Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1491z&link_type=abstract
Lunar and Planetary Science, volume 27, page 1491
Other
Mars, Mars: Water Adsorption, Water
Scientific paper
The model of H2O adsorption on basalt that has been used in the literature for years is based on a set of measurements made at pressures and temperatures somewhat higher than appropriate to Mars. Empirical representations of this data have been developed, and used extensively to estimate the total abundance of H2O adsorbed in the regolith, the diffusion scale of H2O over a variety of depths, the behavior of H2O in the diurnal boundary layer, and the extent and distribution of ground ice. We recently reported on the measurement of H2O adsorption onto Mauna Kea palagonite, and found adsorbate densities very different than predicted by the current isotherms. Extrapolation of an unrealistic adsorption isotherm accounts for much of the apparent discrepancy: the empirical adsorption isotherm heretofore used to estimate H2 O adsorption on basalt at Mars-like conditions implicitly assumes adsorbents are homogeneous. Isotherms appropriate to heterogeneous adsorbents are presented, along with new adsorption data at Mars-like conditions. Adsorption onto the regolith, diffusion, and ice nucleation are discussed in light of the new results.
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