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| Danioux, Eric; Vanneste, J.; Klein, Patrice; Sasaki, H.. |
| The spontaneous generation of inertia-gravity waves (IGWs) by surface-intensified, nearly balanced motion is examined using a high-resolution simulation of the primitive equations in an idealized oceanic configuration. At large scale and mesoscale, the dynamics, which is driven by baroclinic instability near the surface, is balanced and qualitatively well described by the surface quasi-geostrophic model. This however predicts an increase of the Rossby number with decreasing spatial scales and, hence, a breakdown of balance at small scale; the generation of IGWs is a consequence of this breakdown. The wave field is analysed away from the surface, at depths where the associated vertical velocities are of the same order as those associated with the balanced... |
| Tipo: Text |
Palavras-chave: Internal waves; Quasi-geostrophic flows; Wave-turbulence interactions. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00083/19437/17389.pdf |
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