will be essential for illustrating the relevance of statistical mechanics tools for ocean dynamics but also for other types of geophysical fluid dynamics problems. | We will study several important phenomena for the large scale dynamics of oceans ; on one hand the bistability of some of the western boundary currents like the Gulf Stream, but especially of the Kuroshio current (east of Japan), and on the other hand the self-organized Zapiola ocean anticyclone, east of Argentina. Our choice of these examples has been dictated by their importance for ocean circulation, but also for their paradigmatic interest as far as statistical mechanics is concerned. Indeed, the Kuroshio exhibits a bistability that we will explain by the vicinity of an out of equilibrium phase transition. The Zapiola is one of the clearest examples of self organization close to some equilibrium states, even out of equilibrium. Then these two problems will be essential for illustrating the relevance of statistical mechanics tools for ocean dynamics but also for other types of geophysical fluid dynamics problems. | ||
| - | {{ :science:projets:rings-southern-ocean-high-resolution.jpg?nolink&400 |}} \\ | + | {{ :science:projets:rings-southern-ocean-high-resolution.jpg?&400 |}} \\ |
| //[From Hallberg-Gnanadesikan - JPO 2006.] A large part of ocean mesoscale variability is explained by vortices (rings) of size 100 - 200 km. These rings are present everywhere in the ocean. There are for instance visible here south of South Africa and all along the Antarctic circumpolar current.// | //[From Hallberg-Gnanadesikan - JPO 2006.] A large part of ocean mesoscale variability is explained by vortices (rings) of size 100 - 200 km. These rings are present everywhere in the ocean. There are for instance visible here south of South Africa and all along the Antarctic circumpolar current.// | ||
| - | {{ :science:projets:rings-psi-vitesse.jpg?nolink&400 |}} | + | {{ :science:projets:rings-psi-vitesse.jpg?&400 |}} |
| //Streamfunction and velocity statistical equilibria, explaining the structure and drift velocity of ocean rings.// | //Streamfunction and velocity statistical equilibria, explaining the structure and drift velocity of ocean rings.// | ||
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| Our approach is thus complementary and not opposed to the more traditional fluid dynamics and nonlinear dynamics developed earlier by oceanographers. A non negligible part of the project is experimental. It aims at reproducing in the lab the type of bistability that characterizes the Kuroshio current, thanks to indications that will be provided by statistical mechanics. | Our approach is thus complementary and not opposed to the more traditional fluid dynamics and nonlinear dynamics developed earlier by oceanographers. A non negligible part of the project is experimental. It aims at reproducing in the lab the type of bistability that characterizes the Kuroshio current, thanks to indications that will be provided by statistical mechanics. | ||
| + | ===== CBP contribution to the project ===== | ||
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| + | CBP hosted STATOCEAN members for two years and provided a very pleasant and friendly framework. CBP also allowed very interesting discussions concerning tools and numerical methods. | ||
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| + | CBP also provided the administrative and logistical support for scientific meetings and for the specific workshop: "Computation of transition trajectories and rare events in non-equilibrium systems - Applications in Turbulence, Chemistry, (Bio)Physics". | ||