Mathematical Modeling of Vortex Interaction Using a Three-Layer Quasigeostrophic Model. Part 1: Point-Vortex Approach
Abstract
:1. Introduction
2. Three-Layer Model
3. Numerical Modeling of Vortex Interaction
3.1. Cyclonic Surfer Vortex and Anticyclonic Intrathermocline Lenses
3.2. Interaction of a Surface Vortex with Two Middle Layer Vortices
3.2.1. Collinear Initial Configuration
3.2.2. Impact of the Two External Intrathermocline Vortices on the Surface Cyclone
4. Discussion and Conclusions
- If the cyclone of the upper layer and the anticyclonic lens of the middle layer are separated by some distance, then such a two-layer vortex can either move forward (when its total effective vorticity is zero) or rotate relative to the center of vorticity (when its total effective vorticity is nonzero). In any case, both vortices can move far enough from the original location (Section 3.1).
- If two middle layer (intrathermocline) vortices of opposite signs are initially located on different sides relative to the central surface vortex, then (a) if they are separated far enough, all three vortices move inside individual coaxial annular regions; (b) if the distance between them is small, after a temporary bounded stage of movement, they leave the vicinity of the surface vortex (Section 3.2.1).
- If the intrathermocline vortices make up a pair running into the surface vortex, then two regimes are possible: (a) the pair passes under the surface vortex, changing its direction in its vicinity; (b) the dipole is delayed in the vicinity of the surface vortex, and at this intermediate stage, all three vortices move within a bounded region, after which it is freed from the influence of the cyclone and carried away from it. Such intermediate stages can have different durations which do not regularly depend on the initial distance between the vortices of the pair (Section 3.2.2).
- If the intrathermocline vortices have different intensities (which is a more realistic situation), then the vortices of the middle layer always move along loop-like trajectories in the vicinity of the surface vortex. For certain initial distances between the intrathermocline vortices, their movements have a periodic character (Section 3.2.2).
Author Contributions
Funding
Conflicts of Interest
References
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Sokolovskiy, M.A.; Carton, X.J.; Filyushkin, B.N. Mathematical Modeling of Vortex Interaction Using a Three-Layer Quasigeostrophic Model. Part 1: Point-Vortex Approach. Mathematics 2020, 8, 1228. https://doi.org/10.3390/math8081228
Sokolovskiy MA, Carton XJ, Filyushkin BN. Mathematical Modeling of Vortex Interaction Using a Three-Layer Quasigeostrophic Model. Part 1: Point-Vortex Approach. Mathematics. 2020; 8(8):1228. https://doi.org/10.3390/math8081228
Chicago/Turabian StyleSokolovskiy, Mikhail A., Xavier J. Carton, and Boris N. Filyushkin. 2020. "Mathematical Modeling of Vortex Interaction Using a Three-Layer Quasigeostrophic Model. Part 1: Point-Vortex Approach" Mathematics 8, no. 8: 1228. https://doi.org/10.3390/math8081228