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Physical and chemical modification of the surface of Venus by windblown particles

Abstract

Several investigators have speculated on the possibility of wind erosion on Venus1–3. Although winds of sufficient strength to move particles are documented4,5 and many investigators suggest active aeolian processes6, the style and efficiency of erosion are open to question. Here we present the results of simulations of the venusian surface environment involving windblown grains, which show that significant chemical and physical changes may occur, even in the slow-moving winds recorded on Venus. The edges of grains become worn and shed comminuted debris, which collects on weathered surfaces and grains alike. The resulting transfer of material from loose grains to bedrock surfaces (and vice versa) could yield misleading results on rock composition; moreover, the generation of comminuted debris would enhance chemical reactions that could affect the composition of the atmosphere. These results are thus relevant in assessing rates of surface degradation, the evolution of small-scale (less than a few metres) surface features as seen in images returned from the Soviet Venera missions8,9 and in the interpretation of compositional data for surface materials10.

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References

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Greeley, R., Marshall, J. & Pollack, J. Physical and chemical modification of the surface of Venus by windblown particles . Nature 327, 313–315 (1987). https://doi.org/10.1038/327313a0

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