The History of Ice at the Phoenix Mars Landing Site and Beyond

Details The History of Ice at the Phoenix Mars Landing Site and Beyond The History of Ice at the Phoenix Mars Landing Site and Beyond

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p11c1354s&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P11C-1354

Physics

[5422] Planetary Sciences: Solid Surface Planets / Ices, [6225] Planetary Sciences: Solar System Objects / Mars

Scientific paper

The Phoenix Lander found subsurface water ice buried beneath a layer of dry soil. Most of this ice was pore-ice that fills interstitial voids, but patches of pure ice were also exposed. An accelerated numerical method, specifically developed for this purpose, is used to follow the history of the ice over orbital variations. A surprising result is that the pore-ice layer is expected to be extremely thin. Thus, the observed patches of pure ice may be exposures of an underlying ice layer. The same model is also used to understand the presence of pure ice, excavated by impacts, further equatorward than previously predicted. Small dust content and relatively recent snowfall can explain the presence of shallow ice at these latitudes. These model results differ in significant ways from predictions based on vapor equilibrium between subsurface ice and atmosphere.

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