Physics
Scientific paper
May 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970saosr.314.....p&link_type=abstract
SAO Special Report #314 (1970)
Physics
Scientific paper
A thermogravimetric analysis of the decomposition of goethite-rich samples of limonite and measurement of the equilibrium vapor pressure of the water physically bound in the sample are performed. The heats of sorption for the physically bound component are determined; an activation energy of 29 +/- 3 cal/mole is found between 225° and 390° C. The goethite-hematite reaction is of order 1/2, reasonable for the powders used. The results imply that physical sorption will tend to take place Preferentially over condensation. This tends on Mars to inhibit the formation of a water polar cap. The atmospheric water-vapor pressure should vary with the seasons because of the temperature dependence of physical sorption. Since the amount of this variation seems to be in accord with the spectroscopic observations, an alternative exists to the hypothesis that the greater water-vapor partial pressure in the spring hemisphere indicates meridional transport of water vapor and a ice polar cap. Because of their superior topographical resolution, spacecraft correlations of temperature and water-vapor abundance seem to be the most promising tool for establishing whether sorption or condensation controls the seasonal and topographical variation in the atmospheric water-vapor content.
Khare Bishun N.
Pitman Damien
Pollack James B.
Sagan Carl
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