Radiative transfer in the middle and upper atmosphere of Earth taking account line-mixing in the IR CO2 bands

Vladimir P. Ogibalov

doi:10.1117/12.2645965

7 December 2022 Radiative transfer in the middle and upper atmosphere of Earth taking account line-mixing in the IR CO₂ bands

Vladimir P. Ogibalov

Author Affiliations +

Proceedings Volume 12341, 28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 123411P (2022) https://doi.org/10.1117/12.2645965
Event: 28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 2022, Tomsk, Russia

Abstract

The non-equilibrium populations of excited vibrational states of the CO₂ molecules in the problem of radiation transfer in infrared bands of carbon dioxide in the middle and upper atmosphere of the Earth are investigated, taking into account changes in the absorption coefficient due to the line-mixing effect. To do this, a carbon dioxide molecule model is used to study non-equilibrium CO₂ emissions in the Earth's atmosphere, which takes into account 206 vibrational states of the 7 isotopologues of CO₂ giving rise 545 radiation vibrational transitions consisting of about 64200 ro-vibrational lines. The line-mixing effect was taken into account only for lines belonging to the spectral range of the 15 μm CO₂ band, using a correction function to the values of the radiation absorption coefficient in this band, which was calculated within framework of the strong collision model with adjusted branch coupling. It is shown that taking into account the deviation of the frequency profile of ro-vibrational transitions in the spectral range of the 15 μm CO₂ band from the sum of Voigt profiles due to the phenomenon of line-mixing leads to only insignificant (less than 2%) changes both in the values of non-equilibrium populations of vibrational states of CO₂ excited in the bending mode of the CO₂ molecule and in the magnitude of the rate of radiative cooling of the atmosphere in the bands of CO₂. The study could be useful for understanding the radiation regime in planetary atmospheres. The results of the work may be used in the development of methods for remote sensing of atmospheric parameters.

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Vladimir P. Ogibalov "Radiative transfer in the middle and upper atmosphere of Earth taking account line-mixing in the IR CO₂ bands", Proc. SPIE 12341, 28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 123411P (7 December 2022); https://doi.org/10.1117/12.2645965

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KEYWORDS

Molecules

Earth's atmosphere

Atmospheric modeling

Infrared radiation

Radiative transfer

Absorption

Atmospheric sensing

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