“…Our canyon's length (~30 km), width (~8 km at its mouth), vertical extent (>1000 m from mouth to head), aspect ratio (~80º, denoting a relatively narrow canyon), V-shaped geometry (with axial slope near M2 tidal criticality, and steep, supercritical sidewalls), and characteristic barotropic tidal speeds (~0.08 m s -1 )all factors likely to shape the governing physics and intensity of the in-canyon mixing 30,31 are in line with those of many continental-slope canyons in the global ocean 20,21,30 . Second, observational and modelling investigations of nearboundary mixing in a range of oceanic 26,[33][34][35] , limnic 36,37 and idealized geophysical fluid 38,39 settings indicate that the convective process documented here may be of broad generality to oscillatory flows over sloping topography, regardless of the details of the flow or topographic configuration. We can thus surmise that the mechanism of rapid, convectively-induced along-boundary upwelling highlighted by our work is likely to operate elsewhere.…”