Technical note: Large offsets between different datasets  of seawater isotopic composition – an illustration  of the need to reinforce intercalibration efforts

Reverdin, Gilles; Waelbroeck, Claire; Voelker, Antje H. L.; Meyer, Hanno

doi:https://doi.org/10.5194/os-21-567-2025

Articles | Volume 21, issue 2

https://doi.org/10.5194/os-21-567-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/os-21-567-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 21, issue 2

Technical note

|

07 Mar 2025

Technical note |

| 07 Mar 2025

Technical note: Large offsets between different datasets of seawater isotopic composition – an illustration of the need to reinforce intercalibration efforts

Gilles Reverdin, Claire Waelbroeck, Antje H. L. Voelker, and Hanno Meyer

Data sets

Water isotopes of sea water analyzed since 1998 at LOCEAN, (version Wisotopes-V4) Waterisotopes-CISE-LOCEAN https://doi.org/10.17882/71186

Short summary

Water isotopes in the ocean trace the freshwater exchanges between the ocean, the atmosphere, and the cryosphere and are used to investigate processes of the hydrological cycle. We illustrate offsets in seawater isotopic composition between different datasets that are larger than the expected variability that one often wants to explore. This highlights the need to share seawater isotopic composition samples dedicated to specific intercomparison of data produced in different laboratories.