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On the Relationship between Dust Devil Radii and Heights.

Brian Jackson1

  • 1Boise State University, Dept. of Physics 1910 University Drive, Boise ID 83725-1570.

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|December 7, 2019
PubMed
Summary

Martian dust devils

Area of Science:

  • Planetary Science
  • Atmospheric Science

Background:

  • Dust devils influence Mars' atmosphere by lofting dust.
  • Dust devil dust lofting capacity depends on wind profiles and surface footprint (radius).
  • Previous research linked wind profiles to thermodynamic efficiency and height, but radius mechanisms were unclear.

Purpose of the Study:

  • To clarify the mechanisms determining Martian dust devil radii.
  • To investigate the relationship between dust devil radius and height.

Main Methods:

  • Combined previous research with angular momentum conservation assumptions.
  • Developed a predictive model for dust devil radius (R ∝ h^1/2).
  • Fit the model to observed radii and heights from Mars Express High Resolution Stereo Camera data.
Keywords:
Marsatmosphere — Marsclimate — Marssurface

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Main Results:

  • The model predicting R ∝ h^1/2 showed reasonable agreement with observed Martian dust devil data.
  • This suggests a link between dust devil height and radius.

Conclusions:

  • The study provides a theoretical and observational basis for understanding Martian dust devil radii.
  • Further observational tests are recommended to refine these relationships.