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    Observations of the transfer of energy and momentum to the oceanic surface boundary layer beneath breaking waves

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    jpo-d-15-0165%2E1.pdf (2.111Mb)
    Date
    2016-06-02
    Author
    Scully, Malcolm E.  Concept link
    Trowbridge, John H.  Concept link
    Fisher, Alexander W.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/8105
    As published
    https://doi.org/10.1175/JPO-D-15-0165.1
    DOI
    10.1175/JPO-D-15-0165.1
    Keyword
     Circulation/ Dynamics; Energy transport; Mixing; Momentum; Turbulence; Wave breaking; Waves, oceanic 
    Abstract
    Measurements just beneath the ocean surface demonstrate that the primary mechanism by which energy from breaking waves is transmitted into the water column is through the work done by the covariance of turbulent pressure and velocity fluctuations. The convergence in the vertical transport of turbulent kinetic energy (TKE) balances the dissipation rate of TKE at first order and is nearly an order of magnitude greater than the sum of the integrated Eulerian and Stokes shear production. The measured TKE transport is consistent with a simple conceptual model that assumes roughly half of the surface flux of TKE by wave breaking is transmitted to depths greater than the significant wave height. During conditions when breaking waves are inferred, the direction of momentum flux is more aligned with the direction of wave propagation than with the wind direction. Both the energy and momentum fluxes occur at frequencies much lower than the wave band, consistent with the time scales associated with wave breaking. The largest instantaneous values of momentum flux are associated with strong downward vertical velocity perturbations, in contrast to the pressure work, which is associated with strong drops in pressure and upward vertical velocity perturbations.
    Description
    Author Posting. © American Meteorological Society, 2016. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 46 (2016): 1823-1837, doi:10.1175/JPO-D-15-0165.1.
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    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of Physical Oceanography 46 (2016): 1823-1837
     

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