Physics
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3707202d&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 7, CiteID L07202
Physics
12
Planetary Sciences: Solar System Objects: Mars, Planetary Sciences: Solid Surface Planets: Erosion And Weathering, Planetary Sciences: Solid Surface Planets: Hydrology And Fluvial Processes
Scientific paper
Fresh-appearing gully deposits are found at tens of sites in the southern hemisphere of Mars. These deposits have latitudinal and azimuthal dependences similar to the overall preferences of southern-hemisphere gullies, suggesting that most gullies can undergo such events. Definite changes are seen at ten sites, including two previously reported. These include visible modification of gully channels and aprons. Those formation intervals constrained to better than one Mars year tend to include winter and exclude summer, suggesting seasonal activity. This seasonal activity is consistent with proposed models for gully formation driven by CO2 frost, although at least some of the new deposits are probably due to dry granular flow with no volatile involvement. As these deposits are capable of effecting distinct topographic changes to gully aprons and channels, they represent a significant component of recent gully evolution.
Byrne Shane
Diniega Serina
Dundas Colin Morrisey
Martinez-Alonso Sara
McEwen Alfred S.
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