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

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