Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p13a0152h&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P13A-0152
Physics
5405 Atmospheres (0343, 1060), 5410 Composition (1060, 3672), 5464 Remote Sensing, 5470 Surface Materials And Properties, 6281 Titan
Scientific paper
The surface of Titan is obscured by the scattering and absorption of abundant haze aerosols in the visible and near infrared, and by significant absorption by atmospheric methane throughout the infrared. This has been shown by telescopic measurements as well as by the large number of spectral images returned by the Visual and Infrared Mapping Spectrometer (VIMS) on the Cassini Saturn orbiter. The effect of the aerosols decreases toward longer wavelengths, allowing the clear imaging of surface terrains through methane windows at 2 and 5 μm. However, the combination of absorption and scattering in the windows has made it difficult to determine surface albedos accurately, especially since most of the windows occur in the shortwave infrared below 2 μm (0.9, 1.1, 1.3, 1.6 μm), where the aerosol scattering is large. The retrieval of only approximate surface albedos with only one point per infrared window made using both telescopic and VIMS data has limited the ability to study the surface composition, finding only that the visually dark terrain spectra are consistent with dirty water ice. In an effort to improve the accuracy of the window albedos, as well as retrieving surface reflectance at several adjacent VIMS wavelengths in each window, we have adopted an existing radiative transfer model appropriate for inhomogeneous atmospheres that utilizes the latest low-temperature correlated-K laboratory coefficients for methane, pressure-induced nitrogen absorptions, and the latest Titan aerosol optical properties determined by the Huygens probe and multiple remote-sensing Cassini Orbiter instruments. We will show preliminary results from this modeling effort.
Baines Kevin Hays
Buratti Bonnie Jean
Hansen Gary B.
McCord Th. B.
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