Statistics – Methodology
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.1901s&link_type=abstract
American Astronomical Society Meeting 208, #19.01; Bulletin of the American Astronomical Society, Vol. 38, p.99
Statistics
Methodology
Scientific paper
Recent observations with ground-based observatories and the Mars Express spacecraft have been made of methane in the Martian atmosphere with abundances varying from 0 to 35 ppb. The variable concentrations and a short lifetime of 340 years, based on gas-phase chemistry calculations, argue for an indigenous source of the methane. If the source of the methane is subsurface (either though volcanism, biology, or clathrate) the gas must diffuse through the crust. Studying this diffusion can result in a preliminary understanding of the conditions present in the crust. That is, as the pore space available for diffusion becomes filled by water ice, methane migration through it may be restricted, causing the methane to diffuse horizontally until a dry region (with larger pore spaces) is reached where vertical migration resumes. The object of the current work is to characterize the diffusion coefficient to better understand locations of potential sources. A series of experiments where methane is introduced into a column of Martian regolith simulant at different temperatures and pressures will be discussed. The regolith simulant consists of particles with a size and shape distribution consistent with MER measurements; simulants with a range of ice concentrations are examined. The experimental setup and methodology are described, and first results are reported.
Beegle L.
Sollitt Luke
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