Full Breakdown
New Studies Warn of Accelerating Weakening of the Atlantic Meridional Overturning Circulation
4/25/2026, 3:40:58 AM
Accelerating Weakening of the AMOC
Two peer-reviewed studies in *Science Advances* (April 2026) report that the AMOC is weakening faster than earlier estimates. University of Miami data show a 10 % decline over the past 20 years. A European analysis projects a >50 % reduction by 2100, raising the risk of a future collapse.
Historical Context and Prior Research
The AMOC moves warm, salty water northward, where it cools, sinks, and returns southward, moderating European climate and influencing rainfall in Africa and South Asia. Prior assessments in 2018 and 2021 warned of a possible collapse this century.
Observations and Model Projections
Four western-boundary sites show a 10 % weakening since 2000; models suggest a 43 %–59 % slowdown by 2100, with a 51 % reduction relative to the 1850-1900 baseline, and the study finds the decline 60 % stronger than model projections, implying a possible collapse in roughly 140 years if trends persist.
Climate Impacts of a Weakened AMOC
A weakened AMOC would likely cool the North Atlantic, increase European winter storms, cut Sahel and South Asian summer rainfall, raise sea level on the U.S. northeast coast, cause up to 60 °F temperature drops in Northern Europe, and could eliminate up to 50 % of wheat- and maize-suitable land.
Official Statements
Niklas Boers (Potsdam Institute) emphasizes AMOC’s role; Shane Elipot (University of Miami) flags western-boundary observations as warnings and warns of a tipping point; Jelle Soons (Utrecht University) says a Bering Strait dam could help avert collapse but stresses emission cuts remain essential.
Uncertainty and Divergent Views
Model uncertainty remains high. David Thornalley (UCL) warns that “there remains uncertainty in how well models can simulate and predict changes in AMOC.” María Paz Chidichimo (National University of San Martín) says magnitude and timing of decline remain debated, with projections of 43 %–59 % weakening and a 140-year tipping-point horizon.
Verbatim Quotes
- “The Atlantic Meridional Overturning Circulation really is one of our planet’s key circulation systems,” — Niklas Boers, Potsdam Institute for Climate Impact Research
- “In a sense, observations at the western boundary, in isolation from the eastern boundary, constitute the canary in a coal mine for the tendency of the AMOC,” — Shane Elipot, University of Miami
- “While cutting carbon emissions is still the best way to prevent an AMOC collapse, his findings show that “in a worst-case scenario,” a Bering Strait dam could be an option, Mr.” — Jelle Soons, Utrecht University
- “remains uncertainty in how well models can simulate and predict changes in the AMOC,” — David Thornalley, University College London
Next Steps
The University of Miami and international partners will continue monitoring of temperature, salinity and currents. Parallel research will evaluate the technical and environmental feasibility of a Bering Strait dam. Policymakers are urged to prioritize rapid CO2 emission cuts to limit further AMOC weakening.
