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<p><strong>Abstract.</strong> In response to global warming, the Brewer&ndash;Dobson circulation in the stratosphere is expected to accelerate and the mean transport time of air along this circulation to decrease. This would imply a negative stratospheric age of air trend, i.e. an air parcel would need less time to travel from the tropopause to any point in the stratosphere. Age of air as inferred from tracer observations, however, shows zero to positive trends in the northern mid-latitudedoi:10.5194/acp-17-11177-2017 fatcat:w6ot6s2h4fbnva3zav7nicyrfq