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Comment on "Radiative Transfer in CO2-Rich Atmospheres: 1. Collisional Line Mixing Implies a Colder Early Mars"

Abstract : Ozak et al. (2016) claimed that explicitly including the effect of CO2 collisional line mixing in their radiative transfer calculations yield CO2 atmospheres that are more transparent to infrared radiation than when spectra calculations are made using sub-Lorentzian line shapes. This would in particular imply significantly colder surface temperatures (up to 15 K) for early Mars than estimated in previous studies. Here we show that the relative cooling that Ozak et al. (2016) associated to the effect of collisional line mixing is in fact due to a wrong choice of broadening species (air instead of CO2). We then calculated line-by-line spectra of pure CO2 atmospheres using a line-mixing model developed for self-broadened CO2. Using the LMD Generic model (in 1-D radiative-convective mode), we find that calculations made with the proper collisional line mixing model and with sub-Lorentzian line shapes lead to differences between early Mars surface temperatures smaller than 2 K only.
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https://hal-insu.archives-ouvertes.fr/insu-03727045
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Submitted on : Wednesday, July 27, 2022 - 8:35:59 AM
Last modification on : Tuesday, August 2, 2022 - 4:00:10 AM

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M. Turbet, H. Tran. Comment on "Radiative Transfer in CO2-Rich Atmospheres: 1. Collisional Line Mixing Implies a Colder Early Mars". Journal of Geophysical Research: Planets, 2017, 122, pp.2362-2365. ⟨10.1002/2017JE005373⟩. ⟨insu-03727045⟩

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