CO2 non-local thermodynamic equilibrium radiative excitation and infrared dayglow at 4.3 micron: Application to Spectral Infrared Rocket Experiment data

Details CO2 non-local thermodynamic equilibrium radiative excitation and infrared dayglow at 4.3 micron: Application to Spectral Infrared Rocket Experiment data CO2 non-local thermodynamic equilibrium radiative excitation and infrared dayglow at 4.3 micron: Application to Spectral Infrared Rocket Experiment data

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9910409n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. D5, p. 10,409-10,419

Physics

26

Carbon Dioxide, Infrared Spectra, Radiance, Radiative Transfer, Temperature Profiles, Thermodynamic Equilibrium, Vibrational Spectra, Absorption Spectra, Daytime, Earth Atmosphere, Earth Limb, Emission Spectra, Molecular Excitation, Spectrum Analysis

Scientific paper

Infrared radiative excitation in non-local thermodynamic equilibrium (non-LTE) regions of the Earth's atmosphere for the V(sub 3) mode vibrationally excited states of CO2 under sunlit conditions and the resulting 4.3-microns limb radiance are calculated using a line-by-line (LBL) radiative transfer model. Excited-state popluation densities and the corresponding vibrational temperature profiles are calculated for the important emitting states using a model which includes radiative absorption and emission as well as various collisional processes. The quenching of O(D(1)/by N2 has a greater impact on these population densities than has been previously reported in the literature. Integrated radiance in a limb view for the 4.3-microns bands is calculated from the model and compared with sunlit earthlimb measurements obtained by the Spectral Infrared Rocket Experiment (SPIRE). Solar pumping is the dominant excitation process for the 4.3-micron emitting states in the daytime. The major contribution to the total limb radiance for tangent heights of 55-95 km is made by the flourescent states at approximately 3600/cm which absorb sunlight at 2.7 microns and then emit preferentially at 4.3 microns. The predicted radiance is in good agreement with the SPIRE measurements for all tangent heights in the 50- to 130-km range. This is the first detailed comparison of results of a full line-by-line non-LTE radiative transfer calculation with 4.3-microns earthlimb radiance data.

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