The particle size of Martian aeolian dunes

K. S. Edgett, Philip Christensen

Research output: Contribution to journalArticle

123 Citations (Scopus)

Abstract

Because dunes consist of a narrow range of well-sorted, unconsolidated particles, they provide for a test of the relationship between particle size and thermal inertia calculated from midinfrared emission data for the Martian surface. Two independent approaches are used. First, thermal inertia data indicate that Martian dunes have an average particle size of about 500 ± 100 μm, or medium to coarse sand. Second, expected dune particle sizes are determined from grain trajectory calculations and the particle size transition from suspension to saltation. Both approaches indicate that Martian dune sand should be coarser than terrestrial dune sand. Results closely match the grain sizes determined from thermal inertia models, providing the first direct test of the validity of these models for actual Martian surface materials. -from Authors

Original languageEnglish (US)
JournalJournal of Geophysical Research
Volume96
Issue numberE5
StatePublished - 1991

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dunes
dune
Particle size
particle size
Sand
inertia
saltation
Suspensions
Trajectories
sands
grain size
trajectory
trajectories
sand
Hot Temperature

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

The particle size of Martian aeolian dunes. / Edgett, K. S.; Christensen, Philip.

In: Journal of Geophysical Research, Vol. 96, No. E5, 1991.

Research output: Contribution to journalArticle

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AB - Because dunes consist of a narrow range of well-sorted, unconsolidated particles, they provide for a test of the relationship between particle size and thermal inertia calculated from midinfrared emission data for the Martian surface. Two independent approaches are used. First, thermal inertia data indicate that Martian dunes have an average particle size of about 500 ± 100 μm, or medium to coarse sand. Second, expected dune particle sizes are determined from grain trajectory calculations and the particle size transition from suspension to saltation. Both approaches indicate that Martian dune sand should be coarser than terrestrial dune sand. Results closely match the grain sizes determined from thermal inertia models, providing the first direct test of the validity of these models for actual Martian surface materials. -from Authors

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