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Air-Sea interactions: a dissipation mechanism for oceanic internal waves ?

11 mai 2023 @ 14h00 - 17h00

– Audrey Delpech, Postdoc à UCLA, Los Angeles, USA –

 

Résumé :

The global overturning circulation of the ocean and the vertical transport of heat and dissolved gases that regulate the climate are largely controlled by oceanic diapycnal mixing. Diapycnal mixing is primarily driven by the breaking of internal waves that propagate throughout the oceans at near-inertial and tidal frequencies. Understanding the lifecycle of internal waves from their generation to their dissipation is therefore an important key for improving the representation of ocean mixing in climate models. In this study, we provide a first evidence, from a regional numerical simulation in the northeastern Pacific, that the interaction between the ocean and the atmosphere can play an important role in damping internal waves through wind-current feedback mechanism. Taking into account these interactions generates a reduction of 67% of near‐inertial internal waves and provides a net energy sink of 0.2 mW.m2 for tidal internal waves, corresponding to 8% of the local generation in the region of study. The seasonal variability and modal distribution of this energy sink are also investigated as well as its potential implication for the energy budget of the ocean.

 

Lien Zoom :

https://cnrs.zoom.us/j/95809633244?pwd=RElXZlUxcy96K05kRjlxa011OFNSUT09

ID de réunion : 958 0963 3244

Code secret : vFkva7

Détails

Date :
11 mai 2023
Heure :
14h00 - 17h00
Catégories d’Évènement:
,

Organisateur

LEGOS

Lieu

Jules Verne

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