Algorithm of Non-LTE Infrared Radiation in Atmosphere and Its Application

Jian Wang; Shuaihui Li; Dandan Zeng; Bo Yan; Hao Chen

doi:10.54097/cz58dt73

Authors

Jian Wang
Shuaihui Li
Dandan Zeng
Bo Yan
Hao Chen

DOI:

https://doi.org/10.54097/cz58dt73

Keywords:

Infrared Radiation, Non-local Thermodynamic Equilibrium (non-LTE), Energy Level Population, CO2 Radiation

Abstract

Atmospheric radiation is widely used in the field of space-based detection of spacecraft and atmospheric remote sensing. With the increase of altitude, the air density decreases and the intermolecular collision becomes weaker. As a result, the energy distribution of gas molecules deviates from the equilibrium state, and the radiation transmittance and source function need to be calculated on the basis of the specific non-LTE energy level population. Energy level population is a key and difficult problem in the calculation of non-equilibrium radiation. In this paper, the physical process of molecular energy level transition and radiation transfer is studied, including the relationship between molecular transition, radiation spectrum, radiation transfer and energy level distribution. The numerical algorithm for energy level population calculation is established. The non-equilibrium energy level distribution and limb infrared radiation characteristics of CO2, an important infrared radiation component in the atmosphere, were studied by using the program. The non-equilibrium radiation mechanism of CO2 4.3μm band under different day and night conditions was analyzed. Finally, the model calculation of CO2 4.3μm band under different conditions is compared with the limb observation results, and the reliability of the radiation model, calculation method and program are verified.

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