Articles | Volume 18, issue 8
Atmos. Chem. Phys., 18, 6057–6073, 2018
https://doi.org/10.5194/acp-18-6057-2018

Special issue: The Polar Stratosphere in a Changing Climate (POLSTRACC) (ACP/AMT...

Atmos. Chem. Phys., 18, 6057–6073, 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 et al.

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AR: Author's response | RR: Referee report | ED: Editor decision
AR by Jens Krause on behalf of the Authors (23 Feb 2018)  Author's response    Manuscript
ED: Referee Nomination & Report Request started (06 Mar 2018) by Martyn Chipperfield
RR by Anonymous Referee #3 (13 Mar 2018)
RR by Eric Ray (19 Mar 2018)
ED: Publish as is (01 Apr 2018) by Martyn Chipperfield
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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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