Articles | Volume 13, issue 6
Atmos. Meas. Tech., 13, 3167–3190, 2020
https://doi.org/10.5194/amt-13-3167-2020
Atmos. Meas. Tech., 13, 3167–3190, 2020
https://doi.org/10.5194/amt-13-3167-2020

Research article 16 Jun 2020

Research article | 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

Yongbiao Weng et al.

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Latest update: 23 Sep 2021
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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.