Other
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000icar..144..456l&link_type=abstract
Icarus, Volume 144, Issue Icarus, pp. 456-462.
Other
12
Scientific paper
Knowledge about the interior temperatures of the polar caps on Mars is crucial for the understanding of stratigraphy and dynamics of the polar caps. The insolation and thereby the temperatures of the surface are strongly influenced by factors including obliquity, conductivity, and albedo. Basal temperatures are mainly determined by surface temperature, cap thickness, thermal conductivity, and areothermal (Areo, Greek for Mars) heat flux. This paper presents a model for the northern polar cap on Mars, where temperature profiles are determined as a function of orbital parameters (obliquity and eccentricity), thermal conductivity, areothermal heat flux, and cap thickness. Furthermore we will look at the thermal behavior of the upper layer (~100 m) of a martian ice cap. There is strong evidence that the northern polar cap consists mainly of H2O ice. In the model we will treat the cap as that of H2O ice with a high dust content and the possibility for solid CO2 or CO2 clathrates. The temperature model shows that the ice is most likely flowing and that the flow rate oscillates with a time lag of 30-70 Kyrs compared to the surface temperature obliquity oscillation. The possibility for measuring the areothermal heat flux by measuring the temperature in the upper 2 m of the ice cap is not very good, but measurements of temperatures through the top 2 m of the ice could provide valuable information on the conductivity of the ice and thereby the constituents of the Mars ice cap.
Dahl-Jensen Dorthe
Larsen Janus
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