Articles | Volume 24, issue 19
https://doi.org/10.5194/acp-24-11005-2024
https://doi.org/10.5194/acp-24-11005-2024
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

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Subject: Gases | Research Activity: Field Measurements | Altitude Range: Troposphere | Science Focus: Physics (physical properties and processes)
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Cited articles

Adnew, G. A., Hofmann, M. E. G., Paul, D., Laskar, A., Surma, J., Albrecht, N., Pack, A., Schwieters, J., Koren, G., Peters, W., and Röckmann, T.: Determination of the triple oxygen and carbon isotopic composition of CO2 from atomic ion fragments formed in the ion source of the 253 Ultra high-resolution isotope ratio mass spectrometer, Rapid Commun. Mass Spectrom., 33, 1363–1380, https://doi.org/10.1002/rcm.8478, 2019. a, b, c
Adnew, G. A., Pons, T. L., Koren, G., Peters, W., and Röckmann, T.: Leaf-scale quantification of the effect of photosynthetic gas exchange on δ17O of atmospheric CO2, Biogeosciences, 17, 3903–3922, https://doi.org/10.5194/bg-17-3903-2020, 2020. a
Adnew, G. A., Workman, E., Janssen, C., and Röckmann, T.: Temperature dependence of isotopic fractionation in the CO2-O2 isotope exchange reaction, Rapid Commun. Mass Spectrom., 36, e9301, https://doi.org/10.1002/rcm.9301, 2022. a
Adnew, G. A., Pons, T. L., Koren, G., Peters, W., and Röckmann, T.: Exploring the potential of Δ17O in CO2 for determining mesophyll conductance, Plant Physiol., 192, 1234–1253, https://doi.org/10.1093/plphys/kiad173, 2023. a, b
Assonov, S. S., Brenninkmeijer, C. A. M., Schuck, T. J., and Taylor, P.: Analysis of 13C and 18O isotope data of CO2 in CARIBIC aircraft samples as tracers of upper troposphere/lower stratosphere mixing and the global carbon cycle, Atmos. Chem. Phys., 10, 8575–8599, https://doi.org/10.5194/acp-10-8575-2010, 2010. a
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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.
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