Vertical profile of temperature [Manabe & Strickler 1964 JAS] Stratosphere: radiative equilibrium Absorption of solar rad. (ozone) - emission of terr. rad. (CO2) = 0 Troposphere: radiative-convective equilibrium Absorption - emission + convective heating (incl. condensation) = 0 Lapse rate is determined by convection (assumed to be constant).