δ18O water isotope in the iLOVECLIM model (version 1.0) – Part 2: Evaluation of model results against observed δ18O in water samples
Other literature type
Roche, D. M.
(issn: 1991-9603, eissn: 1991-9603)
The H<sub>2</sub><sup>18</sup>O stable isotope was previously introduced in the three coupled
components of the earth system model <i>i</i>LOVECLIM: atmosphere, ocean and
vegetation. The results of a long (5000 yr) pre-industrial equilibrium
simulation are presented and evaluated against measurement of H<sub>2</sub><sup>18</sup>O
abundance in present-day water for the atmospheric and oceanic components.
For the atmosphere, it is found that the model reproduces the observed
spatial distribution and relationships to climate variables with some merit,
though limitations following our approach are highlighted. Indeed, we obtain
the main gradients with a robust representation of the Rayleigh distillation
but caveats appear in Antarctica and around the Mediterranean region due to
model limitation. For the oceanic component, the agreement between the
modelled and observed distribution of water δ<sup>18</sup>O is found to be very
good. Mean ocean surface latitudinal gradients are faithfully reproduced as
well as the mark of the main intermediate and deep water masses. This opens
large prospects for the applications in palaeoclimatic context.