Skip to content

Research at St Andrews

The alignment of two three-dimensional quasi-geostrophic vortices

Research output: Contribution to journalArticle

Open Access Status

  • Embargoed (until 25/08/20)

Author(s)

Jean N. Reinaud, Xavier Carton

School/Research organisations

Abstract

We consider the interaction between two quasi-geostrophic vortices of height-to-width aspect ratio h/r, lying at two different vertical levels. We investigate whether such structures naturally align. In the case the vortices occupy distinct yet contiguous vertical levels, such an alignment can contribute to the growth in volume of oceanic mesoscale vortices. The other growth mechanism is the merger of vortices sharing common vertical levels. We show that there exist titled equilibrium states where vortices nearly align slantwise. Most equilibria for prolate vortices (h/r > 1) are stable apart in a very narrow region of the parameter space. The instability is however normally non-destructive. Pairs of oblate vortices may also be in an unstable equilibria if they are moderately offset in the horizontal direction. In this case, the instability may result in the shedding of filamentary potentially vorticity away from the vortices. This shedding of potential vorticity may result in the further alignment of the main structures.
Close

Details

Original languageEnglish
Number of pages33
JournalGeophysical and Astrophysical Fluid Dynamics
VolumeLatest Articles
Early online date25 Aug 2019
DOIs
Publication statusE-pub ahead of print - 25 Aug 2019

    Research areas

  • Vortex dynamics, Vortex alignment, Quasi-geostophy

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

View graph of relations

Related by author

  1. 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

  2. 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

  3. 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

  4. 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

  5. The merger of geophysical vortices at finite Rossby and Froude number

    Reinaud, J. N. & Dritschel, D. G., 10 Aug 2018, In : Journal of Fluid Mechanics. 848, p. 388-410 23 p.

    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

ID: 260407069

Top