We compare the results obtained by using theoretical and semiempirical models developed for the evaluation of the dissipation rate of turbulent energy ε in a stratified ocean with independent distribution of this quantity established by the authors for the active layer of the Black Sea (50–300 m) by using a one-dimensional model taking into account the balance of heat, salt, and fluid inside the layer. It is shown that, in a layer with gradual variation of the Väisälä–Brunt frequency N as a function of depth, the predominant “sink” of the energy of motion into dissipation ε ∼ N 2 is ensured by the flow of energy through the spectrum of internal waves toward low frequencies and small vertical scales. On the contrary, in layers with abrupt drops of density as a function of depth (layers with “jumps of density”), an important role is played by the interface-type waves and the dependence of ε on N transforms into ε ∼ N .
Physical Oceanography – Springer Journals
Published: Oct 20, 2004
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