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Related Experiment Videos

Long-lived planetary vortices and their evolution: Conservative intermediate geostrophic model.

Georgi G. Sutyrin1

  • 1Russian Academy of Sciences, P. P. Shirshov Institute of Oceanology, 23 Krasikova Street, Moscow 117218, Russia.

Chaos (Woodbury, N.Y.)
|June 1, 1994
PubMed
Summary

Intense vortices in planetary fluids persist longer than linear waves due to rapid core rotation. Cyclonic and anticyclonic vortices exhibit distinct long-term behaviors, influencing their prevalence in atmospheres and oceans.

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Area of Science:

  • Fluid dynamics
  • Atmospheric science
  • Oceanography

Background:

  • Planetary atmospheres and oceans host abundant large, long-lived vortices.
  • These vortices persist much longer than dispersive linear Rossby wave packets.
  • Nonlinear effects are crucial for vortex survival and self-propelling propagation.

Purpose of the Study:

  • To revise the understanding of nonlinear effects on intense cyclones and anticyclones.
  • To investigate the physical mechanisms enabling long-lived vortical structures.
  • To analyze the differing long-term evolution of cyclonic and anticyclonic vortices.

Main Methods:

  • Utilized shallow water equations and their balanced approximations.
  • Employed the conservative intermediate geostrophic model.

Related Experiment Videos

  • Analyzed azimuthal mode m=1 for vortex propagation.

    • Main Results:

    • Vortices with azimuthal velocity exceeding Rossby wave speed survive longer.
    • Cyclonic vortices propagate west-poleward and decay via Rossby wave radiation.
    • Anticyclonic vortices evolve into non-radiating solitary structures.
    • Cyclone poleward motion mirrors tropical cyclone trajectories.

    Conclusions:

    • Rapid fluid rotation in vortex cores prevents amplitude growth from the beta-effect, ensuring longevity.
    • Asymmetric dispersion-nonlinear properties of cyclones and anticyclones explain their observed prevalence.
    • Anticyclones are more common among long-lived vortices in giant planet atmospheres and ocean eddies.