Measurements of thermal properties of icy Mars regolith analogs

Details Measurements of thermal properties of icy Mars regolith analogs Measurements of thermal properties of icy Mars regolith analogs

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jgre..11703001s&link_type=abstract

Journal of Geophysical Research, Volume 117, Issue E3, CiteID E03001

Other

Physical Properties Of Rocks: Thermal Properties, Planetary Sciences: Solid Surface Planets: Ices, Planetary Sciences: Solid Surface Planets: Physical Properties Of Materials, Planetary Sciences: Solid Surface Planets: Polar Regions, Planetary Sciences: Solar System Objects: Mars

Scientific paper

In a series of laboratory experiments, we measure thermal diffusivity, thermal conductivity, and heat capacity of icy regolith created by vapor deposition of water below its triple point and in a low pressure atmosphere. We find that an ice-regolith mixture prepared in this manner, which may be common on Mars, and potentially also present on the Moon, Mercury, comets and other bodies, has a thermal conductivity that increases approximately linearly with ice content. This trend differs substantially from thermal property models based of preferential formation of ice at grain contacts previously applied to both terrestrial and non-terrestrial subsurface ice. We describe the observed microphysical structure of ice responsible for these thermal properties, which displaces interstitial gases, traps bubbles, exhibits anisotropic growth, and bridges non-neighboring grains. We also consider the applicability of these measurements to subsurface ice on Mars and other solar system bodies.

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