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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Latest update: 11 May 2021
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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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