Articles | Volume 20, issue 21
Atmos. Chem. Phys., 20, 12391–12408, 2020
https://doi.org/10.5194/acp-20-12391-2020
Atmos. Chem. Phys., 20, 12391–12408, 2020
https://doi.org/10.5194/acp-20-12391-2020

Research article 30 Oct 2020

Research article | 30 Oct 2020

Gravitational separation of Ar∕N2 and age of air in the lowermost stratosphere in airborne observations and a chemical transport model

Benjamin Birner et al.

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AR: Author's response | RR: Referee report | ED: Editor decision
AR by Svenja Lange on behalf of the Authors (22 Jun 2020)  Author's response    Manuscript
ED: Publish subject to minor revisions (review by editor) (06 Jul 2020) by Andreas Engel
AR by Benjamin Birner on behalf of the Authors (06 Jul 2020)  Author's response    Manuscript
ED: Publish subject to minor revisions (review by editor) (24 Jul 2020) by Andreas Engel
AR by Benjamin Birner on behalf of the Authors (27 Jul 2020)  Author's response    Manuscript
ED: Publish as is (10 Aug 2020) by Andreas Engel
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Short summary
With new high-precision observations from nine aircraft campaigns and 3-D chemical transport modeling, we show that the argon-to-nitrogen ratio (Ar / N2) in the lowermost stratosphere provides a useful constraint on the “age of air” (the time elapsed since entry of an air parcel into the stratosphere). Therefore, Ar / N2 in combination with traditional age-of-air indicators, such as CO2 and N2O, could provide new insights into atmospheric mixing and transport.
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