AMOC collapse could be irreversible, new study finds

The Atlantic Meridional Overturning Circulation (AMOC), a system of ocean currents that transports warm water from the tropics to the North Atlantic, is a key regulator of Europe’s climate. Recent scientific assessments indicate that the stability of the AMOC is increasingly tied to two factors: the volume of carbon dioxide released into the atmosphere and the rate at which Greenland’s ice sheet is melting. Elevated greenhouse‑gas concentrations intensify surface warming, reducing the density of seawater that drives the deep‑water formation essential to the circulation, while accelerated meltwater influx from Greenland adds fresh water that further weakens this process.

Model simulations and proxy data analyses published this year suggest that the AMOC may already be approaching a critical threshold, raising the possibility of a near‑term slowdown or shutdown. Researchers caution that continued high emissions could lock in a permanent reduction of the current, potentially leading to colder winters in northern Europe and broader disruptions to global weather patterns. The findings underscore the urgency of limiting carbon output and monitoring ice‑sheet dynamics to mitigate the projected climate impacts.