CO2 Non-Local Thermodynamic Equilibrium Radiative Excitation and Infrared Dayglow at 4.3 micro: Application to Spectral Infrared Rocket Experiment Data
Abstract
Infrared radiative excitation in non-local thermodynamic equilibrium (non-LTE) regions of the Earth's atmosphere for the v%- mode vibrationally excited states of CO2 under sunlit conditions and the resulting 4.3 micro-%un limb radiance are calculated using a line- y-line (LBL) radiative transfer model. Excited-state population 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) by N2 has a greater impact on these population densities than has been previously reported in literature. Integrated radiance in a limb view for the 4.3 ttm 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-% emitting states in the daytime. This is the is first detailed comparison of results of a full line-by-line non-LTE radiative transfer calculation with 4.3-micro earthlimb radiance data.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 20, 1994
- Accession Number
- ADA351079
Entities
People
- Henry Nebel
- Jeremy R. Winick
- Peter P. Wintersteimer
- R. H. Pichard
- Ramesh D. Sharma
Organizations
- Phillips Laboratory