Open AccessObservations of periglacial landforms in Utopia Planitia with the High Resolution Imaging Science Experiment (HiRISE)
Author(s) -
Lefort A.,
Russell P. S.,
Thomas N.,
McEwen A. S.,
Dundas C. M.,
Kirk R. L.
Publication year - 2009
Publication title -
journal of geophysical research: planets
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2008je003264
Subject(s) - geology , landform , thermokarst , sublimation (psychology) , polygon (computer graphics) , terrain , geomorphology , astrobiology , permafrost , geophysics , psychology , telecommunications , ecology , oceanography , physics , frame (networking) , computer science , psychotherapist , biology
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.