Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p43c1695m&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P43C-1695
Physics
[5464] Planetary Sciences: Solid Surface Planets / Remote Sensing, [6225] Planetary Sciences: Solar System Objects / Mars, [6969] Radio Science / Remote Sensing
Scientific paper
The Painted Desert, AZ has been proposed as an analog site for Mawrth Vallis, Mars [1]. In this study, we compare spectra of the Painted Desert from HyMap, from an ASD spectrometer in the field, and of Painted Desert samples measured in the lab. This comparison will aid in the interpretation of CRISM data by identifying consistent differences between lab measurements, field measurements, and aerial measurements of the same site. Our field sites were located near Five Buttes on Navajo land and at the Teepee site of the Petrified Forest National Park. Rocks in these areas are composed of feldspar, chert, smectite, kaolinite, calcite and dolomite. In comparing our three datasets, the most consistent difference is that the absorption band near 2.2 μm is weaker in the aerial (HyMap) data than both the field and lab data, which are of similar magnitude (Figs. 1 and 2). The weaker bands could be due to the larger footprint of the aerial data (4 m x 4 m), resulting in spectra that may sample a larger variety of materials. The spectral features in the 2-2.5 μm region are due to combinations and overtones of the metal-OH vibration within the mineral structure. That the bands are consistently weaker in the aerial data than the lab and field data could mean that modal estimates based on satellite data from Mars could be underestimating the percentage of phyllosilicates.
Bishop Janice L.
McKeown Nancy K.
Noe Dobrea Eldar Z.
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