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Climate Impacts of the Atlantic Meridional Overturning Circulation

Description du projet

Examiner de plus près l’impact de l’AMOC pour l’Europe

Le changement climatique, l’enjeu le plus grave pour l’humanité, est influencé par nos océans. La circulation méridienne de retournement atlantique (AMOC), qui est la composante zonale intégrée des courants de surface et de profondeur dans l’océan Atlantique, exerce une influence considérable. Le projet CliMOC, financé par l’UE, étudiera le rôle et les conséquences de l’AMOC sur les changements climatiques et son impact pour l’Europe. Plus particulièrement, le projet proposera une hiérarchie de simulations de modèles climatiques afin de séparer le rôle de l’AMOC des autres processus. Il mettra également en œuvre un composant de modèle «slab ocean» (tranche d’océan) dans le modèle climatique mondial EC-Earth. Cela permettra au projet d’exécuter une simulation EC-Earth «slab ocean» grâce aux flux de chaleur de l’océan provenant d’une simulation EC-Earth totalement couplée.

Objectif

CliMOC is a proposal to fund a fellowship to be carried out by the Experienced Researcher (ER) Katinka Bellomo at host institution Polytechnic University of Turin, Italy (POLITO) in the department of Environment, Land and Infrastructure Engineering under the supervision of main host professor Jost von Hardenberg. The aim of the proposed work is to investigate the role of the Atlantic Meridional Overturning Circulation (AMOC) on climate impacts over Europe. Previous studies have shown an important role for the AMOC in modulating global climate change, in particular over the Northern Hemisphere and Europe. An AMOC collapse has been identified as a possible trigger of the initiation of Ice Ages. However, the influence of AMOC in future climate change is still unclear given the large inter-model uncertainty in the decline rate of AMOC, and the concurrent climate changes due to increasing concentrations of well-mixed greenhouse gases in the atmosphere. In this proposal, we advance some hypotheses for the role of AMOC in the current climate and future climate change, and we propose a hierarchy of climate model simulations to separate the role of AMOC from other processes. More specifically, we plan to implement a slab-ocean model component in the EC-Earth global climate model. Using the ocean heat fluxes from a fully-coupled EC-Earth simulation in which the AMOC is artificially weakened, we will be able to run a slab-ocean EC-Earth simulation with a high-resolution atmospheric component, which will let us investigate the role of AMOC in future climate change impacts over Europe. This work will help reduce the uncertainties in projections of future climate change by constraining the influence of AMOC.

Coordinateur

POLITECNICO DI TORINO
Contribution nette de l'UE
€ 183 473,28
Adresse
CORSO DUCA DEGLI ABRUZZI 24
10129 Torino
Italie

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Région
Nord-Ovest Piemonte Torino
Type d’activité
Higher or Secondary Education Establishments
Liens
Coût total
€ 183 473,28