The Atlantic Meridional Overturning Circulation (AMOC) is often described as a conveyor belt that carries warm surface water north and cold deep water south. A critical component is the formation of North Atlantic Deep Water, which helps pull water down and drive the system. But a new study suggests that even if this component fails, the larger cross-hemispheric overturning circulation might not stop entirely.
The research, highlighted by AGU Eos, used model simulations to test what happens when North Atlantic Deep Water formation shuts down. The results indicate that the overturning circulation could persist for centuries, sustained by other processes in the ocean. This challenges the assumption that a collapse of this key AMOC component would quickly bring the entire circulation to a halt.
The findings have implications for climate projections, as the AMOC is closely tied to regional and global climate patterns. If the overturning can continue in a weakened state, the long-term effects of a shutdown may be different from what earlier models suggested. The study does not downplay the risks of AMOC slowdown, but it points to a more resilient ocean system than previously thought.