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dc.contributor.authorde Marez, Charly
dc.contributor.authorCarton, Xavier
dc.contributor.authorMorvan, Mathieu
dc.contributor.authorReinaud, Jean Noel
dc.identifier.citationde Marez , C , Carton , X , Morvan , M & Reinaud , J N 2017 , ' The interaction of two surface vortices near a topographic slope in a stratified ocean ' , Fluids , vol. 2 , no. 4 , 57 .
dc.identifier.otherPURE: 251387809
dc.identifier.otherPURE UUID: 8c9a2b03-e199-4071-94dd-22f2652581d2
dc.identifier.otherORCID: /0000-0001-5449-6628/work/38124095
dc.identifier.otherScopus: 85063749863
dc.identifier.otherWOS: 000417975700009
dc.description.abstractWe study the influence of bottom topography on the interaction of two identical vortices in a two-layer, quasi-geostrophic model. The two vortices have piecewise-uniform potential vorticity, and are lying in the upper layer of the model. The topography is a smooth bottom slope. For two cyclones, topography modifies the merger critical distance and the merger efficiency: the topographic wave and vortices can advect the two cyclones along the shelf when they are initially far from it, or towards the shelf when they are initially closer to it. They can also advect the two cyclones towards each other, and thus favour merger. The topographic wave and vortices exert a deformation on these cyclones, which filament. Regimes of partial vortex merger or of vortex splitting are then observed. The interaction of the vorticity poles in the two layers are analysed to explain the evolution of the two upper layer cyclones. For taller topography, two new regimes appear: vortex drift and splitting, and filamentation and asymmetric merger. They are due to the hetonic coupling of lower layer vorticity with the upper vortices, or to the strong shear that the former exert on the latter. The interaction of two anticyclones shows regimes of co-rotation or merger, but specifically, it leads to the drift of the two vortices away from the slope, via a hetonic coupling with opposite signed vorticity in the lower layer. This vorticity originates in the breaking of the topographic wave. The analysis of passive tracer evolution confirms the inshore or offshore drift of the fluid, the formation of tracer fronts along filaments and its mixing in regions of vortex merger. The trajectories of particles indicates how the fluid initially in the vortices is finally partitioned.
dc.rightsCopyright 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
dc.subjectVortex interactionen
dc.subjectQuasi-geostrophic modelen
dc.subjectQA Mathematicsen
dc.subjectQC Physicsen
dc.subjectT Technologyen
dc.titleThe interaction of two surface vortices near a topographic slope in a stratified oceanen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.Applied Mathematicsen
dc.contributor.institutionUniversity of St Andrews.Scottish Oceans Instituteen
dc.description.statusPeer revieweden

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