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Float trajectories in simple kinematic flows.

L Regier1, H Stommel

  • 1Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543.

Proceedings of the National Academy of Sciences of the United States of America
|October 1, 1979
PubMed
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Simple kinematic models reveal that trapping regions significantly increase tracer dispersion rates. These models highlight challenges in estimating flow properties from limited Lagrangian data, especially when eddy velocities are high.

Area of Science:

  • Geophysical Fluid Dynamics
  • Oceanography
  • Atmospheric Science

Background:

  • Understanding tracer dispersion is crucial for modeling transport in geophysical flows.
  • Lagrangian trajectories offer insights into particle movement, distinct from Eulerian viewpoints.
  • Previous models often oversimplify complex flow dynamics.

Purpose of the Study:

  • To investigate tracer behavior using a simplified kinematic model.
  • To identify factors influencing tracer dispersion rates and spatial scales.
  • To assess the challenges in estimating Eulerian flow parameters from Lagrangian data.

Main Methods:

  • Computation of Lagrangian trajectories using a simple kinematic model.
  • Analysis of tracer dispersion in the presence of trapping regions.

Related Experiment Videos

  • Comparison of Eulerian and Lagrangian spatial scales.

    • Main Results:

    • Trapping regions were found to significantly enhance tracer dispersion.
    • Net tracer displacements can occur even with zero mean Eulerian flow.
    • Lagrangian trajectories exhibit a wider spectrum of shorter spatial scales than Eulerian fields.

    Conclusions:

    • Simple models provide valuable insights into Lagrangian tracer behavior.
    • Estimating Eulerian flow properties from limited Lagrangian data requires caution, especially with significant eddy velocities.
    • Further research is needed for realistic flow models, advanced data analysis, and relating Eulerian/Lagrangian spectra.