Dynamic simulations of the north-polar cap of Mars. I. Steady-state scenarios

Details Dynamic simulations of the north-polar cap of Mars. I. Steady-state scenarios Dynamic simulations of the north-polar cap of Mars. I. Steady-state scenarios

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....2268m&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #2268

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Scientific paper

The north-polar cap of Mars consists of the residual ice cap and the underlying layered deposits. It is essentially centered around the geographic pole and rests in a topographic depression which occupies large parts of the northern hemisphere of Mars. It is largely accepted that the cap consists mainly of water ice; however, the amount of mixed-in dust and CO_2 is not known. Currently, the cap has an area of 10^6 {km}^2, a maximum thickness of 3-4 km and a volume of 1.2-1.7×{}10^6 {km}^3 (depending on the isostatic compensation of the ground). This corresponds approximately to half the volume of the terrestrial Greenland ice sheet. Simulations are carried out for the north-polar cap of Mars with the ice-sheet model SICOPOLIS, which computes three-dimensionally the temporal evolution of the ice extent and thickness, flow velocity, temperature, water content and age. For this study, it is assumed that the climatic forcing, which consists of surface accumulation, ablation and temperature, is constant over time. We investigate whether the present configuration of the cap, which is defined by the surface topography derived from Mars Orbiter Laser Altimeter (MOLA) data, can be close to steady-state conditions. Further, we perform parameter studies for the climatic forcing as well as the geothermal heat flux and the dust content of the ice. The sensitivity of the build-up time, the ice volume, the ice thickness and the flow velocity to these parameters is systematically investigated.

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