Catastrophic Collapse of Atlantic Meridional Overturning Circulation Predicted

A catastrophic collapse of the Atlantic Meridional Overturning Circulation (AMOC) would have far-reaching consequences for the world's climate, bringing harsh "ice age" winters to Europe and disrupting vital monsoons in Africa and Asia.

The AMOC is a crucial ocean current that sustains Europe's temperate climate by transporting heat from the equator towards the poles. A significant weakening of this circulation could lead to sea level rises in North America and severe changes to regional climates worldwide.

Researchers have found that there may be hope for recovery if global temperatures were to drop, but it is still unclear what would trigger such a cooling trend. The study's findings suggest a linear relationship between global mean temperature and the AMOC's response to climate change.

Climate model simulations by Chuncheng Guo at the Danish Meteorological Institute have shown that while the AMOC could weaken significantly under rising temperatures, it may be possible for it to recover its strength just as quickly if global cooling occurs.

The simulation of AMOC collapse has taken into account the melting of the Greenland ice sheet and rising air temperatures, both critical factors in the weakening of the ocean circulation system.

Results show that even at a rate of warming slightly slower than current levels - 2°C per decade - the AMOC would weaken significantly over centuries, but not completely shut down.

The simulation suggests that even with up to 10°C of warming, the AMOC wouldn't be totally extinguished. This indicates some resilience in the system.

If global emissions were rapidly reduced to net zero and then carbon was actively removed from the atmosphere and stored long-term, the AMOC would begin to recover within decades.

Restarting the Atlantic Meridional Overturning Circulation (AMOC) after it has collapsed would come at a steep cost for Europe's climate. The region would experience accelerated warming after an initial period of dramatic cooling, exacerbating its already precarious situation.

The findings are based on a single climate model and may be overestimating the stability of the AMOC. This limitation is being addressed by researchers in Germany who are rerunning the experiment using 10 different climate models to gauge the variability of results.

The study's conclusions align with previous research, including a July 2026 publication that found reducing CO2 levels could reverse an AMOC slowdown. The international project aims to better understand tipping-point risks and their potential consequences for global climate systems.