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Related Experiment Videos

Anisotropic geophysical vortices.

James C. McWilliams1, Jeffrey B. Weiss

  • 1Geophysical Turbulence Program, NCAR, Boulder, Colorado 80307Program in Atmospheric and Oceanic Sciences, Astrophysical, Planetary, and Atmospheric Sciences, University of Colorado, Boulder, Colorado 80309.

Chaos (Woodbury, N.Y.)
|June 1, 1994
PubMed
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This study defines coherent vortices in Earth's ocean and atmosphere, exploring their role in anisotropic fluid dynamics. Numerical analysis reveals insights into vortex behavior, enstrophy cascades, and the transition to nonturbulent states.

Area of Science:

  • Fluid dynamics
  • Geophysics
  • Atmospheric science
  • Oceanography

Background:

  • Coherent vortices are prevalent in Earth's ocean and atmosphere.
  • These vortices exhibit significant anisotropy in velocity and vorticity fields due to environmental factors.
  • Understanding their dynamics is crucial for comprehending complex fluid motions.

Purpose of the Study:

  • To define the essential characteristics of coherent vortices.
  • To hypothesize their dynamical role in anisotropic fluid systems.
  • To analyze numerical solutions for phenomena related to vortex dynamics.

Main Methods:

  • Survey of coherent vortex types in oceanic and atmospheric systems.
  • Formulation of hypotheses on vortex dynamical roles.

Related Experiment Videos

  • Numerical analysis of 3D rotating, stratified flow and 2D flow.
  • Examination of enstrophy cascade, dissipation, intermittency, and isotropy.

    • Main Results:

    • Identification of key characteristics defining coherent vortices.
    • Hypotheses proposed regarding their dynamical significance.
    • Numerical simulations demonstrate enstrophy cascade, dissipation, and intermittency.
    • Analysis of coherent vortex emergence, population dynamics, and approach to a nonturbulent state.

    Conclusions:

    • Coherent vortices play a significant role in geophysical fluid dynamics.
    • Anisotropy is a key feature influencing vortex behavior.
    • Numerical modeling provides a framework for studying vortex dynamics and their eventual dissipation.