δ18O water isotope in the iLOVECLIM model (version 1.0) – Part 1: Implementation and verification
Other literature type
Roche, D. M.
(issn: 1991-9603, eissn: 1991-9603)
A new <sup>18</sup>O stable water isotope scheme is developed for three components of
the <i>i</i>LOVECLIM 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
δ<sup>18</sup>O to climatic relationships are performed for the
Rayleigh distillation, the Dansgaard relationship and the
δ<sup>18</sup>O –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.