How does the background atmosphere affect the onset of the runaway greenhouse?

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Fig. 1

OLR as a function of surface temperature for different N₂ partial pressures ( bar) found in the literature (Kopparapu et al. 2014; Goldblatt et al. 2013; Zhang & Yang 2020) or computed in this work using the following existing models: the 1D reverse version of LMD-Generic (also known as kcm1d; Turbet et al. 2019) and PyRADS (Koll & Cronin 2018). Kopparapu et al. (2014) also added 350 ppm of CO₂ to the radiative transfer calculation (Ravi K. Kopparapu, priv. comm.).

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