Coherence of the AMOC Over the Subpolar North Atlantic on Interannual to Multiannual Time Scales
Abstract Direct measurements of the Atlantic Meridional Overturning Circulation (AMOC) are necessary to understand its evolution in a context of climate change. International programs monitored its recent evolution at different latitudes. However, the AMOC coherence over the North Atlantic remains u...
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| Format: | Article |
| Language: | English |
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Wiley
2025-05-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2025GL115171 |
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| author | T. Petit J. Robson D. Ferreira S. Yeager D. G. Evans |
| author_facet | T. Petit J. Robson D. Ferreira S. Yeager D. G. Evans |
| author_sort | T. Petit |
| collection | DOAJ |
| description | Abstract Direct measurements of the Atlantic Meridional Overturning Circulation (AMOC) are necessary to understand its evolution in a context of climate change. International programs monitored its recent evolution at different latitudes. However, the AMOC coherence over the North Atlantic remains unclear. Here, we explore the potential of the Overturning in the Subpolar North Atlantic Programme (OSNAP) array to inform us on mid‐latitude AMOC strength on interannual‐to‐multiannual timescales in two high‐resolution coupled models. We find that the AMOC strength measured at OSNAP is not related to the variability of the AMOC strength at mid‐latitudes. Instead, our study reveals that the density at which the maximum overturning occurs at OSNAP is a key precursor of the mid‐latitude AMOC strength. The causal relationship between AMOC density at the OSNAP array and AMOC strength at 45°N is linked to an atmospherically driven shoaling of isopycnal surfaces that propagates along the western boundary in a year. |
| format | Article |
| id | doaj-art-81971e101a614e79a3c35276d3eda4bb |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-81971e101a614e79a3c35276d3eda4bb2025-08-20T02:01:20ZengWileyGeophysical Research Letters0094-82761944-80072025-05-01529n/an/a10.1029/2025GL115171Coherence of the AMOC Over the Subpolar North Atlantic on Interannual to Multiannual Time ScalesT. Petit0J. Robson1D. Ferreira2S. Yeager3D. G. Evans4National Oceanography Centre Southampton UKNational Centre for Atmospheric Science Department of Meteorology University of Reading Reading UKDepartment of Meteorology University of Reading Reading UKNational Center for Atmospheric Research Boulder CO USANational Oceanography Centre Southampton UKAbstract Direct measurements of the Atlantic Meridional Overturning Circulation (AMOC) are necessary to understand its evolution in a context of climate change. International programs monitored its recent evolution at different latitudes. However, the AMOC coherence over the North Atlantic remains unclear. Here, we explore the potential of the Overturning in the Subpolar North Atlantic Programme (OSNAP) array to inform us on mid‐latitude AMOC strength on interannual‐to‐multiannual timescales in two high‐resolution coupled models. We find that the AMOC strength measured at OSNAP is not related to the variability of the AMOC strength at mid‐latitudes. Instead, our study reveals that the density at which the maximum overturning occurs at OSNAP is a key precursor of the mid‐latitude AMOC strength. The causal relationship between AMOC density at the OSNAP array and AMOC strength at 45°N is linked to an atmospherically driven shoaling of isopycnal surfaces that propagates along the western boundary in a year.https://doi.org/10.1029/2025GL115171Atlantic Meridional Overturning CirculationNorth Atlantic Oscillationhigh‐resolution coupled modelsboundary anomalies |
| spellingShingle | T. Petit J. Robson D. Ferreira S. Yeager D. G. Evans Coherence of the AMOC Over the Subpolar North Atlantic on Interannual to Multiannual Time Scales Geophysical Research Letters Atlantic Meridional Overturning Circulation North Atlantic Oscillation high‐resolution coupled models boundary anomalies |
| title | Coherence of the AMOC Over the Subpolar North Atlantic on Interannual to Multiannual Time Scales |
| title_full | Coherence of the AMOC Over the Subpolar North Atlantic on Interannual to Multiannual Time Scales |
| title_fullStr | Coherence of the AMOC Over the Subpolar North Atlantic on Interannual to Multiannual Time Scales |
| title_full_unstemmed | Coherence of the AMOC Over the Subpolar North Atlantic on Interannual to Multiannual Time Scales |
| title_short | Coherence of the AMOC Over the Subpolar North Atlantic on Interannual to Multiannual Time Scales |
| title_sort | coherence of the amoc over the subpolar north atlantic on interannual to multiannual time scales |
| topic | Atlantic Meridional Overturning Circulation North Atlantic Oscillation high‐resolution coupled models boundary anomalies |
| url | https://doi.org/10.1029/2025GL115171 |
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