Ocean Science
Ocean Science
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Articles | Volume 22, issue 5
Articles | Volume 22, issue 5
https://doi.org/10.5194/os-22-3225-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-22-3225-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 5
Research article
 | 
20 Oct 2026
Research article |  | 20 Oct 2026

Seasonal cycle in surface seawater isotopic composition

Gilles Reverdin, Claire Waelbroeck, Lola Goeme, Antje H. L. Voelker, and Hans Christian Steen-Larsen

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Short summary
The distributions of water isotopic properties (δ18O, δ2H, deuterium excess) as a function of salinity are studied in the surface Atlantic Ocean and southwest Indian Ocean using the CISE-LOCEAN database. Large spatial gradients are found as well as a seasonal variability in the North Atlantic sub-polar gyre and in the equatorial Atlantic. Spatially averaged seasonal cycles are established in these regions, as well as at the BATS (Bermuda Atlantic Time-series Study) site (31°50' N, 64°10' W).
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