Atlantic Meridional Overturning Circulation acts as planetary heat vent

New research suggests the Atlantic Meridional Overturning Circulation (AMOC) functions as an oceanic ‘heat vent’ that regulates planetary temperature by determining how much heat the ocean releases into the atmosphere.

When circulation is strong, deep water mixing in the North Atlantic allows the ocean to release large amounts of heat to the atmosphere and space. However, climate change is weakening this circulation. As the AMOC slows, this mixing process weakens, causing more heat to remain trapped within the ocean's interior.

NASA-related analyses and satellite data have identified a persistent cold patch in the North Atlantic, south of Greenland and Iceland, often referred to as a ‘warming hole.’ While most of the world's oceans are warming, this specific region remains cooler than the global trend. Scientists, including Stefan Rahmstorf from the University of Potsdam, suggest this anomaly is driven by reduced heat transport from the tropics. Some evidence indicates the AMOC may currently be at its weakest state in approximately 1,000 years.