Physics
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mpse.conf..100k&link_type=abstract
International Conference on Mars Polar Science and Exploration, p. 100
Physics
1
Carbon Dioxide, Clathrates, Hydrates, Mars (Planet), Mars Atmosphere, Mars Environment, Spectroscopy, Stability, Surface Properties, Compressibility, Stoichiometry, Computerized Simulation, Diffraction, Electron Microscopy, Physical Chemistry, Porosity, Thermal Conductivity
Scientific paper
A report on laboratory work will be given which has established the formation conditions Of CO2 clathrate hydrates, their (meta)stability and their physicochemical properties under Martian conditions. Specifically, the stability limits in p-T space will be presented, quantitative information on the formation and decomposition kinetics as well as numbers for important physical and microstructural quantities (stoichiometry, density, compressibility, thermal conductivity, porosity, specific surface, spectroscopic properties for remote sensing) will be given. From our laboratory experiments (physico-chemical work, diffraction, spectroscopy, electron microscopy and computer simulations) we conclude that CO2 clathrate hydrates are stable under Martian polar surface and sub-surface (regolith) conditions and we give some suggestions for a detection of CO2 clathrate hydrate in the presence of CO2 and water ice. The slow formation and decomposition kinetics found to be on a timescale of many hours to days mean that local p-T conditions averaged over the diurnal cycles are relevant for clathrate hydrate stability on Mars. Finally, we discuss the possible role Of CO2 clathrate hydrate at present and in the history of Mars.
Klapproth Alexander
Kuhs Werner F.
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