Atmospheric and surface retrievals in the Mars polar regions from the Thermal Emission Spectrometer measurements

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