Influence of the atlantic meridional overturning circulation on future climate change impacts ...

• Main Authors: Bellomo, Katinka, Meccia, Virna, Fabiano, Federico, D'Agostino, Roberta, Corti, Susanna, von Hardenberg, Jost
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: North Atlantic
• Online Access: https://dx.doi.org/10.57757/iugg23-0905; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016572

<!--!introduction!--> In climate model simulations of future climate change, the Atlantic Meridional Overturning Circulation (AMOC) is projected to decline. However, the impacts of this decline, relative to other changes, remain to be identified. Here we address this problem by analyzing 30 idealized abrupt-4xCO2 climate model simulations. We find that in models with larger AMOC decline, there is a minimum warming in the North Atlantic, a southward displacement of the Inter-tropical Convergence Zone, and a poleward shift of the mid-latitude jet. The changes in the models with smaller AMOC decline are drastically different: there is a relatively larger warming in the North Atlantic, the precipitation response exhibits a wet-get-wetter, dry-get- drier pattern, and there are smaller displacements of the mid-latitude jet. We further investigate the impacts of a weakened AMOC in ad-hoc model experiments using EC-Earth3, a state-of-the-art climate model participating in CMIP6. We compare two model ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...