Mathematics – Logic
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p14a..08m&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #P14A-08
Mathematics
Logic
5409 Atmospheres: Structure And Dynamics, 6225 Mars, 3322 Land/Atmosphere Interactions, 3307 Boundary Layer Processes, 0305 Aerosols And Particles (0345, 4801)
Scientific paper
The on-going Eldorado Valley Dust Devil Project was expanded this year to include other sites in the Mohave Desert, California, and in northern Nevada on the Black Rock playa. During each field campaign, dust-laden vortices were directly sampled by over 30 instruments on a terrain-following rig that profiled conditions from ground level to over 5m above the surface. On several occasions, dust devils were observed to follow borders between aerodynamically rough (ex. sagebrush or coarse mud-flaked playa surfaces) and smooth terrain (ex. even, undisturbed & undesiccated silt-floored playa surfaces). Regardless of underlying terrain, dust devils rarely formed coherent structure nor could such vortices be sustained when ambient winds dropped below 2 m/s or gusted above 8 m/s (as measured at 2m above ground). Furthermore, vortex formation, rotation, and type were clearly influenced by upstream obstacles, such as range fronts, as much as 10km upwind. Video and high-resolution time-lapse photography are being correlated with the 5 Hz sensor logs to examine the interaction of meteorological conditions (profiled wind speed & direction, pressure, temperature, and humidity) within the vortices. In addition, single-level measurements were recorded for dust impacts and UV occultation (using a sensor suite developed for the Beagle2 Mars Lander), charged particle impacts, and electric fields (horizontal and vertical). These data are still being evaluated. Preliminary results indicate that thermally powered vortices are able to entrain soil material at surprisingly low wind shears and "poorly structured" columns are able to last longer than previously noted. Our research will attempt to decipher the dominant aerodynamic and electric factors that govern dust devil behavior and erosion efficacy.
Balme Matt
Farrell William M.
Fuerstenau Stephen
Greeley Ronald
Merrison Jon
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