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• W3012514458 startingPage "4697" @default.
• W3012514458 abstract "Abstract Variations in the Atlantic meridional overturning circulation (AMOC) driven by buoyancy forcing are typically characterized as having a low-frequency time scale, interhemispheric structure, cross-equatorial heat transport, and linkages to the strength of Northern Hemisphere gyre circulations and the Gulf Stream. This study first tests whether these attributes ascribed to the AMOC are reproduced in a coupled model that is mechanically decoupled and, hence, is only buoyancy coupled. Overall, the mechanically decoupled model reproduces these attributes, with the exception that in the subpolar gyre, buoyancy drives AMOC variations on interannual to multidecadal time scales, yet only the multidecadal variations penetrate into the subtropics. A stronger AMOC is associated with a strengthening of the Northern Hemisphere gyre circulations, Gulf Stream, and northward oceanic heat transport throughout the basin. We then determine whether the characteristics in the mechanically decoupled model can be recovered by low-pass filtering the AMOC in a fully coupled version of the same model, a common approach used to isolate the buoyancy-driven AMOC. A major conclusion is that low-pass filtering the AMOC in the fully coupled model reproduces the buoyancy-driven AMOC pattern and most of the associated attributes, but not the statistics of the temporal variability. The strength of the AMOC–Gulf Stream connection is also not reproduced. The analyses reveal caveats that must be considered when choosing indexes and filtering techniques to estimate the buoyancy-driven AMOC. Results also provide insight on the latitudinal dependence of time scales and drivers of ocean circulation variability in coupled models, with potential implications for measurement and detection of the buoyancy-driven AMOC in the real world." @default.
• W3012514458 created "2020-03-23" @default.
• W3012514458 creator A5012335902 @default.
• W3012514458 creator A5025964517 @default.
• W3012514458 creator A5080267094 @default.
• W3012514458 date "2020-06-01" @default.
• W3012514458 modified "2023-09-24" @default.
• W3012514458 title "Extracting the Buoyancy-Driven Atlantic Meridional Overturning Circulation" @default.
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• W3012514458 doi "https://doi.org/10.1175/jcli-d-19-0590.1" @default.
• W3012514458 hasPublicationYear "2020" @default.
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