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Collision-induced absorption by N2 near 2.16 µm: Calculations, model, and consequences for atmospheric remote sensing

Abstract : Classical molecular dynamics simulations (CMDS) are used for calculations of the collision-induced absorption (CIA) by pure N2 in the (2.1-2.2 µm) region of the first overtone band. They lead to reasonable (±15%) agreement with the only two laboratory measurements available, at 97 K and room temperature. Based on these experiment/theory comparisons, empirical corrections are made to the CMDS-calculated CIA of pure N2 in the 200-300 K temperature range. In addition, the contribution of N2-O2 collisions is, in the absence of any laboratory measurement, calculated and a simple semiempirical model (the first of its kind) is built in order to predict the CIA of N2 under Earth atmosphere conditions. This is successfully validated by comparisons with ground-based atmospheric transmission spectra in the 2.1-2.2 µm region.
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Submitted on : Thursday, July 21, 2022 - 9:53:45 AM
Last modification on : Tuesday, August 2, 2022 - 4:00:11 AM

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J. -M. Hartmann, C. Boulet, G. C. Toon. Collision-induced absorption by N2 near 2.16 µm: Calculations, model, and consequences for atmospheric remote sensing. Journal of Geophysical Research: Atmospheres, 2017, 122, pp.2419-2428. ⟨10.1002/2016JD025677⟩. ⟨insu-03727078⟩

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