Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992msat.work..110m&link_type=abstract
In Lunar and Planetary Inst., Workshop on the Martian Surface and Atmosphere Through Time p 110 (SEE N92-28988 19-91)
Physics
Atmospheric Circulation, Atmospheric General Circulation Models, Dust, Dust Storms, Mars Atmosphere, Mars Environment, Mars Surface, Aerosols, Computerized Simulation, Shear Stress, Stress Analysis, Wind Tunnels
Scientific paper
The primary mechanism by which dust is inserted into the Martian atmosphere is the interaction of low-level atmospheric motions with the planet's surface. Near-surface winds exert a shear stress upon dust particles resting on the Martian surface, and at some lower threshold limit of stress magnitude, approximately 0.04 N-m-2, particles are set into motion. Wind tunnel studies indicate that the first particles are too large to remain in suspension in the Martian atmosphere, but their impact back upon the surface can set smaller suspendable particles into motion. This process is termed saltation. Numerical simulations of Martian dust storms were carried out via the interactive coupling of the NASA Ames Mars general circulation Model with an aerosol transport/microphysical model.
Leovy Conway B.
Murphy Ronald J.
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