Experimental insights on the coupling between oceanic internal tides and lee waves

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• Yvan Dossmann, Université de Lorraine, Nancy
• Monday 14 November 2022, 13:00-14:00
• MR5, CMS.

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Usual parameterizations of mixing in global models quantify independently the contribution of internal tides—generated by barotropic flows—and lee waves—generated by quasi-steady flows—relying on a linear approach. However the combined effects of the tidal and quasi-steady flows causes a linear coupling between internal tides and lee waves that has been overlooked in internal wave mixing parameterizations over the last decades.

Laboratory experiments have confirmed the dynamical effects of this linear coupling on internal wave propagation and energy fluxes based on high resolution density measurements with the Light Attenuation Technique (LAT). Moreover, strong nonlinear processes such as the formation of periodic vortices have been measured in the bottom boundary layer. I will present the main results of this experimental campaign and discuss their implications for the parameterization of internal wave induced mixing at the oceanic scale.

This talk is part of the Geophysical and Environmental Processes series.

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