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Journal Article

Surface flux drivers for the slowdown of the Atlantic Meridional Overturning Circulation in a high resolution global coupled climate model

MPS-Authors
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Putrasahan,  Dian       
Ocean Statistics, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Lohmann,  Katja
Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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von Storch,  Jin-Song       
Ocean Statistics, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Jungclaus,  Johann H.       
Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Gutjahr,  Oliver
Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Haak,  Helmut
Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Citation

Putrasahan, D., Lohmann, K., von Storch, J.-S., Jungclaus, J. H., Gutjahr, O., & Haak, H. (2019). Surface flux drivers for the slowdown of the Atlantic Meridional Overturning Circulation in a high resolution global coupled climate model. Journal of Advances in Modeling Earth Systems, 11, 1349-1363. doi:10.1029/2018MS001447.


Cite as: https://hdl.handle.net/21.11116/0000-0003-5ADB-2
Abstract
This paper investigates the causation for the decline of the Atlantic Meridional Overturning Circulation (AMOC) from approximately 17 Sv to about 9 Sv, when the atmospheric resolution of the Max Planck Institute-Earth System Model is enhanced from ∼1° to ∼0.5°. The results show that the slowdown of the AMOC is caused by the cessation of deep convection. In most modeling studies, this is thought to be controlled by buoyancy fluxes in the convective regions, for example, by surface freshwater flux that is introduced locally or via enormous input from glacier or iceberg melts. While we find that freshwater is still the key to the reduction of AMOC seen in the higher-resolution run, the freshening of the North Atlantic does not need to be directly caused by local freshwater fluxes. Instead, it can be caused indirectly through winds via a reduced wind-driven gyre circulation and salinity transport associated to this circulation, as seen in the higher-resolution run. © 2019. The Authors.