Natural variability has dominated Atlantic Meridional Overturning Circulation since 1900

Mojib Latif (), Jing Sun (), Martin Visbeck and M. Hadi Bordbar
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Mojib Latif: GEOMAR Helmholtz Centre for Ocean Research Kiel
Jing Sun: GEOMAR Helmholtz Centre for Ocean Research Kiel
Martin Visbeck: GEOMAR Helmholtz Centre for Ocean Research Kiel
M. Hadi Bordbar: Leibniz-Institut für Ostseeforschung Warnemünde – IOW

Nature Climate Change, 2022, vol. 12, issue 5, 455-460

Abstract: Abstract There is debate about slowing of the Atlantic Meridional Overturning Circulation (AMOC), a key component of the global climate system. Some focus is on the sea surface temperature (SST) slightly cooling in parts of the subpolar North Atlantic despite widespread ocean warming. Atlantic SST is influenced by the AMOC, especially on decadal timescales and beyond. The local cooling could thus reflect AMOC slowing and diminishing heat transport, consistent with climate model responses to rising atmospheric greenhouse gas concentrations. Here we show from Atlantic SST the prevalence of natural AMOC variability since 1900. This is consistent with historical climate model simulations for 1900–2014 predicting on average AMOC slowing of about 1 Sv at 30° N after 1980, which is within the range of internal multidecadal variability derived from the models’ preindustrial control runs. These results highlight the importance of systematic and sustained in-situ monitoring systems that can detect and attribute with high confidence an anthropogenic AMOC signal.

Date: 2022
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DOI: 10.1038/s41558-022-01342-4

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