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IZVESTIYA ATMOSPHERIC AND OCEANIC PHYSICS

ISSN:0001-4338
eSSN:1555-628X

2021

10.1134/S0001433821050054

The upper boundary layer of the sea is most affected by the atmosphere, and the motions formed there have a significant influence on the horizontal and vertical fluxes of heat, momentum, and other substances. The vertical turbulent exchange in this layer is determined by the action of several mechanisms at once, one of which is the surface wave. Estimates of the contribution of a wave to the overall generation of turbulence have been made by many researchers using a variety of approaches. To verify the proposed turbulence generation models, experimental data on the intensity of turbulent velocity fluctuations in the near-surface sea layer obtained on an oceanographic platform are used. The turbulent energy dissipation rate is calculated using the vertical component of velocity vector fluctuations using the Kolmogorov hypothesis and Taylor's frozen turbulence hypothesis. A comparison of model and experimental data of dissipation rate values show the validity of the basic assumption that the intensity of wave-induced turbulence depends on the energy characteristics of the wave. At the same time, in situ data decrease with depth much slower than calculated data. A possible explanation could be the influence of turbulent diffusion and shear effects, as well as the inadequate parameterization of the wave energy transformation into turbulence.

in situ measurements, surface waves, turbulence generation, parameterization, dissipation rate

2021-11-23 13:33:37