Radiation Limits in a Semi-analytical Radiative-Convective Model With Non-gray Absorption

Physics

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1620 Climate Dynamics (3309), 3309 Climatology (1620), 3359 Radiative Processes

Scientific paper

We have investigated the radiation limits of a planetary atmosphere using a simple non-gray radiative-convective model based on Simpson (1928) and on Weaver and Ramanathan (1995). For simplicity, the non-gray approach assumes an atmosphere with gases with constant absorption coefficients in finite-width spectral bands. A single atmospheric window (i.e., region of low absorption) in the infrared spectrum with continuum absorption has been assumed (crudely representing the absorption of water vapor). Analytical and semi-analytical solutions are obtained for an atmosphere in pure radiative and radiative-convective equilibrium, respectively. Multiple equilibrium and both finite and infinite runaway effects are found when applying the condition of liquid-vapor equilibrium. In comparison, a single state and an infinite runaway effect are found in gray atmospheres.

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