graduate student
Dolgoprudny, Moscow, Russian Federation
UDC 551.46.01
UDC 551.465.11
UDC 551.465
UDC 55
UDC 550.34
UDC 550.383
CSCSTI 37.01
CSCSTI 37.15
CSCSTI 37.25
CSCSTI 37.31
CSCSTI 38.01
CSCSTI 36.00
CSCSTI 37.00
CSCSTI 38.00
CSCSTI 39.00
CSCSTI 52.00
Russian Classification of Professions by Education 05.00.00
Russian Library and Bibliographic Classification 26
Russian Trade and Bibliographic Classification 63
BISAC SCI SCIENCE
This study examines the behavior of a circular ellipsoidal ocean vortex in an external baroclinic flow with vertical shear. It is established that the vortex lifetime under fixed initial parameter conditions strongly depends on the external shear parameter. Depending on the vortex lifetime, the representative point in the parameter space may reside in one of three zones: (1) the survival zone, where the vortex lifetime tends to infinity, (2) the finite lifetime zone, and (3) the stretching zone, where the vortex lifetime approaches zero. At a certain shear velocity value, the infinite vortex lifetime becomes finite. This shear value, corresponding to the boundary between zones (1) and (2), is characterized as critical. The critical shear, in turn, depends on the initial geometric parameters of the vortex core. The work also investigates the vortex energy evolution. It is shown that during vortex stretching by the baroclinic flow, the total mechanical energy decreases both for the core and the entire vortex. Furthermore, the quasi-geostrophic balance remains valid for all three behavioral regimes.
ellipsoidal vortex, vortex lifetime, critical shear, vortex energy, Rossby number
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