Difference in the wind speeds required for initiation versus continuation of sand transport on Mars: Implications for dunes and dust storms

Details Difference in the wind speeds required for initiation versus continuation of sand transport on Mars: Implications for dunes and dust storms Difference in the wind speeds required for initiation versus continuation of sand transport on Mars: Implications for dunes and dust storms

2010-02-06

arxiv.org/abs/1002.1346v2

J. F. Kok, Phys. Rev. Lett., 104, 074502 (2010)

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

4 pages, 3 figures, published in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.104.074502

Much of the surface of Mars is covered by dunes, ripples, and other features formed by the blowing of sand by wind, known as saltation. In addition, saltation loads the atmosphere with dust aerosols, which dominate the Martian climate. We show here that saltation can be maintained on Mars by wind speeds an order of magnitude less than required to initiate it. We further show that the resulting hysteresis effect causes saltation to occur for much lower wind speeds than previously thought. These findings have important implications for the formation of dust storms, sand dunes, and ripples on Mars.

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