Other
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10614667z&link_type=abstract
Journal of Geophysical Research, Volume 106, Issue E7, p. 14667-14674
Other
20
Planetology: Solid Surface Planets
Scientific paper
Observations of the Martian planetary boundary layer lead to interpretations that are baffling and contradictory. In this paper we specifically address the question of whether or not water vapor finds a substantial diurnal reservoir in the Martian regolith. To address this issue, we have measured H2O adsorption kinetics on SWy-1, a Na-rich montmorillonite from Wyoming. The highest-temperature (273 K) data equilibrate rapidly. Data gathered at realistic H2O partial pressures and temperatures appropriate to early morning show two phenomena that preclude a significant role for smeclites in diurnally exchanging a large column abundance. First, the equilibration timescale is longer than a sol. Second, the equilibrium abundances are a small fraction of that predicted by earlier adsorption isotherms. The explanation for this phenomenon is that smeclite clay actually increases its surface area as a function of adsorptive coverage. At Mars-like conditions we show that the interlayer sites of smeclites are likely to be unavailable.
Howard Jeanie D.
Quinn Richard C.
Zent Aaron P.
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