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Communication Dans Un Congrès Année : 2002

Experimental study on the mixing induced by inertia-gravity wave breaking on the dynamical barrier of a vortex

Résumé

We present the results of an experimental investigation on the material transport across the shear zone of a cyclonic vortex induced by the breaking of inertia-gravity waves. As has been suggested by McIntyre (1995) this could be a possible mechamism of ozone transport across the dynamical barrier of the polar vortex. The experiments were conducted in a 1 meter size tank containing a rotating stratified fluid. Barotropic vortices were generated by siphoning off fluid with a long perforated tube and per- turbed by planar internal waves generated by the vertical oscillation of a horizontal circular cylinder. As predicted by theorical results based on the WKB approximation, the waves opposing the vortex velocity field were trapped in the outer edge of the vor- tex. In some cases, the increase of wave energy in this region was strong enough to lead to 3-dimensional breaking of the wave pattern. Experimental visualization tech- niques were used to determine the class of instability responsible for this breaking and to measure the induced mixing. A simple model to predict the efficiency of the mixing process will be presented.
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Dates et versions

hal-00206200 , version 1 (16-01-2008)

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Paternité

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  • HAL Id : hal-00206200 , version 1

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F.Y. Moulin, Jan-Bert Flór. Experimental study on the mixing induced by inertia-gravity wave breaking on the dynamical barrier of a vortex. European Geophysical Society. 27 general assembly, Apr 2002, Nice, France. ⟨hal-00206200⟩
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