Preprints
https://doi.org/10.5194/npg-2023-22
https://doi.org/10.5194/npg-2023-22
15 Nov 2023
 | 15 Nov 2023
Status: a revised version of this preprint was accepted for the journal NPG.

Evolution of small-scale turbulence at large Richardson numbers

Lev Ostrovsky, Irina Soustova, Yuliya Troitskaya, and Daria Gladskikh

Abstract. The theory of stratified turbulent flow developed earlier by the authors is applied to data from the upper oceanic level to confirm that small-scale turbulence can be amplified and supported at a quasi-stationary level even at large gradient Richardson numbers due to the exchange between kinetic and potential energies. Using the mean profiles of Brunt-Väisälä frequency and vertical current shear given in Forryan et al. (2013), the profiles of kinetic energy dissipation rate are calculated, to be in reasonable agreement with the experimental data. This confirms the importance of including potential energy into realistic models of subsurface turbulence.

Lev Ostrovsky, Irina Soustova, Yuliya Troitskaya, and Daria Gladskikh

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on npg-2023-22', Anonymous Referee #1, 05 Dec 2023
    • AC2: 'Reply on RC1', Lev Ostrovsky, 12 Feb 2024
  • RC2: 'Comment on npg-2023-22', Anonymous Referee #2, 17 Dec 2023
    • AC1: 'Reply on RC2', Lev Ostrovsky, 12 Feb 2024
Lev Ostrovsky, Irina Soustova, Yuliya Troitskaya, and Daria Gladskikh
Lev Ostrovsky, Irina Soustova, Yuliya Troitskaya, and Daria Gladskikh

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Short summary
The non-stationary kinetic model of turbulence is used to describe the evolution and structure of the upper turbulent layer with the parameters taken from in situ observations. As an example, we use set of data for three cruises made in different areas of the world ocean. With the given profiles of current shear and buoyancy frequency, the theory yields the results that satisfactorily agree with the measurements of the turbulent dissipation rate.