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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Volume 6, issue 5 | Copyright

Special issue: The iLOVECLIM earth system model

Geosci. Model Dev., 6, 1481-1491, 2013
https://doi.org/10.5194/gmd-6-1481-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Model description paper 12 Sep 2013

Model description paper | 12 Sep 2013

δ18O water isotope in the iLOVECLIM model (version 1.0) – Part 1: Implementation and verification

D. M. Roche D. M. Roche
  • 1Earth and Climate Cluster, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
  • 2Laboratoire des Sciences du Climat et de l'Environnement (LSCE), UMR8212, CEA/CNRS-INSU/UVSQ, Gif-sur-Yvette Cedex, France

Abstract. A new 18O stable water isotope scheme is developed for three components of the iLOVECLIM coupled climate model: atmospheric, oceanic and land surface. The equations required to reproduce the fractionation of stable water isotopes in the simplified atmospheric model ECBilt are developed consistently with the moisture scheme. Simplifications in the processes are made to account for the simplified vertical structure including only one moist layer. Implementation of these equations together with a passive tracer scheme for the ocean and a equilibrium fractionation scheme for the land surface leads to the closure of the (isotopic-) water budget in our climate system. Following the implementation, verification of the existence of usual δ18O to climatic relationships are performed for the Rayleigh distillation, the Dansgaard relationship and the δ18O –salinity relationship. Advantages and caveats of the approach taken are outlined. The isotopic fields simulated are shown to reproduce most expected oxygen-18–climate relationships with the notable exception of the isotopic composition in Antarctica.

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