535-15+535.233 Modeling of emission spectral properties of thermally nonequilibrium CO2 gas in the range from 2000 to 2500 cm-1 in planetary atmospheres

Molchanov A. M. (Moscow Aviation Institute (National Research University)), Frolova Y. V. (Moscow Aviation Institute (National Research University)), Kharchenko N. A. (Central Aerohydrodynamic Institute (TsAGI)/MEPhI/Moscow Aviation Institute (National Research University))

ATMOSPHERIC MONITORING, CO2 EMISSIVITY, STATISTICAL NARROWBAND MODEL, THERMAL NONEQUILIBRIUM


doi: 10.18698/2309-3684-2025-3-1531


The paper presents a calculation technique for the absorption and emission characteristics of CO2 in the range from 2000 to 2500 cm-1 taking into account the effect of thermal nonequilibrium. A series of calculations were performed using the line — by — line (LBL) model and the statistical narrow-band model (SNB). The calculations were performed at different ratios of the translational, rotational and vibrational temperatures of the CO2 layer. The resulting technique shows good agreement between the LBL and SNB models, and agrees satisfactorily with the experimental data when calculating the transmittance value. In the range under consideration, the nonequilibrium in the symmetric/deformation mode has virtually no effect on the emission characteristics, unlike the asymmetric vibrational temperature, which has a significant effect on the value of the nonequilibrium Planck function.


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Молчанов А. М., Фролова Ю. В., Харченко Н. А. Моделирование эмиссион-ных спектральных свойств термически неравновесного газа CO2 в диапазоне от 2000 до 2500 см-1 в атмосферах планет. Математическое моделирование и численные методы, 2025, № 3, с. 15–31



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