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Jeudi 14 Novembre - Deep-ocean internal tides: observations, theory and towards a parametrisation of mixing

Par SEMSOU Dernière modification 11/10/2019 17:49
Quand ? Le 14/11/2019,
de 14:00 à 15:00
Où ? salle Lyot
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Clément Vic

Laboratoire d'Océanographie Physique et Spatiale (LOPS), Brest

 

Title : Deep-ocean internal tides: observations, theory and towards a parametrisation of mixing

 

Abstract : Turbulent mixing in the ocean is key to regulate the transport of heat, freshwater and biogeochemical tracers, with strong implications for Earth’s climate. In the deep ocean, tides supply much of the mechanical energy required to sustain mixing via the generation of internal waves at tidal frequencies, called internal tides, whose fate — the relative importance of their local versus remote breaking — remains uncertain. In this presentation, I will start by reviewing our current knowledge of tidal energetics in the deep ocean, i.e., excluding continental shelves. Then, I will present some observationally-based evidence for the generation of high-mode, i.e., small-scale, internal tides over mid-ocean ridges, supported by revisited theories of tidal energy conversion. Impacts for local mixing will be discussed. Finally, I will open up towards some work in progress, seeking to build an energetically-consistent parametrisation of tidally-driven mixing.

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