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- W3025263643 abstract "Received 26 February 2008; revised 12 June 2008; accepted 31 July 2008; published 31 October 2008. [1] Retrievals of atmospheric temperatures, surface emissivities, and dust opacities in the Mars polar regions from the Thermal Emission Spectrometer (TES) spectra are presented. The retrievals correspond to two types of spectra, characterized by small and large band depths BD25 in the 25-mm band of solid CO2. These two types of spectra have previously been identified with locations covered by slab ice and fluffy CO2 frost, respectively. Above the first atmospheric scale height, there is a correlation between the degree of saturation in the retrieved atmospheric temperatures and the two types of surface, with the high BD25 spectra (‘‘cold spots’’) showing larger supersaturations around 1 mbar. This supports the hypothesis that coldspotscorrespondtolocationswithpotentialor actual atmospheric precipitation. Furthermore, the retrieved temperature profiles exhibit a warming above 1 mbar (15 km), which appears real even when the limited number of independent pieces of information from the measurement (� 3) and coarse vertical resolution of the TESinstrumentabove 15 kmare considered.The spectralshape ofthe retrievedsurface emissivities in the cold spot locations is consistent with modeling results attributing high BD25 to porosity. For the low BD25 spectra, the retrieved emissivities are spectrally flat but significantly less than unity (0.8–0.9). The cause of these spectrally uniform deviations from blackbody behavior (which are not supported by modeling) remains to be investigated, with a noticeable reduction in the deviation from the blackbody behavior achieved through a zero-radiance-level correction to the TES spectra available from the Planetary Data System." @default.
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- W3025263643 date "2008-11-01" @default.
- W3025263643 modified "2023-09-23" @default.
- W3025263643 title "Atmospheric and Surface Retrievals in the Mars Polar Regions from the Thermal Emission Spectrometer Measurements" @default.
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