(b)Equilibrium temperature response
(a)The time-dependent response of surface air temperature (degrees C) in the coupled ocean-atmosphere model to a 1% per year increase of atmospheric CO2. The difference between the 1% per year perturbation run and years 60-80 of the control run when the atmospheric CO2 concentration approximately doubles is shown.
(b) The equilibrium response of surface air temperature (degrees C) in the atmosphere-mixed layer ocean model to a doubling of atmospheric CO2. IPCC, 1992.