Retrieval of mesospheric and lower thermospheric kinetic temperature from measurements of CO2 15 μm earth limb emission under non-LTE conditions

Details Retrieval of mesospheric and lower thermospheric kinetic temperature from measurements of CO2 15 μm earth limb emission under non-LTE conditions Retrieval of mesospheric and lower thermospheric kinetic temperature from measurements of CO2 15 μm earth limb emission under non-LTE conditions

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.1391m&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 7, p. 1391-1394

Physics

89

Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Pressure, Density, And Temperature, Meteorology And Atmospheric Dynamics: Radiative Processes, Meteorology And Atmospheric Dynamics: Remote Sensing

Scientific paper

We present a new algorithm for the retrieval of kinetic temperature in the terrestrial mesosphere and lower thermosphere from measurements of CO2 15 μm earth limb emission. Non-local-thermodynamic-equilibrium (non-LTE) processes are rigorously included in the new algorithm, necessitated by the prospect of satellite-based limb radiance measurements to be made from the TIMED/SABER platform in the near future between 15 km and 120 km tangent altitude. The algorithm requires 20 seconds to retrieve temperature to better than 3 K accuracy on a desktop computer, easily enabling its use in operational processing of satellite data. We conclude this letter with a study of the sensitivity of the retrieved temperatures to parameters used in the non-LTE models, including sensitivity to the rate constant for physical quenching of CO2 bending mode vibrations by atomic oxygen.

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