Interaction between fast tides and convection

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• Caroline Terquem (University of Oxford)
• Tuesday 16 January 2024, 14:30-15:15
• Seminar Room 1, Newton Institute.

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ADIW01 - Layering — A structure formation mechanism in oceans, atmospheres, active fluids and plasmas

All the studies of the interaction between tides and a convective flow assume that the large-scale tides can be described as a mean shear flow that is damped by small-scale fluctuating convective eddies. The convective Reynolds stress is calculated using mixing length theory, accounting for a sharp suppression of dissipation when the turnover time-scale is larger than the tidal period. This yields tidal dissipation rates several orders of magnitude too small to account for observations. We have recently argued that the above description is inconsistent, and that the standard picture should be reversed, with the fluctuations being the tidal oscillations and the mean shear flow provided by the largest convective eddies.  This yields an energy exchange rate between the oscillation and  the convective flow that couples the Reynolds stress of the oscillation with the convective velocity gradient.  Assuming local dissipation of the tides, this new formalism gives good agreement with observations.  However, so far, the formalism does not rule out the possibility that the tides extract energy from convection, instead of being dissipated. 

This talk is part of the Isaac Newton Institute Seminar Series series.

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