Estimating tidally driven mixing in the deep ocean

Details Estimating tidally driven mixing in the deep ocean Estimating tidally driven mixing in the deep ocean

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29w..21s&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 23, pp. 21-1, CiteID 2106, DOI 10.1029/2002GL015633

Physics

34

Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes, Oceanography: Physical: Internal And Inertial Waves, Oceanography: Physical: Fine Structure And Microstructure

Scientific paper

Using a parameterization for internal wave energy flux in a hydrodynamic model for the tides, we estimate the global distribution of tidal energy available for enhanced turbulent mixing. A relation for the diffusivity of vertical mixing is formulated for regions where internal tides dissipate their energy as turbulence. We assume that 30 +/- 10% of the internal tide energy flux dissipates as turbulence near the site of generation, consistent with an estimate based on microstructure observations from a mid-ocean ridge site. Enhanced levels of mixing are modeled to decay away from topography, in a manner consistent with these observations. Parameterized diffusivities are shown to resemble observed abyssal mixing rates, with estimated uncertainties comparable to standard errors associated with budget and microstructure methods.

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