Defrosting Sequence on the Russell
نویسندگان
چکیده
Introduction: Uncommon features have been observed in the cryptic region near the south polar cap during the spring time retreat of the seasonal cap. The defrosting of the seasonal CO2 cap leads to dalmatian spots named dark spots [1], spiders [2], fans [3] and polygonal crack patterns [4]. (Kieffer, 2007) proposed a semiquantitative model to explain all these processes. The dark spots, fans and spiders would be formed by the venting of sub-ice CO2 gas under pressure. This model implies a pure CO2 ice slab responsible of heating and defrosting the basal part of the ice slab by translucency [5]. The high resolution pictures, MOC first, and now HiRiSE, display such uncommon features further north in the southern hemisphere. Indeed, some south facing scarps in middle latitudes are partly frosted during the local winter and recorded the defrosting sequence during the spring time retreat. It is the case of Russell Crater (54.6°S and 12.4°E), a large crater of the southern hemisphere, that exposes a large dune field in its center. The aim of this abstract is to describe the active features produced by the defrosting on the megadune of Russell Crater and to discuss the possible mechanisms that originated of these features.
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