Internal gravity waves in the energy and flux budget turbulence-closure theory for shear-free stably stratified flows

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http://hdl.handle.net/10138/312143

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Kleeorin , N , Rogachevskii , I , Soustova , I A , Troitskaya , Y , Ermakova , O S & Zilitinkevich , S 2019 , ' Internal gravity waves in the energy and flux budget turbulence-closure theory for shear-free stably stratified flows ' , Physical Review E , vol. 99 , no. 6 , 063106 . https://doi.org/10.1103/PhysRevE.99.063106

Title: Internal gravity waves in the energy and flux budget turbulence-closure theory for shear-free stably stratified flows
Author: Kleeorin, N.; Rogachevskii, I.; Soustova, I. A.; Troitskaya, Yu; Ermakova, O. S.; Zilitinkevich, S.
Contributor: University of Helsinki, Doctoral Programme in Atmospheric Sciences
Date: 2019-06-19
Language: eng
Number of pages: 11
Belongs to series: Physical Review E
ISSN: 2470-0045
URI: http://hdl.handle.net/10138/312143
Abstract: We have advanced the energy and flux budget turbulence closure theory that takes into account a two-way coupling between internal gravity waves (IGWs) and the shear-free stably stratified turbulence. This theory is based on the budget equation for the total (kinetic plus potential) energy of IGWs, the budget equations for the kinetic and potential energies of fluid turbulence, and turbulent fluxes of potential temperature for waves and fluid flow. The waves emitted at a certain level propagate upward, and the losses of wave energy cause the production of turbulence energy. We demonstrate that due to the nonlinear effects more intensive waves produce more strong turbulence, and this, in turn, results in strong damping of IGWs. As a result, the penetration length of more intensive waves is shorter than that of less intensive IGWs. The anisotropy of the turbulence produced by less intensive IGWs is stronger than that caused by more intensive waves. The low-amplitude IGWs produce turbulence consisting up to 90% of turbulent potential energy. This resembles the properties of the observed high-altitude tropospheric strongly anisotropic (nearly two-dimensional) turbulence.
Subject: PLANETARY BOUNDARY-LAYER
STEADY-STATE
DYNAMICS
MODEL
114 Physical sciences
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