CRISM Retrieval of Surface Lambert Albedos for Multispectral Mapping of Mars with DISORT- based Radiative Transfer Modeling: Phase 1 -- Using Historical Climatology for Temperatures, Aerosol Optical Depths, and Atmospheric Pressures

HR: 1340h
AN: P23A-1088 [Abstracts]
TI: CRISM Retrieval of Surface Lambert Albedos for Multispectral Mapping of Mars with DISORT- based Radiative Transfer Modeling: Phase 1 -- Using Historical Climatology for Temperatures, Aerosol Optical Depths, and Atmospheric Pressures
AU: * McGuire, P C
EM: mcguire@wunder.wustl.edu
AF: McDonnell Center for the Space Sciences, Washington University in St. Louis, Campus Box 1169, 1 Brookings Dr, St. Louis, 63130,
AU: Wolff, M J
AF: Space Science Institute, 4750 Walnut Street, Boulder, 80301,
AU: Smith, M D
AF: NASA/GSFC, 8800 Greenbelt Rd, Greenbelt, 20771,
AU: Arvidson, R E
AF: McDonnell Center for the Space Sciences, Washington University in St. Louis, Campus Box 1169, 1 Brookings Dr, St. Louis, 63130,
AU: Murchie, S L
AF: Applied Physics Lab, JHU, 11100 J. Hopkins Rd, Laurel, 20723,
AU: Clancy, R T
AF: Space Science Institute, 4750 Walnut Street, Boulder, 80301,
AU: Roush, T L
AF: NASA/Ames, MS 245-3, Moffett Field, 94035,
AU: Cull, S C
AF: McDonnell Center for the Space Sciences, Washington University in St. Louis, Campus Box 1169, 1 Brookings Dr, St. Louis, 63130,
AU: Lichtenberg, K A
AF: McDonnell Center for the Space Sciences, Washington University in St. Louis, Campus Box 1169, 1 Brookings Dr, St. Louis, 63130,
AU: Wiseman, S M
AF: McDonnell Center for the Space Sciences, Washington University in St. Louis, Campus Box 1169, 1 Brookings Dr, St. Louis, 63130,
AU: Green, R N
AF: NASA/JPL, 4800 Oak Grove Dr, Pasadena, 91109,
AU: Martin, T Z
AF: NASA/JPL, 4800 Oak Grove Dr, Pasadena, 91109,
AU: Milliken, R E
AF: NASA/JPL, 4800 Oak Grove Dr, Pasadena, 91109,
AU: Milliken, R E
AF: Dept of Geological Sciences, Brown Univ., Box 1846, Providence, 02912,
AU: Cavender, P J
AF: Applied Physics Lab, JHU, 11100 J. Hopkins Rd, Laurel, 20723,
AU: Humm, D C
AF: Applied Physics Lab, JHU, 11100 J. Hopkins Rd, Laurel, 20723,
AU: Seelos, F P
AF: Applied Physics Lab, JHU, 11100 J. Hopkins Rd, Laurel, 20723,
AU: Seelos, K D
AF: Applied Physics Lab, JHU, 11100 J. Hopkins Rd, Laurel, 20723,
AU: Taylor, H W
AF: Applied Physics Lab, JHU, 11100 J. Hopkins Rd, Laurel, 20723,
AU: Ehlmann, B L
AF: Dept of Geological Sciences, Brown Univ., Box 1846, Providence, 02912,
AU: Mustard, J F
AF: Dept of Geological Sciences, Brown Univ., Box 1846, Providence, 02912,
AU: Pelkey, S M
AF: Dept of Geological Sciences, Brown Univ., Box 1846, Providence, 02912,
AU: Pelkey, S M
AF: GeoEye, Inc., 12076 Grant St, Thornton, 80241,
AU: Titus, T N
AF: US Geological Survey, 2255 N Gemini Dr, Flagstaff, 86001,
AU: Hash, C D
AF: Applied Coherent Technology Corp., 112 Elden St, Herndon, 20170,
AU: Malaret, E R
AF: Applied Coherent Technology Corp., 112 Elden St, Herndon, 20170,
AU: Team, C
AB: The CRISM hyperspectral imaging spectrometer has been acquiring data from its platform on MRO since September 2006. The data consists of both: (i) hyperspectral targeted observations with high spatial resolution (~18 m/pixel) and 544 spectral channels, and (ii) multispectral (MSP) mapping strips with lower spatial resolution (~200 m/pixel) and 72 spectral channels. The spectral coverage for both modes of observation is 0.362-3.920 μm. Herein, we discuss the DISORT-based radiative transfer system ('CRISM_LambertAlb') for atmospheric and thermal correction of the MSP mapping-mode data, which is being processed in a pipeline fashion. Currently, in this phase-one version of the system, we use aerosol optical depths, surface temperatures, and lower-atmospheric temperatures, all from climatology based upon data from MGS/TES, and surface altimetry from MGS/MOLA. The DISORT-based model takes as input the dust and ice aerosol optical depths (scaled to the CRISM wavelength range), the surface pressures (computed from MOLA altimetry, TES lower-atmospheric thermometry, and Viking-based pressure climatology), the surface temperatures, the reconstructed instrumental photometric angles, and the measured I/F spectrum, and then it outputs a Lambertian albedo spectrum. After discussing the capabilities and limitations of the pipeline software system CRISM_LambertAlb, we then demonstrate its application on several multispectral data cubes -- particularly, the outer reaches of the northern ice cap, the interior layered deposits in Juventae Chasma, the Tyrrhena Terra area northeast of the Hellas basin, and the Phoenix landing site area in the northern plains. For the icy spectra near the northern ice cap, aerosols need to be included in order to properly correct for the CO₂ absorption in the H₂O ice bands at wavelengths near 2.0 microns. For the ILDs in Juventae Chasma, the correction of the photometric angles for slopes is necessary in order to more robustly locate hydrated sulfates with the spectral summary parameters. In future phases of software development, we intend to use CRISM data directly in order to retrieve the climatological spatiotemporal maps of aerosol optical depths, surface pressure and surface temperature. This will allow a second level of refinement in the atmospheric and thermal correction of CRISM multispectral data.
DE: 5405 Atmospheres (0343, 1060)
DE: 5464 Remote sensing
DE: 5494 Instruments and techniques
SC: Planetary Sciences [P]
MN: 2007 Fall Meeting