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Influence of ice rheology and dust content on the dynamics of north-polar cap of Mars

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Title: Influence of ice rheology and dust content on the dynamics of north-polar cap of Mars
Authors: Greve, Ralf Browse this author →KAKEN DB
Mahajan, Rupali A. Browse this author
Keywords: Mars
Mars, climate
Mars, surface
Issue Date: Apr-2005
Publisher: Elsevier Inc.
Journal Title: Icarus
Volume: 174
Issue: 2
Start Page: 475
End Page: 485
Publisher DOI: 10.1016/j.icarus.2004.07.031
Abstract: The evolution and dynamics of the north-polar cap (residual-ice-cap/layered-deposits complex) of Mars is simulated with a thermomechanical ice-sheet model. We consider a scenario with ice-free initial conditions at 5 Ma before present due to the large obliquities which prevailed prior to this time. The north-polar cap is then built up to its present shape, driven by a parameterized climate forcing (surface temperature, surface mass balance) based on the obliquity and eccentricity history. The effects of different ice rheologies and different dust contents are investigated. It is found that the build-up scenarios require an accumulation rate of approximately 0.15–0.2 mm a−1 at present. The topography evolution is essentially independent of the ice dynamics due to the slow ice flow. Owing to the uncertainties associated with the ice rheology and the dust content, flow velocities can only be predicted within a range of two orders of magnitude. Likely present values are of the order of 0.1–1 mm a−1, and a strong variation over the climatic cycles is found. For all cases, computed basal temperatures are far below pressure melting.
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Greve Ralf

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