Development of a sequential tool, LMDZ-NEMO-med-V1, to conduct global-to-regional past climate simulation for the Mediterranean basin: an Early Holocene case study
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Published:2020-05-19
Issue:5
Volume:13
Page:2337-2354
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ISSN:1991-9603
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Container-title:Geoscientific Model Development
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language:en
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Short-container-title:Geosci. Model Dev.
Author:
Vadsaria TristanORCID, Li LaurentORCID, Ramstein Gilles, Dutay Jean-ClaudeORCID
Abstract
Abstract. Recently, major progress has been made in the simulation of the ocean
dynamics of the Mediterranean using atmospheric and oceanic models with
high spatial resolution. High resolution is essential to accurately capture the
synoptic variability required to initiate intermediate- and deep-water
formation, the engine of the Mediterranean thermohaline circulation (MTC).
In paleoclimate studies, one major problem with the simulation of regional
climate changes is that boundary conditions are not available from
observations or data reconstruction to drive high-resolution regional
models. One consistent way to advance paleoclimate modelling is to use a
comprehensive global-to-regional approach. However, this approach needs
long-term integration to reach equilibrium (hundreds of years), implying
enormous computational resources. To tackle this issue, a sequential
architecture of a global–regional modelling platform has been developed for
the first time and is described in detail in this paper. First of all, the
platform is validated for the historical period. It is then used to
investigate the climate and in particular, the oceanic circulation, during
the Early Holocene. This period was characterised by a large reorganisation
of the MTC that strongly affected oxygen supply to the intermediate and deep
waters, which ultimately led to an anoxic crisis (called sapropel). Beyond
the case study shown here, this platform may be applied to a large number of
paleoclimate contexts from the Quaternary to the Pliocene, as long as
regional tectonics remain mostly unchanged. For example, the climate
responses of the Mediterranean basin during the last interglacial period (LIG), the
Last Glacial Maximum (LGM) and the Late Pliocene all present interesting
scientific challenges which may be addressed using this numerical platform.
Publisher
Copernicus GmbH
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