Now showing items 1-17 of 17

  • The critical merger distance between two co-rotating quasi-geostrophic vortices 

    Reinaud, Jean Noel; Dritschel, David Gerard (2005-01-10) - Journal article
    This paper examines the critical merger or strong interaction distance between two equal-potential-vorticity quasi-geostrophic vortices. The interaction between the two vortices depends on five parameters: their volume ...
  • Existence, stability and formation of baroclinic triples in quasi-geostrophic flows 

    Reinaud, Jean Noel; Carton, Xavier (2015-12) - Journal article
    Hetons are baroclinic vortices able to transport tracers or species, and which have been observed at sea. This paper studies the offset collision of two identical hetons, often resulting in the formation of a baroclinic ...
  • Geostrophic tripolar vortices in a two-layer fluid : linear stability and nonlinear evolution of equilibria 

    Reinaud, Jean Noel; Sokolovskiy, Mikhail; Carton, Xavier (2017-03) - Journal article
    We investgate equilibrium solutions for tripolar vortices in a two-layer quasi-geostrophic flow. Two of the vortices are like-signed and lie in one layer. An opposite-signed vortex lies in the other layer. The families of ...
  • Head on collisions between two quasi-geostrophic hetons in a continuously stratified fluid 

    Reinaud, Jean Noel; Carton, Xavier (2015-09) - Journal article
    We examine the interactions between two three-dimensional quasi-geostrophic hetons. The hetons are initially translating towards one another. We address the effect of the vertical distance between the two poles (vortices) ...
  • Interaction between a quasi-geostrophic buoyancy filament and a heton 

    Reinaud, Jean Noel; Carton, Xavier; Dritschel, David Gerard (2017-09) - Journal article
    We investigate the interaction between a heton and a current generated by a filament of buoyancy anomaly at the surface. Hetons are baroclinic dipoles consisting of a pair of vortices of opposite sign lying at different ...
  • Interaction between a surface quasi-geostrophic buoyancy anomaly jet and internal vortices 

    Reinaud, Jean Noel; Dritschel, David Gerard; Carton, Xavier (2017-08) - Journal article
    This paper addresses the dynamical coupling of the ocean's surface and the ocean's interior. In particular, we investigate the dynamics of an oceanic surface jet, and its interaction with vortices at depth. The jet is ...
  • Interaction between a surface quasi-geostrophic buoyancy filament and an internal vortex 

    Reinaud, Jean Noel; Dritschel, David Gerard; Carton, Xavier (2016-09-23) - Journal article
    This paper focuses on the nonlinear interaction between a surface quasi-geostrophic buoyancy filament and an internal vortex. We first revisit the stability of an isolated buoyancy filament. The buoyancy profile considered ...
  • The interaction between two oppositely travelling, horizontally offset, antisymmetric quasi-geostrophic hetons 

    Reinaud, Jean Noel; Carton, Xavier (2016-05) - Journal article
    We investigate numerically the nonlinear interactions between hetons. Hetons are baroclinic structures consisting of two vortices of opposite sign lying at different depths. Hetons are long-lived. They most often translate ...
  • The interaction of two surface vortices near a topographic slope in a stratified ocean 

    de Marez, Charly; Carton, Xavier; Morvan, Mathieu; Reinaud, Jean Noel (2017-12) - Journal article
    We 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 ...
  • An investigation into the use of balance in operational numerical weather prediction 

    Devlin, David J.J. (University of St Andrews, 2011) - Thesis
    Presented in this study is a wide-ranging investigation into the use of properties of balance in an operational numerical weather prediction context. Initially, a joint numerical and observational study is undertaken. ...
  • The merger of vertically offset quasi-geostrophic vortices 

    Reinaud, Jean Noel; Dritschel, David Gerard (2002-10-25) - Journal article
    We examine the critical merging distance between two equal-volume, equal-potential-vorticity quasi-geostrophic vortices. We focus on how this distance depends on the vertical offset between the two vortices, each having a ...
  • On the stability of continuously stratified quasi-geostrophic hetons 

    Reinaud, Jean Noel (2015-04-30) - Journal article
    In this paper we examine the stability of quasi-geostrophic hetons in a stably, continuously stratified fluid. To this purpose we first determinate numerically equilibrium states. Equilibrium hetons consist of two vortices ...
  • The quasi-geostrophic ellipsoidal vortex model 

    Dritschel, David Gerard; Reinaud, Jean Noel; McKiver, William J (2004-04-25) - Journal article
    We present a simple approximate model for studying general aspects of vortex interactions in a rotating stably-stratified fluid. The model idealizes vortices by ellipsoidal volumes of uniform potential vorticity, a materially ...
  • The shape of vortices in quasi-geostrophic turbulence 

    Reinaud, Jean Noel; Dritschel, David Gerard; Koudella, CR (2003-01-10) - Journal article
    The present work discusses the most commonly occurring shape of the coherent vortical structures in rapidly rotating stably stratified turbulence, under the quasi-geostrophic approximation. In decaying turbulence, these ...
  • Strong interaction between two co-rotating vortices in rotating and stratified flows. 

    Bambrey, Ross R. (University of St Andrews, 2007) - Thesis
    In this study we investigate the interactions between two co-rotating vortices. These vortices are subject to rapid rotation and stable stratification such as are found in planetary atmospheres and oceans. By conducting ...
  • Vortex merger in surface quasi-geostrophy 

    Carton, Xavier; Ciani, Daniele; Verron, Jacques; Reinaud, Jean Noel; Sokolovskiy, Mikhail (2016) - Journal article
    The merger of two identical surface temperature vortices is studied in the surface quasi- geostrophic model. The motivation for this study is the observation of the merger of sub- mesoscale vortices in the ocean. Firstly, ...
  • Vortex merger near a topographic slope in a homogeneous rotating fluid 

    Carton, Xavier; Morvan, Mathieu; Reinaud, Jean Noel; Sokolovskiy, Mikhail; L'Hégaret, Pierre; Vic, Clément (2017-10-01) - Journal article
    The effect of a bottom slope on the merger of two identical Rankine vortices is investigated in a two dimensional, quasi-geostrophic, incompressible fluid. When two cyclones initially lie parallel to the slope, and more ...