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Summary

The results show that 2xCO₂-induced cooling reaches ~12K at the stratopause over the tropics for the prescribed ozone simulations. The cooling reaches 14-15 K in the polar stratopause regions where temperature maximum occurs. The incorporation of ozone radiative feedback enhances the solar heating in the summer hemisphere. In the winter hemisphere, enhanced infrared cooling due to ozone can be significant. These combined effects modify the model response to CO₂ doubling throughout the year. In the tropics, the incorporation of ozone radiative feedback reduces the cooling signal by several degrees at the stratopause and up to 4 K around 0.5 hPa. The ozone change is significant throughout the upper stratosphere/lower mesosphere showing a general increase between 10% and 15% in response to %CO₂ doubling. The magnitude of the associated radiative feedback varies with altitude and results in approximately 2K warming for a 10% increase in ozone at the stratopause. In the lower stratosphere, a small ozone reduction and associated cooling is obtained for CO₂ doubling with the ozone interactive model version.