On the microphysical state of the Martian seasonal caps

Details On the microphysical state of the Martian seasonal caps On the microphysical state of the Martian seasonal caps

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..103...43e&link_type=abstract

Icarus (ISSN 0019-1035), vol. 103, no. 1, p. 43-48.

Physics

27

Carbon Dioxide, Grain Boundaries, Grain Size, Mars Surface, Polar Caps, Dust Storms, Seasons, Solidified Gases, Mars, Polar Caps, Seasonal Variations, Carbon Dioxide, Metamorphism, Grain Size, Sintering, Porosity, Deposits, Absorption, Scattering, Spectra, Emissivity, Opacity, Albedo, Frost, Density, Timescale, Condensation, Parameters, Annealing, Layers, Thermal Properties

Scientific paper

An analysis of the microphysical processes involved in pressureless sintering leads to the view that CO2 in the Martian seasonal polar caps can metamorphose into an annealed polycrystalline layer, if freshly condensed grains are smaller than 10 microns. Such large-area/low-porosity CO2 deposits may be associated with the mm-to-cm-scaled path lengths entailed by the explanation of several weak absorption features in the 1.5- and 2.3-micron spectral regions. Such an annealed layer would become transparent enough during the later stages of spring sublimation to establish a basis for the dichotomy between the north and south caps' albedos in the underlying substrate.

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