Peculiarities of Formation of the Density Field in Mesoscale Eddies of the Lofoten Basin: Part 2

Zhmur, V. V.; Novoselova, E. V.; Белоненко, Т. В.

doi:10.1134/s0001437022030171

Cited by 12 publications

(13 citation statements)

References 22 publications

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“…As for a deterministic velocity component, we consider a nondivergent 2D velocity field induced by an ellipsoidal vortex embedded in a deformation flow [11,13,[19][20][21]. A detailed description of the ellipsoidal vortex model is presented in Appendix A.…”

Section: Velocity Field Induced By the Ellipsoidal Eddymentioning

confidence: 99%

“…The system in Equations ( 10) and (11) for the trajectories of a passive tracer is a twoand-a-half-degree-of-freedom system, and thus the passive tracer trajectories can manifest chaotic behavior.…”

Section: Velocity Field Induced By the Ellipsoidal Eddymentioning

confidence: 99%

“…According to [11,13,[19][20][21], let us consider the deformation flow in the dimensionless coordinates…”

Section: Data Availability Statementmentioning

confidence: 99%

“…The present study investigates the role of a background vortex flow in floating tracer clustering. The vortex flow is induced by an ellipsoidal vortex embedded into a deformation flow [11][12][13]. Using the model, where the velocity field consists of deterministic and random components, we focus on the influence of the ellipsoidal vortex motion on floating tracer clustering.…”

Section: Introductionmentioning

confidence: 99%

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Clustering of Floating Tracers in a Random Velocity Field Modulated by an Ellipsoidal Vortex Flow

Koshel,

Stepanov,

Kuznetsova

et al. 2023

Symmetry

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The influence of a background vortex flow on the clustering of floating tracers is addressed. The vortex flow considered is induced by an ellipsoidal vortex evolving in a deformation. The system exhibits various vortex motion regimes: (1) a steady state, (2) oscillation and (3) rotation of the ellipsoidal vortex core. The latter two induce an unsteady velocity field for the tracer, thus leading to irregular (chaotic) tracer motion. Superimposing a stochastic divergent velocity field onto the deterministic vortex flow allows us to observe significantly different tracer evolution. An ellipsoidal vortex has ellipsoidal symmetry, and the tracer’s trajectories exhibit the same symmetry inside the vortex. Outside the vortex, the external deformation flow symmetry dominates. Diffusion scattering and chaotic advection give tracers the opportunity to leave the region of ellipsoidal symmetry and form a picture of shear flow symmetry. We use the method of characteristics to integrate the floating tracer density evolution equation and the Euler Ito scheme for obtaining the floating tracer trajectories with a random velocity field. The cluster area and cluster mass from the statistical topography are used as the quantitative diagnostics of a floating tracer’s clustering. For the case of a steady ellipsoidal vortex embedded into the deformation flow with a random velocity field component, we found that the clustering characteristics were weakened by the steady vortex. For the cases of an unsteady ellipsoidal vortex, we observed clustering in the floating tracer density field if the contribution of the divergent component was greater than or equal to that of the rotational (nondivergent) component. Even when the initial floating tracer patch was set on the boundary of the oscillating ellipsoidal vortex, we observed the formation of clusters. In the case of a rotating ellipsoidal vortex, we also observed pronounced clustering. Thus, we argue that unsteady ellipsoidal vortex regimes (oscillation and rotation), which induce chaotic motion of the nearby passive tracer’s trajectories, are still conducive to clustering of floating tracers observed in the density field, despite the intense deformation introduced by strain and shear.

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Section: Velocity Field Induced By the Ellipsoidal Eddymentioning

confidence: 99%

Section: Velocity Field Induced By the Ellipsoidal Eddymentioning

confidence: 99%

“…According to [11,13,[19][20][21], let us consider the deformation flow in the dimensionless coordinates…”

Section: Data Availability Statementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Clustering of Floating Tracers in a Random Velocity Field Modulated by an Ellipsoidal Vortex Flow

Koshel,

Stepanov,

Kuznetsova

et al. 2023

Symmetry

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show abstract

“…The spatial size of mesoscale eddies varies from the baroclinic Rossby deformation radius to a few hundreds of km, and their lifetime can reach the end of several years [Belonenko et al, 2020;Raj et al, 2016]. The main factor in the formation of mesoscale eddies is the baroclinic and barotropic instability of currents, which develops due to their close connection with the areas of FZs [Zhmur, 2011].…”

Section: Introductionmentioning

confidence: 99%

Vertical variability of the intensity of the frontal zones of the Norwegian Sea

Travkin,

Akhtyamova

2023

Russian Journal of Earth Sciences

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The Norwegian Sea is the meeting place of warm and salty Atlantic waters with cold and fresh Arctic waters. The thermal and haline frontal zones (FZs) formed as a result of this interaction are areas of increased horizontal gradients of physical, chemical, and biological parameters, and have a significant impact on regional circulation. Many mesoscale eddies are generated in the FZs which are actively involved in the eddy dynamics of the Norwegian Sea. The aim of this work is to analyze the spatio-temporal variability of the vertical structure of FZs in the Norwegian Sea, as well as the eddies that form within their boundaries. The work uses data from the oceanic reanalysis GLORYS12V1, as well as the Atlas of Mesoscale Eddies "Mesoscale Eddy Trajectory Atlas product META 3.2 DT" for the period 1993--2021. We analyze the average depth and thickness of FZs, the vertical distribution of their thermohaline gradients and areas. The work examines the seasonal and interannual variability of the volumes of thermal and haline FZs, the seasonal and interannual variability of mesoscale eddies, their spatial distribution, trajectories, and main parameters. In some areas, deepening of FZs has been established, and their thickness can reach 900 m. The presence of significant haline gradients in the layer of 250--750 m has been found, while thermal FZs can be traced vertically up to 1000 m compared with haline FZs. In some FZs, the interannual variability may exceed the seasonal one. The greatest variability of haline FZs can be traced in the autumn period, and the smallest -- in the winter--spring. It is noticeable in the summer period that thermal FZs weaken. Eddies can leave the boundaries of the FZs and move away from the place of origin for hundreds of kilometers. The number and lifetime of cyclones exceed similar estimates for anticyclones, while anticyclones travel long distances compared to cyclones.

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Modeling the Ventilation of the Vortex Periphery for Anticyclonic Quasi-Permanent Lofoten Vortex

Novoselova,

Fayman,

Didov

et al. 2024

Pure Appl. Geophys.

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Peculiarities of Formation of the Density Field in Mesoscale Eddies of the Lofoten Basin: Part 2

Cited by 12 publications

References 22 publications

Clustering of Floating Tracers in a Random Velocity Field Modulated by an Ellipsoidal Vortex Flow

Clustering of Floating Tracers in a Random Velocity Field Modulated by an Ellipsoidal Vortex Flow

Vertical variability of the intensity of the frontal zones of the Norwegian Sea

Modeling the Ventilation of the Vortex Periphery for Anticyclonic Quasi-Permanent Lofoten Vortex

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