Rapid generation of high-frequency internal waves beneath a wind and wave forced oceanic surface mixed layer

Details Rapid generation of high-frequency internal waves beneath a wind and wave forced oceanic surface mixed layer Rapid generation of high-frequency internal waves beneath a wind and wave forced oceanic surface mixed layer

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3513602p&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 13, CiteID L13602

Physics

9

Oceanography: Physical: Internal And Inertial Waves, Oceanography: Physical: Surface Waves And Tides (1222), Oceanography: Physical: Hydrodynamic Modeling, Oceanography: Physical: Upper Ocean And Mixed Layer Processes, Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes (4490)

Scientific paper

High-frequency internal waves generated by Langmuir motions over stratified water may be an important source of turbulent mixing below the surface mixed layer. Large eddy simulations of a developing mixed layer and inertial current are employed to investigate this phenomena. Uniform surface wind stress and parallel Stokes drift wave forcing rapidly establishes a turbulent mixed-layer flow, which (as the inertial motion veers off the wind) generates high-frequency internal waves in the stratified fluid below. The internal waves evolve such that their vector phase velocity matches the depth-averaged mixed-layer velocity that rotates as an inertial oscillation. The internal waves drain energy and momentum from the mixed layer on decay time-scales that are comparable to those of near-inertial oscillations. The high-frequency waves, which are likely to be trapped in the transition layer, may significantly contribute to mixing there and thus provide a potentially important energy sink for mixed-layer inertial motions.

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