Non-LTE Effects on Mars: 15μ m CO2 Limb Temperature Retrievals by Season and Latitude

Details Non-LTE Effects on Mars: 15μ m CO2 Limb Temperature Retrievals by Season and Latitude Non-LTE Effects on Mars: 15μ m CO2 Limb Temperature Retrievals by Season and Latitude

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dps....37.3305m&link_type=abstract

American Astronomical Society, DPS meeting #37, #33.05; Bulletin of the American Astronomical Society, Vol. 37, p.693

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Latitudinal averages of MGS/TES observations for a number of Martian seasons are regularly inverted using the 15μ m CO2 infrared band to derive both nadir and limb temperature profiles. Non-LTE (local thermodynamic equilibrium) effects in this CO2 manifold become significant above about 95 km in Mars yet contribute to observed limb radiances at lower tangent altitudes. An inversion routine which assumes LTE and a separate non-LTE routine are used in assessing the effect of non-LTE contributions on the limb retrievals. First, temperature profiles are obtained by using the LTE routine to invert MGS/TES averages. Next, we compute corresponding synthetic spectra by submitting those profiles to our non-LTE algorithm. Finally, by inverting the synthetic spectra via that independent LTE routine, the non-LTE and resulting LTE profiles can be compared. For example, with Ls near 562o and for latitude 35o S, between about 65-80 km tangent-point altitudes, the two profiles progressively diverge with increasing altitude, the non-LTE profile becoming warmer finally by more than 10K. We present results for a suite of latitudes and Martian seasons. A new implementation has significantly reduced computation time for these corrections.
Funding for this research is provided by the NASA Mars Data Analysis Program. We also acknowledge support by NASA for an NAS/NRC Associateship.

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