Journal
JOURNAL OF PHYSICAL OCEANOGRAPHY
Volume 46, Issue 6, Pages 1823-1837Publisher
AMER METEOROLOGICAL SOC
DOI: 10.1175/JPO-D-15-0165.1
Keywords
Circulation; Dynamics; Energy transport; Mixing; Momentum; Turbulence; Wave breaking; Waves; oceanic
Categories
Funding
- National Science Foundation [OCE-1339032, OCE-1338518]
- Directorate For Geosciences
- Division Of Ocean Sciences [1338518] Funding Source: National Science Foundation
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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.
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