Articles | Volume 16, issue 15
Research article
11 Aug 2016
Research article |  | 11 Aug 2016

Seasonal and inter-annual variability of lower stratospheric age of air spectra

Felix Ploeger and Thomas Birner


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Short summary
We investigate the aging of air in the stratosphere caused by transport due to Brewer's circulation, using the Boundary Impulse Evolving Response (BIER) method. The age spectra show multiple peaks caused by the seasonal and inter-annual variations of transport. The modal age is controlled by the residual circulation in the tropics and winter hemisphere extratropics and by mixing in the summer hemisphere. Analysis of the full age spectrum is strongly recommended for model inter-comparisons.
Final-revised paper