Wu, Xiner; de Vernal, Anne et Myers, Paul G.
(2026).
« Mixed layer depth in the PMIP4 midHolocene simulations: comparison to proxy data in North Atlantic deep convection regions ».
Climate of the Past, 22, pp. 1609-1629.
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Résumé
The ocean mixed layer plays an essential role in
the climate system, regulating energy fluxes at the oceanatmosphere
interface. Its representation in climate models is
thus critical. Here, we evaluate the mixed layer depth (MLD)
in 15 models from the Paleoclimate Modelling Intercomparison
Project 4 (PMIP4) against dinocyst-based MLD reconstructions
from the subpolar North Atlantic for the mid-
Holocene (MH, 6 ka BP). We find a large spread in MLD responses
to MH forcings across the models in the present-day
deep-water formation areas, underscoring the importance of
model uncertainty. Most models fail to capture the direction
of MLD change, and the ensemble mean does not necessarily
outperform individual models. While the ensemble
mean aligns broadly with proxy data in the Nordic Seas, pronounced
proxy-model discrepancy in the Labrador Sea suggests
that meltwater forcing is a missing parameter, and that
deep-water formation in the Labrador Sea may be particularly
vulnerable under a future scenario of global warming
and ice-sheet melting.
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