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Water isotopes are widely used as proxies in climate research. However, our understanding of the processes that control their composition is still incomplete. In comparison to other major ocean basins, the Mediterranean Sea is well suited to improve our understanding of the factors influencing oxygen isotope variability and to refine current modelling approaches. This study successfully implemented and simulated stable water isotopes (δ18O and δD) across the Mediterranean basin using the high-resolution NEMO-MED12 dynamical model. The model accurately simulates the well-documented east–west δ18O gradient in Mediterranean water masses. Moreover, the results show a good agreement between simulated and observed δD. δD exhibits a strong linear relationship with δ18O (r2 = 0.98) and salinity (r2 = 0.94) across the Mediterranean basin. Furthermore, the modeled δ18O/salinity relationships align with observations, showing a weaker gradient in the eastern basins compared to the western basins. This development offers significant potential for paleoclimate-related applications.

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High-Resolution Modeling of Water Isotope (δ18O and δD) Distribution in the Mediterranean Sea

  • 会议论文

  • 发表日期：

    2025年

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  • Mohamed Ayache,
  • Jean-Claude Dutay,
  • Anne Mouchet,
  • Kazuyo Tachikawa,
  • Camille Risi,
  • Gilles Ramstein

摘要

Water isotopes are widely used as proxies in climate research. However, our understanding of the processes that control their composition is still incomplete. In comparison to other major ocean basins, the Mediterranean Sea is well suited to improve our understanding of the factors influencing oxygen isotope variability and to refine current modelling approaches. This study successfully implemented and simulated stable water isotopes (δ18O and δD) across the Mediterranean basin using the high-resolution NEMO-MED12 dynamical model. The model accurately simulates the well-documented east–west δ18O gradient in Mediterranean water masses. Moreover, the results show a good agreement between simulated and observed δD. δD exhibits a strong linear relationship with δ18O (r2 = 0.98) and salinity (r2 = 0.94) across the Mediterranean basin. Furthermore, the modeled δ18O/salinity relationships align with observations, showing a weaker gradient in the eastern basins compared to the western basins. This development offers significant potential for paleoclimate-related applications.