Articles | Volume 13, issue 6
https://doi.org/10.5194/amt-13-3167-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-13-3167-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
16 Jun 2020
Research article |
| 16 Jun 2020
| 16 Jun 2020
Correcting the impact of the isotope composition on the mixing ratio dependency of water vapour isotope measurements with cavity ring-down spectrometers
Geophysical Institute, University of Bergen, and Bjerknes Centre for Climate Research, Bergen, Norway
Alexandra Touzeau
Geophysical Institute, University of Bergen, and Bjerknes Centre for Climate Research, Bergen, Norway
Harald Sodemann
Geophysical Institute, University of Bergen, and Bjerknes Centre for Climate Research, Bergen, Norway
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Saved (final revised paper)
Latest update: 09 Jun 2026
Short summary
We find that the known mixing ratio dependence of laser spectrometers for water vapour isotope measurements varies with isotope composition. We have developed a scheme to correct for this isotope-composition-dependent bias. The correction is most substantial at low mixing ratios. Stability tests indicate that the first-order dependency is a constant instrument characteristic. Water vapour isotope measurements at low mixing ratios can now be corrected by following our proposed procedure.
We find that the known mixing ratio dependence of laser spectrometers for water vapour isotope...
