Simulation of Mars Dust Devils with the Mars Regional Atmospheric Modeling System

Details Simulation of Mars Dust Devils with the Mars Regional Atmospheric Modeling System Simulation of Mars Dust Devils with the Mars Regional Atmospheric Modeling System

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p32e..06m&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #P32E-06

Physics

3307 Boundary Layer Processes, 3322 Land/Atmosphere Interactions, 3337 Numerical Modeling And Data Assimilation, 3346 Planetary Meteorology (5445, 5739), 5409 Atmospheres: Structure And Dynamics

Scientific paper

Dust devils have been repeatedly observed on Mars by the Viking Orbiters and Landers, the Mars Pathfinder, and the Mars Global Surveyor. Dust devils are low-pressure, warm-core boundary layer vortices which occur underneath convective plumes and lift dust from the surface. On Earth, they are frequently observed in hot, arid regions and move with the ambient wind. On Mars, these vortices may play an important role in the maintenance of the atmospheric dust load. In order to further quantify the significance of such dust lifting, as well as to gain a detailed understanding of the life cycles of these phenomena, a large eddy simulation (LES) was performed using the Mars Regional Atmospheric Modeling System (MRAMS). In the LES, dust devil-like circulations were observed throughout the afternoon hours. The entire life cycle of one of the vortices was captured in detail using an additional nested grid. Simulated pressure perturbations and the dimensions of these circulations are in general agreement with orbiter and lander observations.

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