Observations of High Altitude CO2 Hot Bands in Mars Global Surveyor TES Limb Tangent Spectral Averages

Details Observations of High Altitude CO2 Hot Bands in Mars Global Surveyor TES Limb Tangent Spectral Averages Observations of High Altitude CO2 Hot Bands in Mars Global Surveyor TES Limb Tangent Spectral Averages

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.5125m&link_type=abstract

American Astronomical Society, DPS Meeting #32, #51.25; Bulletin of the American Astronomical Society, Vol. 32, p.1098

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Scientific paper

The MGS/TES instrument has now been in orbit for about 1.5 Martian years. Using respectively 6.45 and 12.5 cm-1 resolution observations from late Martian winter (Ls = 323o) to minimize the water vapor content, we have produced long-tangent-path limb spectral averages for one of six available detectors over successive 5 km vertical extents, beginning at 15-20 km. All of these averages show the strong 15μ m CO2 fundamental. At lower altitudes, as expected the broad 850-1300 cm-1 dust contribution to the limb radiance obscures other features in this extended spectral region. This is consistent with models of vertical dust profiles which, however, show a rapid decrease in dust concentration above 3-4 scale heights ( ~ 40 km). Features at both 10.4 and 9.5μ m are readily observed in the 35-40 km average. The former feature we identify as a CO2 hot band while the latter is comprised partly of another CO2 hot band. The ~ 100 cm-1 wide feature at 9.5μ m is visible in both low and intermediate resolution averages. Since this feature first becomes readily apparent in the 35-40 km average and is narrower than the broad dust contribution, we conclude it's not integral with the broad dust feature. On the other hand, the 9.5μ m feature is wider than can be accounted for by modeling the adjacent CO2 9.4μ m hot band. We will discuss the 9.5μ m feature in more detail. This work was supported in part by NASA's Mars Data Analysis Program.

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