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Tidally driven mixing and dissipation in the stratified boundary layer above steep submarine topography
Author(s) -
Winters K. B.
Publication year - 2015
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2015gl064676
Subject(s) - geology , boundary layer , thermal diffusivity , dissipation , submarine canyon , canyon , mixing (physics) , stratified flow , plume , stratified flows , mechanics , turbulence , meteorology , geomorphology , physics , thermodynamics , quantum mechanics
A tidally driven, stratified boundary layer over supercritical topography is simulated numerically. The near‐boundary flow is characterized by quasiperiodic, bore‐like motions and episodic expulsion events where fluid is ejected into the stratified interior. The character of the bores is compared to the high‐resolution ocean mooring data of van Haren (2006). The diffusivity of the flow near the boundary is estimated by means of a synthetic dye tracer experiment. The average dissipation rate within the dye cloud is computed and combined with the diffusivity estimate to yield an overall mixing efficiency of 0.15. Both the estimated diffusivity and dissipation rates are in reasonable agreement with the microstructure observations of Kunze et al. (2012) when scaled to the environmental conditions at the Monterey and Soquel Canyons and to the values estimated by van Haren and Gostiaux (2012) above the sloping bottom of the Great Meteor Seamount in the Canary Basin.