Preprints
https://doi.org/10.5194/egusphere-2024-3009
https://doi.org/10.5194/egusphere-2024-3009
01 Oct 2024
 | 01 Oct 2024
Status: this preprint is open for discussion.

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

Gilles Reverdin, Claire Waelbroeck, Antje Voelker, and Hanno Meyer

Abstract. We illustrate offsets in seawater isotopic composition between the data sets presented in two recent studies and the LOCEAN seawater isotopic composition dataset, as well as other data for the same years and same regions. These comparisons are carried in the surface waters, for one in the North and South Atlantic, and for the other in the subtropical South-East Indian Ocean. The observed offsets between data sets which exceed 0.10 ‰ in δ18O and 0.50 ‰ in δ2H might in part reflect seasonal or spatial variability. However, they are rather systematic, so they likely originate, at least partially, from different instrumentations and protocols used to measure the water samples. They need to be adjusted in order to ultimately merge the different data sets. This highlights the need to actively share seawater isotopic composition samples dedicated to specific intercomparison of data produced in the different laboratories.

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Gilles Reverdin, Claire Waelbroeck, Antje Voelker, and Hanno Meyer

Status: open (until 26 Nov 2024)

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Gilles Reverdin, Claire Waelbroeck, Antje Voelker, and Hanno Meyer
Gilles Reverdin, Claire Waelbroeck, Antje Voelker, and Hanno Meyer

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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 data sets 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 the different laboratories.