Geodesic
Ocean jet instability: a model comparison
Jean-Michel Baey1 ; Pascal Rivière1 ; Xavier Carton1
1 EPSHOM/CMO, Brest, 29275, France
ESAIM. Proceedings, Tome 7 (1999), pp. 12-23.

Voir la notice de l'article provenant de la source EDP Sciences

We investigate numerically the instability of three jets of the North Atlantic ocean (the Gulf-Stream, the North Atlantic current and the Azores current), and the vortices resulting from this instability. For this problem, we compare two hydrodynamical models (the shallow-water and the quasi-geostrophic equations) which we implement in identical conditions (two-layer stratification). First, both models are linearized and growth rates are calculated for zonal, normal-mode perturbations on such jets. When we vary the Burger and the Rossby numbers of the jets and the wavenumber of the perturbations, the two linear models yield fairly similar results. Secondly, both nonlinear models (discretized on a fixed regular grid) are used to compute the finite-amplitude evolutions of the perturbed jets. These evolutions are qualitatively similar in both models, but the dynamical features (jet and vortices) are longer-lived in the shallow-water than in the quasi-geostrophic model. Also, only the former model exhibits an asymmetry between cyclones and anticyclones, which is physically explained.
DOI : 10.1051/proc:1999002

Jean-Michel Baey 1 ; Pascal Rivière 1 ; Xavier Carton 1

1 EPSHOM/CMO, Brest, 29275, France 
@article{EP_1999_7_a1,
     author = {Jean-Michel Baey and Pascal Rivi\`ere and Xavier Carton},
     title = {Ocean jet instability: a model comparison},
     journal = {ESAIM. Proceedings},
     pages = {12--23},
     publisher = {mathdoc},
     volume = {7},
     year = {1999},
     doi = {10.1051/proc:1999002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1051/proc:1999002/}
}
TY  - JOUR
AU  - Jean-Michel Baey
AU  - Pascal Rivière
AU  - Xavier Carton
TI  - Ocean jet instability: a model comparison
JO  - ESAIM. Proceedings
PY  - 1999
SP  - 12
EP  - 23
VL  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.1051/proc:1999002/
DO  - 10.1051/proc:1999002
LA  - en
ID  - EP_1999_7_a1
ER  - 
%0 Journal Article
%A Jean-Michel Baey
%A Pascal Rivière
%A Xavier Carton
%T Ocean jet instability: a model comparison
%J ESAIM. Proceedings
%D 1999
%P 12-23
%V 7
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.1051/proc:1999002/
%R 10.1051/proc:1999002
%G en
%F EP_1999_7_a1
Jean-Michel Baey; Pascal Rivière; Xavier Carton. Ocean jet instability: a model comparison. ESAIM. Proceedings, Tome 7 (1999), pp. 12-23. doi : 10.1051/proc:1999002. http://geodesic.mathdoc.fr/articles/10.1051/proc:1999002/

Cité par Sources :