Skip to content

Research at St Andrews

Vortex merger in surface quasi-geostrophy

Research output: Contribution to journalArticle

Author(s)

Xavier Carton, Daniele Ciani, Jacques Verron, Jean Noel Reinaud, Mikhail Sokolovskiy

School/Research organisations

Abstract

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, the interaction between two point vortices, in the absence or in the presence of an external deformation field, is investigated. The rotation rate of the vortices, their stationary positions and the stability of these positions are determined. Then, a numerical model provides the steady states of two finite-area, constant-temperature, vortices. Such states are less deformed than their counterparts in two-dimensional incom- pressible flows. Finally, numerical simulations of the nonlinear surface quasi-geostrophic equations are used to investigate the finite-time evolution of initially identical and sym- metric, constant temperature vortices. The critical merger distance is obtained and the deformation of the vortices before or after merger is determined. The addition of external deformation is shown to favor or to oppose merger depending on the orientation of the vor- tex pair with respect to the strain axes. An explanation for this observation is proposed. Conclusions are drawn towards an application of this study to oceanic vortices.
Close

Details

Original languageEnglish
Number of pages22
JournalGeophysical and Astrophysical Fluid Dynamics
Volume110
Issue number1
Early online date23 Dec 2015
DOIs
Publication statusPublished - 2016

    Research areas

  • Surface quasi-geostrophy, Vortex merger, Steady states, Critical distance, Shear/strain flow, Numerical model

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. The alignment of two three-dimensional quasi-geostrophic vortices

    Reinaud, J. N. & Carton, X., 25 Aug 2019, In : Geophysical and Astrophysical Fluid Dynamics. Latest Articles, 33 p.

    Research output: Contribution to journalArticle

  2. Three-dimensional quasi-geostrophic vortex equilibria with m−fold symmetry

    Reinaud, J. N., 25 Mar 2019, In : Journal of Fluid Mechanics. 863, p. 32-59

    Research output: Contribution to journalArticle

  3. The stability and nonlinear evolution of quasi-geostrophic toroidal vortices

    Reinaud, J. N. & Dritschel, D. G., 25 Mar 2019, In : Journal of Fluid Mechanics. 863, p. 60-78

    Research output: Contribution to journalArticle

  4. Entrapping of a vortex pair interacting with a fixed point vortex revisited. II. Finite size vortices and the effect of deformation

    Reinaud, J. N., Koshel, K. V. & Ryzhov, E. A., 28 Sep 2018, In : Physics of Fluids. 30, 9, 10 p., 096604.

    Research output: Contribution to journalArticle

  5. Entrapping of a vortex pair interacting with a fixed point vortex revisited. I. Point vortices

    Koshel, K. V., Reinaud, J. N., Riccardi, G. & Ryzhov, E. A., 28 Sep 2018, In : Physics of Fluids. 30, 9, 096603.

    Research output: Contribution to journalArticle

Related by journal

  1. Geophysical and Astrophysical Fluid Dynamics (Journal)

    Eric Ronald Priest (Member of editorial board)
    1998 → …

    Activity: Publication peer-review and editorial work typesEditor of research journal

  2. Geophysical and Astrophysical Fluid Dynamics (Journal)

    Alan William Hood (Editor)
    1980 → …

    Activity: Publication peer-review and editorial work typesEditor of research journal

Related by journal

  1. The alignment of two three-dimensional quasi-geostrophic vortices

    Reinaud, J. N. & Carton, X., 25 Aug 2019, In : Geophysical and Astrophysical Fluid Dynamics. Latest Articles, 33 p.

    Research output: Contribution to journalArticle

  2. The interaction of two asymmetric quasi-geostrophic vortex patches

    Jalali, M. M. & Dritschel, D. G., 16 Oct 2018, In : Geophysical and Astrophysical Fluid Dynamics. Latest Articles

    Research output: Contribution to journalArticle

  3. Piecewise uniform potential vorticity pancake shielded vortices

    Reinaud, J. N., 2017, In : Geophysical and Astrophysical Fluid Dynamics. 111, 1, p. 32-64 33 p.

    Research output: Contribution to journalArticle

ID: 219079012

Top