Other
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phdt........34b&link_type=abstract
Thesis (PhD). ARIZONA STATE UNIVERSITY, Source DAI-B 61/02, p. 742, Aug 2000, 195 pages.
Other
Scientific paper
Several methods and techniques are developed to characterize and separate the Martian atmosphere and determine the distributions and mineralogies of surfaces on Mars and Earth. Factor analysis and target transformation techniques are tested on synthetic spectral mixtures and are used to characterize Martian atmospheric water ice and dust using data returned from the Thermal Emission Spectrometer (TES). Water ice and dust spectral shapes are retrieved accurately and do not change significantly over time. Factor analysis indicates that the Martian surface and atmospheric components are combining linearly in the TES spectra. These methods are also tested in the Ephrata Fan to separate basaltic and granodioritic components in dune sands of Central Washington. These compositions are linked to the original bedrock units from which the catastrophic outflow deposits were derived. Using the constant and linear properties of the Martian atmospheric components, two separate methods for separating surface and atmospheric spectral signatures are developed for use with the TES data. Both methods provide consistent surface spectral signatures with each other over variable atmospheric conditions. The atmospheric correction algorithms were used to recover Martian surface spectra globally, indicating the dominance of two spectral signatures in Martian dark regions; a basaltic surface dominated by plagioclase and clinopyroxene and an andesitic surface dominated by plagioclase and volcanic glass. The andesitic surfaces display the highest concentrations in the younger northern lowlands while the basaltic surfaces are confined to the older southern highlands.
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