Preprints
https://doi.org/10.5194/gmd-2023-149
https://doi.org/10.5194/gmd-2023-149
Submitted as: model description paper
 | 
17 Jul 2023
Submitted as: model description paper |  | 17 Jul 2023
Status: this preprint is currently under review for the journal GMD.

Modelling oxygen (18O, 17O, 16O) and hydrogen (2H, 1H) water isotopes in the coupled numerical climate model iLOVECLIM (version 1.1.5)

Thomas Extier, Thibaut Caley, and Didier M. Roche

Abstract. Stable water isotopes are used to infer changes in the hydrological cycle for different climate periods in climatic archive and numerical climate models. Following previous developments of δ18O in the intermediate complexity model iLOVECLIM, we present here the implementation of the δ2H and δ17O water isotopes in the different components of this coupled numerical climate model, and calculate the d-excess and 17O-excess. Results of a 5,000 years equilibrium simulation under preindustrial conditions are analysed and compared to observations for the atmosphere and the ocean components.

In the atmospheric component, the model correctly reproduces the first order global distribution of the δ2H and d-excess as observed in the data, even if local differences are observed. The latitudinal gradient is also correctly reproduced in our model and fits previous water isotopes enabled General Circulation Models simulations despite a simplified atmospheric component in iLOVECLIM. One exception is observed in Antarctica where the model does not correctly estimate the water isotope composition, consequence of the non-conservative behaviour of the advection scheme at very low moisture content. For the ocean, the model also simulates adequate isotopic composition in comparison to the observations, except for local areas such as in the surface Arabian Sea, a part of the Arctic and West equatorial Indian ocean. Data-model evaluation also presents a good match for the δ2H over the entire water column in the Atlantic Ocean, reflecting the influence of the different water masses. Modelled δ17O and 17O-excess are also evaluated against measurements for the two components of the model and compare to another General Circulation Model.

Thomas Extier et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2023-149', Anonymous Referee #1, 23 Jul 2023
  • RC2: 'Comment on gmd-2023-149', Anonymous Referee #2, 05 Aug 2023
  • CEC1: 'Comment on gmd-2023-149', Juan Antonio Añel, 06 Sep 2023

Thomas Extier et al.

Thomas Extier et al.

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Short summary
Stable water isotopes are used to infer changes in the hydrological cycle for different time periods in climatic archive and climate models. We present here the implementation of the δ2H and δ17O water isotopes in the coupled climate model iLOVECLIM, and calculate the d-excess and 17O-excess. Results of a simulation under preindustrial conditions show that the model correctly reproduces the water isotopes distribution in the atmosphere and in the ocean, in comparison to data and other GCMs.