Articles | Volume 19, issue 11
https://doi.org/10.5194/acp-19-7627-2019
https://doi.org/10.5194/acp-19-7627-2019
Research article
 | 
07 Jun 2019
Research article |  | 07 Jun 2019

Extratropical age of air trends and causative factors in climate projection simulations

Petr Šácha, Roland Eichinger, Hella Garny, Petr Pišoft, Simone Dietmüller, Laura de la Torre, David A. Plummer, Patrick Jöckel, Olaf Morgenstern, Guang Zeng, Neal Butchart, and Juan A. Añel

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Short summary
Climate models robustly project a Brewer–Dobson circulation (BDC) acceleration in the course of climate change. Analyzing mean age of stratospheric air (AoA) from a subset of climate projection simulations, we find a remarkable agreement in simulating the largest AoA trends in the extratropical stratosphere. This is shown to be related with the upward shift of the circulation, resulting in a so-called stratospheric shrinkage, which could be one of the so-far-omitted BDC acceleration drivers.
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