Statistics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p31c0221a&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #P31C-0221
Statistics
1823 Frozen Ground, 6225 Mars
Scientific paper
High latitude ground ice on Mars may be explained, in part, by thermal stability and the abundance vapor in the Martian atmosphere. Local slopes alter surface and subsurface temperatures substantially, and hence allow ground ice to persist at locations where it would otherwise be unstable. Global statistics of the topography of Mars derived from MOLA are computed, processed, and extrapolated to derive a description of surface roughness on spatial scales to which ground ice should be sensitive. This slope distribution, with a global of Hurst exponent of approximately 0.81, is convolved with the predictions of a new thermal model for the dependence of subsurface ice on slope. We find that due to topographic slopes, ground ice can reside in locations where previous global models predict it to be unstable, down to latitudes of about 25 degrees in both hemispheres. This area includes, for example, the northern Olympus Mons aureole deposits, Hecates Tholus, and Hellas basin. In the highest latitudes slopes reduce the amount of buried ice, while in lower latitudes the ice fraction increases, smoothing the boundary of the ice table.
Aharonson Oded
Schorghofer Norbert
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