In situ measurements of carbon dioxide in the winter Arctic vortex and at midlatitudes - An indicator of the 'age' of stratospheric air

Physics

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Arctic Regions, Carbon Dioxide Concentration, Midlatitude Atmosphere, Stratosphere, Vortices, Atmospheric Composition, Transport Properties, Vertical Distribution, Winter

Scientific paper

New measurements are reported of the vertical CO2 distribution mixing ratio in the lower and middle stratosphere. The annual increase of CO2 content in midstratospheric air is comparable to the temporal CO2 trend in the troposphere, but the stratospheric concentrations lag the tropospheric ones by an average of 5.6 + or - 1.1 yr. This delay time may be interpreted as the 'age' of stratospheric air masses. CO2 observations over the last decade suggest that these processes have varied systematically with a time period of 3-5 yrs.

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