Articles | Volume 18, issue 8
https://doi.org/10.5194/acp-18-6057-2018
https://doi.org/10.5194/acp-18-6057-2018
Research article
 | 
02 May 2018
Research article |  | 02 May 2018

Mixing and ageing in the polar lower stratosphere in winter 2015–2016

Jens Krause, Peter Hoor, Andreas Engel, Felix Plöger, Jens-Uwe Grooß, Harald Bönisch, Timo Keber, Björn-Martin Sinnhuber, Wolfgang Woiwode, and Hermann Oelhaf

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Latest update: 23 May 2024
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Short summary
We present tracer measurements of CO and N2O measured during the POLSTRACC aircraft campaign in winter 2015–2016. We found enhanced CO values relative to N2O in the polar lower stratosphere in addition to the ageing of this region during winter. By using model simulations it was possible to link this enhancement to an increased mixing of the tropical tropopause. We thus conclude that the polar lower stratosphere in late winter is strongly influenced by quasi-isentropic mixing from the tropics.
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