That massive ocean current that keeps the world's climate steady can actually snap off like a broken light switch.
March 13, 2026
Original Paper
Regular and chaotic Welander oscillations in a four-dimensional conceptual model for the Atlantic Meridional Overturning Circulation
arXiv · 2603.11577
The Takeaway
Instead of a steady slowing down due to melting ice, new mathematical models of the Atlantic ocean show that the current system can enter a chaotic state. It could begin to lurch between active and inactive states unpredictably, suggesting that climate change might cause sudden 'flickering' shutdowns of heat transport rather than a gradual decline.
From the abstract
The Atlantic Meridional Overturning Circulation (AMOC) is a key component of the Earth's climate. Evidence indicates a twentieth-century weakening, and enhanced freshwater input to the subpolar North Atlantic may further reduce overturning strength. We present and study a conceptual four-dimensional, single-hemisphere box model with three compartments: a tropical surface box, a subpolar surface box, and a large deep-water box. Advective exchange couples the surface boxes and vertical exchange wi