Note on the redistribution and dissipation of tidal energy over mid-ocean ridges

Xinfeng Liang, Carl Wunsch
2015 Tellus: Series A, Dynamic Meteorology and Oceanography  
A B S T R A C T The redistribution and dissipation of internal wave energy arising from the conversion at mid-ocean ridges of the barotropic tide is studied in a set of numerical experiments. A two-dimensional non-hydrostatic model with 100 m horizontal and 10Á25 m vertical resolution is used to represent the detailed processes near an idealised ridge. Conventional internal wave beams at the tidal frequency, x M 2 , appear. At the ridge crest, strong tidal energy dissipation occurs that both
more » ... occurs that both mixes the fluid and generates strong near-inertial oscillations radiating in near-horizontal beams. Resonant triad interaction between the tidal and inertial motions in turn produces beams at x M 2 À f ; and with high shear, thus effectively mixing fluid at considerable heights above the ridge crest.
doi:10.3402/tellusa.v67.27385 fatcat:voejtwyd5fbgvic3vqjjklb55m