FN Archimer Export Format
PT J
TI Mathematical Modeling of Vortex Interaction Using a Three-Layer Quasigeostrophic Model. Part 2: Finite-Core-Vortex Approach and Oceanographic Application
BT
AF SOKOLOVSKIY, Mikhail A.
CARTON, Xavier
FILYUSHKIN, Boris N.
AS 1:1,2;2:3;3:2;
FF 1:;2:;3:;
C1 Russian Acad Sci, Water Problems Inst, 3 Gubkina Str, Moscow 119333, Russia.
Russian Acad Sci, Shirshov Inst Oceanol, 36 Nahimovskiy Prosperkt, Moscow 117997, Russia.
IUEM UBO, Lab Oceanog Phys & Spatiale, Rue Dumont DUrville, F-29280 Plouzane, France.
C2 RUSSIAN ACAD SCI, RUSSIA
PP SHIRSHOV OCEANOL INST, RUSSIA
UBO, FRANCE
UM LOPS
IN WOS Cotutelle UMR
DOAJ
copubli-int-hors-europe
IF 1.105
TC 2
UR https://archimer.ifremer.fr/doc/00695/80728/84557.pdf
LA English
DT Article
DE ;quasi-geostrophic model;vortex interaction;intrathermocline lens;point vortex;finite-core vortices
AB The three-layer version of the contour dynamics/surgery method is used to study the interaction mechanisms of a large-scale surface vortex with a smaller vortex/vortices of the middle layer (prototypes of intrathermocline vortices in the ocean) belonging to the middle layer of a three-layer rotating fluid. The lower layer is assumed to be dynamically passive. The piecewise constant vertical density distribution approximates the average long-term profile for the North Atlantic, where intrathermocline eddies are observed most often at depths of 300-1600 m. Numerical experiments were carried out with different initial configurations of vortices, to evaluate several effects. Firstly, the stability of the vortex compound was evaluated. Most often, it remains compact, but when unstable, it can break as vertically coupled vortex dipoles (called hetons). Secondly, we studied the interaction between a vertically tilted cyclone and lenses. Then, the lenses first undergo anticlockwise rotation determined by the surface cyclone. The lenses can induce alignment or coupling with cyclonic vorticity above them. Only very weak lenses are destroyed by the shear stress exerted by the surface cyclone. Thirdly, under the influence of lens dipoles, the surface cyclone can be torn apart. In particular, the shedding of rapidly moving vortex pairs at the surface reflects the presence of lens dipoles below. More slowly moving small eddies can also be torn away from the main surface cyclone. In this case, they do not appear to be coupled with middle layer vortices. They are the result of large shear-induced deformation. Common and differing features of the vortex interaction, modeled in the framework of the theory of point and finite-core vortices, are noted.
PY 2020
PD AUG
SO Mathematics
SN 2227-7390
PU Mdpi
VL 8
IS 8
UT 000564645800001
DI 10.3390/math8081267
ID 80728
ER
EF