Author:
KIZNER Z.,BERSON D.,KHVOLES R.
Abstract
The objective of this work is a numerical study of the stability properties and the
evolution of the eastward-travelling baroclinic modons – coherent vortex structures
specific to stratified geophysical fluids where differential rotation (the β-effect) is
of the essence. In the vortices under study, the initial dependence of the potential
vorticity (PV) upon the streamfunction is piecewise-linear, the barotropic component
is dipolar, the baroclinic component is circularly symmetric about the vertical axis,
and the boundary of the trapped-fluid region (in which the vorticity contours are
closed) is a circular cylinder. These modons are shown to be stable for a wide range
of parameters. In two- and three-layer fluids, modons of this type are shown to be
able to transit to even more durable states, in which the trapped-fluid area is oval
in shape and the PV versus streamfunction dependence in this domain is nonlinear.
Possible transition mechanisms and linkage between the circular and oval modons
are discussed.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
28 articles.
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