Nonlinear Gravitational Waves and Atmospheric Instability

— This is an outline of the main results of the study of dust devils (a type of atmospheric vortices) with a focus on the mechanism of vortex generation in an unstable stratified atmosphere. In the approximation of ideal hydrodynamics, a new nonlinear model of the generation of convective motions an...

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Bibliographic Details
Published in:Izvestiya. Atmospheric and oceanic physics 2018-12, Vol.54 (10), p.1423-1429
Main Authors: Onishchenko, O. G., Pokhotelov, O. A., Astafieva, N. M.
Format: Article
Language:English
Subjects:
Approximation
Atmosphere
Atmospheric particulates
Climatology
Computational fluid dynamics
Dust
Dust devils
Dust storms
Earth and Environmental Science
Earth Sciences
Fluid flow
Geophysics/Geodesy
Gravitational waves
Gravity waves
Hydrodynamics
Internal gravity waves
Internal waves
Mathematical analysis
Nonlinear equations
Plumes
Velocity
Vertical vorticity
Vortices
Vorticity
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Summary:— This is an outline of the main results of the study of dust devils (a type of atmospheric vortices) with a focus on the mechanism of vortex generation in an unstable stratified atmosphere. In the approximation of ideal hydrodynamics, a new nonlinear model of the generation of convective motions and dust devils in an unstable stratified atmosphere has been developed. Using nonlinear equations for internal gravity waves, the model of generation of convective cell plumes has been investigated in the axially symmetric approximation. It has been shown that, in a convectively unstable atmosphere with large-scale seed vorticity, the plumes extremely rapidly generate small-scale intense vertical vortices. The structure of radial, vertical, and toroidal velocity components in these vortices has been investigated. The structure of vertical vorticity and toroidal velocity in vortex areas that are limited by radius has been examined.
ISSN:0001-4338
1555-628X
DOI:10.1134/S0001433818100079