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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-196
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-196
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model description paper 30 Aug 2019

Submitted as: model description paper | 30 Aug 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

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

Tristan Vadsaria1, Laurent Li2, Gilles Ramstein1, and Jean-Claude Dutay1 Tristan Vadsaria et al.
  • 1Laboratoire des Sciences du Climats et de l’Environnement, CEA-CNRS-Université Paris Saclay, Gif-sur-Yvette, 91191, France
  • 2Laboratoire de Météorologie Dynamique, CNRS-ENS-Ecole Polytechnique-Sorbonne Université, Paris, 75005, France

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 MTC (Mediterranean Thermohaline Circulation). 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 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 (LIG), the last glacial maximum (LGM) and the Late Pliocene, all present interesting scientific challenges which may be addressed using this numerical platform.

Tristan Vadsaria et al.
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Short summary
This article aims to reproduce the Early Holocene climate over the Mediterranean basin, characterized with a large reorganization of the Mediterranean Thermohaline Circulation. In order to reduce the demand of strong computation resources, a comprehensive global to regional model architecture is developed and validated against paleo data. Beyond the case study shown here, this platform may be applied to a large number of paleoclimate contexts.
This article aims to reproduce the Early Holocene climate over the Mediterranean basin,...
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