On the Role of Salt in Modifying Local Thickness of Martian Permafrost

Details On the Role of Salt in Modifying Local Thickness of Martian Permafrost On the Role of Salt in Modifying Local Thickness of Martian Permafrost

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p12a0358t&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #P12A-0358

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1823 Frozen Ground, 1829 Groundwater Hydrology, 1832 Groundwater Transport, 3210 Modeling, 6225 Mars

Scientific paper

A previous model of hydrothermal convection in the Martian subsurface (Travis, Rosenberg and Cuzzi, JGR-Planets, in press) indicates that background geothermal heat flux should lead to substantial thinning of the permafrost layer above upwelling convection plumes. That model assumes pure water properties. However, subsurface liquid water is likely to have significant salt content. Salts generally depress the freezing point; e.g., a high salt (NaCl) content can depress water's freezing point by about 20 °C. Further, brine is denser than pure water. These two properties may modify the nature of the predicted hydrothermal circulation, in particular, the amount of thinning of permafrost above upwelling plumes. Two and three dimensional simulations comparing pure water and brine circulation patterns will be presented.

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