New criterion for sediment suspension and wind-speed proxy in planetary atmospheres

Physics

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Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Processes: Boundary Layer Processes, Atmospheric Processes: Turbulence (4490), Atmospheric Processes: General Or Miscellaneous, Planetary Sciences: Solid Surface Planets: Erosion And Weathering

Scientific paper

Sediment suspension is a common and important phenomenon in planetary atmospheres. A widely-used suspension criterion, also a proxy boundary layer wind-speed indicator, was discredited by Mars Exploration Rover Mission results concerning sediment particle sizes in active surface bed forms. Parameterisation of a new dynamic suspension criterion based upon turbulent stress yields predicted suspension threshold conditions consistent with those inferred for Earth and predicts no suspension of sand-grade particles for recent Martian wind velocities (at 1m height) estimated in the range 28-73 m s-1. Results for Venus imply suspension of very fine sand particles at low surface wind speeds.

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