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SIMULATIONS OF OCEAN MIXED LAYERS WITHSTOCHASTIC SURFACE FORCING
PETER SULLIVAN
NATIONAL CENTER FOR ATMOSPHERIC RESEARCH
Collaborators:
James McWilliams (UCLA)
Ken Melville (SIO)
``… At wind speeds above about 8m/s, momentum isbelieved to be transferred between air and waterprincipally through waves and not by viscous drag onthe surface.
… Momentum and kinetic energy is delivered to theunderlying water through the intermediary of wavesamplified and dissipated locally…”
Mark Donelan (1998)
WINDS TO WAVES TO CURRENTS
Hurricane Isabel CBLAST Photo courtesy M.Hurricane Isabel CBLAST Photo courtesy M.Montgomery (CSU)Montgomery (CSU)
HIGH WIND SURFACE DYNAMICSHIGH WIND SURFACE DYNAMICSWAVE BREAKING AND LANGMUIR CIRCULATIONSWAVE BREAKING AND LANGMUIR CIRCULATIONS
Great Salt Lake Photo courtesy S. Great Salt Lake Photo courtesy S. MonismithMonismith(Stanford)(Stanford)
Intermittent fluxes of momentumand energy
Wave-averaged effects
PDF OF BREAKING FOR VARYING WIND SPEED
( .. ) - Stokes terms
( .. ) - Breaker terms
Momentum
SGS e
Density
LES OF OCEAN PBL WITH WAVE EFFECTSPARTICLE PATHS
PARTICLE PATHS OVERLAYING VORTICITY CONTOURS
STOCHASTIC LES WITH WAVE BREAKING:W VISUALIZATION IN Z PLANES AND 3D STRUCTURES
Ring vortices
Wave energyWind input
Non-linear waveinteractions
Dissipation fromwave breaking
Before Bonnie
After Bonnie... .
... ..
SST Variations& Ocean Mixing
Shuyi Chen, RSMAS
LANGMUIRCIRCULATIONS
GREAT SALT LAKE
COURTESY S.MONISMITH
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