HR: 14:55h
AN: OS43C-06    [Abstracts]
TI: Mixing and Dissipation Caused by Baroclinic Internal Tides: Simulations and Analysis
AU: * Barr, B C
EM: barr@coastal.ufl.edu
AF: University of Florida, Department of Civil and Coastal Engineering 555 Weil Hall, Gainesville, FL 32601 United States
AU: Slinn, D N
EM: slinn@coastal.ufl.edu
AF: University of Florida, Department of Civil and Coastal Engineering 555 Weil Hall, Gainesville, FL 32601 United States
AB: Observations from the Hawaiian Ocean Mixing Experiment (HOME) survey component suggest an increase in diapycnal mixing in a region above a steep slope. Using Large Eddy Simulations (LES), numerical experiments of the frictional benthic boundary layer subjected to baroclinic tidal forcing on a slope are investigated. The baroclinicity includes both depth dependency and phase variation based on HOME data. Previous results have shown the possibility of "off-slope mixing" occurring; potential energy can be released to mixing during phases of down-slope flow in an outer region of the boundary layer, an effect not seen in barotropic flows. Requirements for such mixing are provided. Additionally, parameterizations of both dissipation and mixing based on slope angle, Reynolds number, tidal excursion length, ambient stratification and mean shear are developed for both barotropic and baroclinic flows. Results are compared to observations from HOME and previous parameterizations.
DE: 4211 Benthic boundary layers
DE: 4255 Numerical modeling
DE: 4544 Internal and inertial waves
DE: 4568 Turbulence, diffusion, and mixing processes
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting