A new scientific study has provided strong evidence that the unusual cold region in the North Atlantic, located south of Greenland and often called the 'cold blob' or 'North Atlantic warming hole,' is closely linked to the weakening of the Atlantic Meridional Overturning Circulation (AMOC).

Researchers analyzed satellite observations, ocean heat content measurements, and historical climate records dating back to 1955 to determine why this area is cooling while most of the planet continues to warm.Their findings indicate that the cooling is not caused by increased heat loss from the ocean surface.Instead, the region is receiving less heat because the AMOC is transporting less warm water northward from tropical regions.The AMOC is a major ocean circulation system that helps regulate global climate by moving heat through the Atlantic Ocean.

Scientists have previously reported evidence of its slowdown, but this study strengthens the connection between the cold blob and the weakening circulation.The findings are consistent with earlier climate-model research published in 2025.Researchers warn that the AMOC may be approaching a critical tipping point beyond which it could experience a major decline or shutdown.

Such an event could have significant consequences, including colder winters in Europe, disruptions to global weather patterns, impacts on ecosystems, and threats to food security.

Although uncertainty remains regarding the exact timing, some climate model simulations suggest that this threshold could be crossed around the middle of the 21st century.The study's authors emphasize that the potential risks warrant serious attention from policymakers and continued scientific monitoring.