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On Instability of Geostrophic Current with Linear Vertical Shear at Length Scales of Interleaving.
- Source :
-
Izvestiya, Atmospheric & Oceanic Physics . Jan2018, Vol. 54 Issue 1, p47-55. 9p. - Publication Year :
- 2018
-
Abstract
- The instability of long-wave disturbances of a geostrophic current with linear velocity shear is studied with allowance for the diffusion of buoyancy. A detailed derivation of the model problem in dimensionless variables is presented, which is used for analyzing the dynamics of disturbances in a vertically bounded layer and for describing the formation of large-scale intrusions in the Arctic basin. The problem is solved numerically based on a high-precision method developed for solving fourth-order differential equations. It is established that there is an eigenvalue in the spectrum of eigenvalues that corresponds to unstable (growing with time) disturbances, which are characterized by a phase velocity exceeding the maximum velocity of the geostrophic flow. A discussion is presented to explain some features of the instability. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00014338
- Volume :
- 54
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Izvestiya, Atmospheric & Oceanic Physics
- Publication Type :
- Academic Journal
- Accession number :
- 128230921
- Full Text :
- https://doi.org/10.1134/S0001433818010097