Mathematics – Logic
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6708b&link_type=abstract
American Astronomical Society, DPS meeting #38, #67.08; Bulletin of the American Astronomical Society, Vol. 38, p.620
Mathematics
Logic
Scientific paper
Recent results from NASA's Mars Exploration Rovers (MER) and the ESA Mars Express OMEGA investigation have demonstrated the widespread role of sulfate minerals as the key marker in aqueous / chemical processes on Mars. The Spirit rover confirmed earlier discoveries by Viking and Pathfinder that sulfates are generally enriched in the Martian crust with sulfate abundances ranging from 5-15%. Orbital remote sensing of sulfates has provided a new perspective on the surface sulfate distribution but has also left major unanswered questions, such as the sulfate mineralogy associated with bright soils and duracrust formation. Specific sulfate mineralogy can be used to determine the geologic origin of these globally distributed sulfates. Possible modes of origins include aqueous and volcanic aerosols.
Ground based observations in the 4-5 μm wavelength region offer a way of detecting and mapping sulfates via absorption from the 2? overtone of the SO4 -2 anion near 4.5 μm. This wavelength region on Mars is problematic since surface absorption features are partially masked by numerous absorption bands from CO2, CO, and O3 in the Martian atmosphere. Moreover, reflected solar and thermal emission from surface and atmosphere contribute in roughly equal amounts at these wavelengths
On Oct 25, 2005 we obtained multiple spectral image cubes spanning this wavelength range using SPEX at the NASA Infrared Telescope Facility. This high quality data set permits us to explore sulfate mineralogy globally and regionally via a combination of forward modeling and least-squares retrievals, utilizing new laboratory measurements of sulfate minerals. Additional constraints are imposed by existing compositional data sets (orbital, in situ, and ground-based). We summarize the results of our ongoing analysis of this data set. This work is being carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract to NASA.
Bjorker G.
Blaney Diana
Glenar David
Maguire W.
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