Early Venus experienced large seasonal and latitudinal insolation redistribution but only modest orbit-averaged flux changes, making atmospheric opacity the dominant control on surface temperature rather than orbital forcing.
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In 1D N2-CO2-H2O model atmospheres, increasing background N2 pressure warms the climate under low CO2 via H2O dilution and under high CO2 via H2O loading, while high N2 induces cooling via Rayleigh scattering that can be overwhelmed by enhanced H2O absorption.
citing papers explorer
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Seasonal Insolation Variability on Early Venus: Implications for Energy Budget
Early Venus experienced large seasonal and latitudinal insolation redistribution but only modest orbit-averaged flux changes, making atmospheric opacity the dominant control on surface temperature rather than orbital forcing.
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Revisiting the greenhouse effect of non-greenhouse gases in the atmospheres of Earth-like planets
In 1D N2-CO2-H2O model atmospheres, increasing background N2 pressure warms the climate under low CO2 via H2O dilution and under high CO2 via H2O loading, while high N2 induces cooling via Rayleigh scattering that can be overwhelmed by enhanced H2O absorption.