Observations of periglacial landforms in Utopia Planitia with the High Resolution Imaging Science Experiment (HiRISE)
Abstract
The region of western Utopia Planitia (80-105°E, 40-55°N) displays several types of landforms similar to Earth periglacial features, including scallop-shaped depressions and networks of polygonal terrains. The scalloped depressions have been proposed to originate from thermokarstic processes such as sublimation and/or melting of near-surface ground ice. Using HiRISE imagery, we characterize these depressions and several associated, distinct polygon networks in unprecedented morphologic and topographic detail and investigate support for an ice-based degradation process. The scalloped depressions and interior polygons and ridges are found to evolve together, mainly influenced by sublimation, local proximity of ground ice to the surface, and obliquity variations.
- Publication:
-
Journal of Geophysical Research (Planets)
- Pub Date:
- April 2009
- DOI:
- 10.1029/2008JE003264
- Bibcode:
- 2009JGRE..114.4005L
- Keywords:
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- Planetary Sciences: Solar System Objects: Mars;
- Planetary Sciences: Solid Surface Planets: Surface materials and properties;
- Planetary Sciences: Solid Surface Planets: Physical properties of materials;
- Planetary Sciences: Solid Surface Planets: Remote sensing;
- Planetary Sciences: Solid Surface Planets: Instruments and techniques