| Autor: |
Ayache, Mohamed, Dutay, Jean-Claude, Mouchet, Anne, Tachikawa, Kazuyo, Risi, Camille, Ramstein, Gilles |
| Předmět: |
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| Zdroj: |
Geoscientific Model Development Discussions; 1/10/2024, p1-33, 33p |
| Abstrakt: |
Stable water isotopes (δ18 Osw and δD) have been successfully implemented for the first time in a high-resolution model of the Mediterranean sea (NEMO-MED12). In this numerical study, model results are compared with available in-situ observations to evaluate the model performance about the present-day distribution of stable water isotopes and their relationship with salinity on a sub-basin-scale. There is good agreement between the modelled and observed distributions of δ18 Osw in the surface water. The model successfully simulates the observed east-west gradient of δ18 Osw characterising surface, intermediate and deep waters. The results also show good agreement between the simulated δD and the in-situ data. The δD shows a strong linear relationship with δ18 Osw (r2 = 0.98) and salinity (r2 = 0.94) for the whole Mediterranean Sea. Moreover, the modelled relationships between δ18 Osw and salinity agree well with observations, with a weaker slope in the eastern basin than in the western basin. We investigate the relationship of the isotopic signature of the CaCO3 shell (δ18Oc) with temperature and the influence of seasonality. Our results suggest a more quantitative use of δ18O records, combining reconstruction with modelling approaches. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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