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S. L. Lawson (Los Alamos National Laboratory), B. M. Jakosky (Laboratory for Atmospheric and Space Physics)
With the completion of the calibration of the Clementine long-wave infrared (LWIR) camera images, the temperature information can be used in conjunction with other data sets to investigate the properties which control lunar surface temperatures. In an effort to understand the influence of large-scale topography on remote lunar surface measurements, a model was constructed which calculates the correlation between reflectance and temperature for a macroscopically rough surface with varying albedo. LWIR temperatures were then directly compared to Clementine ultraviolet-visible (UVVIS) camera 750-nm reflectances. The lunar surface response in different highland and mare locations was explored as a function of varying phase angle. At very low phase angles, the variation in single-scattering albedo primarily governs the temperature and reflectance response regardless of the presence of topography. As the phase angle increases, the influence of surface roughness grows. Finally, at moderate to high phase angles, the affect of surface roughness dominates. In the absence of large-scale topography, the variation in single-scattering albedo governs the temperature and reflectance response of the lunar surface at all phase angles. LWIR-measured temperature variations yield local topographic information at high incidence angles that is unavailable via the reflectance, while UVVIS-measured reflectance variations yield local topographic information at low incidence angles that is unavailable via the temperature.
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