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| 70 km can be consider above the radiative top of the atmosphere, a natural place to seek restoration of radiative balance. But this exercise neglects the stratospheric cooling that occurs as a result of the increased emission in the strong, central region of the CO2 band. Thus the warming of the troposphere is underpredicted; the exercise at 20 km gives a result closer to (though still less than) predictions by a GCM. | |