Baroclinic instability in geophysical fluid dynamics

M.V. Kalashnik^†, M.V. Kurgansky, O.G. Chkhetiani
A M Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, Pyzhevskii per. 3, Moscow, 109017, Russian Federation

Baroclinic instability is that of flows in a rotating stratified fluid with a vertical velocity shear. The generation of large-scale vortical flows in the atmospheres of Earth and other planets is associated with this instability. The review presents modern theoretical approaches dealing with this instability. They include a description of baroclinic instability through the interaction of edge Rossby waves, the study of the problem of optimal perturbations, i.e., those characterized by the largest growth of energy or other functionals, and an analysis of the nonlinear dynamics of perturbations that relies on a low-mode approximation of the Galerkin method. Classical energy criteria for the stability of zonal flows obtained by the direct Lyapunov—Arnold method are also considered. The results presented may be of interest to specialists in the field of continuum mechanics and astrophysics.

Keywords: geophysical fluid dynamics, baroclinic instability, energy criteria of stability, nonlinear perturbation dynamics, Galerkin method
PACS: 05.45.−a, 47.10.−g, 47.20.Ft, 47.20.Ky, 47.27.Cn, 47.32.−y, 47.32.Ef, 47.32.cd, 47.85.Dh, 92.10.Lq, 92.60.−e, 92.60.hk (all)
DOI: 10.3367/UFNe.2021.08.039046
URL: https://ufn.ru/en/articles/2022/10/c/
Web of Science

001112536300003
Scopus

2-s2.0-85144631071
ADS NASA

2022PhyU...65.1039K
Citation: Kalashnik M V, Kurgansky M V, Chkhetiani O G "Baroclinic instability in geophysical fluid dynamics" Phys. Usp. 65 1039–1070 (2022)

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Received: 2nd, June 2021, revised: 20th, August 2021, accepted: 26th, August 2021

Оригинал: Калашник М В, Курганский М В, Чхетиани О Г «Бароклинная неустойчивость в геофизической гидродинамике» УФН 192 1110–1144 (2022); DOI: 10.3367/UFNr.2021.08.039046

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