Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p31a..07b&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #P31A-07
Physics
5410 Composition, 5464 Remote Sensing, 5470 Surface Materials And Properties, 6225 Mars
Scientific paper
Multiple emission angle observations allow for the mathematical separation of radiative contributions from the Martian surface and atmosphere. This technique is applied to MGS TES data to retrieve surface emissivity and atmospheric opacity spectral shapes as well as refined surface temperatures. Atmospheric water vapor and minor carbon dioxide absorptions are initially removed using calculated synthetic radiances of previously determined abundances. Initial guesses for atmospheric opacity and surface emissivity and temperature are used to calculate radiance spectra using a plane parallel, non-scattering atmospheric model and the temperature profile retrieved from the 15 micron carbon dioxide fundamental absorption. The atmosphere and surface parameters are adjusted iteratively in a non-linear least squares fitting routine until the modeled radiances match measured observations. Results are typically limited to southern hemisphere and equatorial regions because of various natural and artificial constraints, including high surface temperatures, low dust opacity, and timing and locations of targeting. Two categories of surface spectral shapes are retrieved: high albedo surfaces and low albedo surfaces. Low albedo surfaces are consistent with previous atmospheric correction results. Initial analysis indicated that the high albedo regions match the spectral signatures of materials that contain significant quantities of intermediate to calcic plagioclase feldspar. Further study of the spectral response of high albedo surfaces indicates the presence of bound water due to a positive feature at about 6.2 microns. Significant phase function effects are also present that causes a decrease in emissivity with increasing emission angle. Additionally, the unique spectral structure present in high albedo surfaces at wavelengths less than about 7 microns is consistent with small amounts of intermixed carbonate material. Further study is needed to establish that this spectral structure is unique to carbonate materials, however.
Bandfield Joshua L.
Smith Masson D.
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