Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27...25a&link_type=abstract
Lunar and Planetary Science, volume 27, page 25
Computer Science
General Circulation Model (Gcm), Mars, Sand Transport, Surface Processes
Scientific paper
The presence of dunes on Mars shows that saltating sand plays an important role in the evolution of the planet's surface. Although previous work focused on dust transport, numerous studies demonstrate that sand is substantially easier to transport by wind. Indirect evidence suggests that saltation may be currently active; however, definitive evidence is lacking. An improved iterative sand transport algorithm was developed based on an earlier model and use of an improved Mars General Circulation Model. The geometry of sand erosion and deposition are dependent on many factors, including the stress threshold required to move sand, sand sources, and potential sand trapping. The new sand transport model takes these factors into account and can be used to predict areas of sand erosion or accumulation. Results are then compared to observed surface features, such as dune fields, sites of dust storm locations, and properties of the surface derived from Viking IRTM data. Runs indicate: 1) net sand transport is from the northern hemisphere to the southern hemisphere, 2) northern plains erosion is prevalent, and 3) sand accumulates in the north polar region.
Anderson Scott F.
Greeley Ronald
Lo Edwin
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