Interannual variations in the Δ(17O) signature of atmospheric CO2 at two mid-latitude sites suggest a close link to stratosphere–troposphere exchange

Steur, Pharahilda M.; Scheeren, Hubertus A.; Koren, Gerbrand; Adnew, Getachew A.; Peters, Wouter; Meijer, Harro A. J.

doi:https://doi.org/10.5194/acp-24-11005-2024

Articles | Volume 24, issue 19

https://doi.org/10.5194/acp-24-11005-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-24-11005-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 24, issue 19

Research article

|

01 Oct 2024

Research article |

| 01 Oct 2024

Interannual variations in the Δ(¹⁷O) signature of atmospheric CO₂ at two mid-latitude sites suggest a close link to stratosphere–troposphere exchange

Pharahilda M. Steur, Hubertus A. Scheeren, Gerbrand Koren, Getachew A. Adnew, Wouter Peters, and Harro A. J. Meijer

Data sets

Interannual variations in the Δ17O signature of atmospheric CO2 at two mid-latitude sites suggest a close link to stratosphere-troposphere exchange P. Steur et al. https://doi.org/10.34894/1XJG1F

Short summary

We present records of the triple oxygen isotope signature (Δ(¹⁷O)) of atmospheric CO₂ obtained with laser absorption spectroscopy from two mid-latitude stations. Significant interannual variability is observed in both records. A model sensitivity study suggests that stratosphere–troposphere exchange, which carries high-Δ(¹⁷O) CO₂ from the stratosphere into the troposphere, causes most of the variability. This makes Δ(¹⁷O) a potential tracer for stratospheric intrusions into the troposphere.