A large “cold blob” in the North Atlantic—just south of Greenland—has cooled nearly 2 degrees Fahrenheit since 1900, and researchers say it may be tied to the weakening of the AMOC circulation system. Scientists warn that if the Atlantic current system were to
For decades, the Atlantic has been getting warmer in the ways that show up on charts and in headlines. But just south of Greenland, a different kind of pattern has been carving out its own footprint.
Scientists are pointing to a large, unusually cooled patch in the North Atlantic Ocean—one researchers have nicknamed the “cold blob.” The area has cooled nearly 2 degrees Fahrenheit since 1900, even as much of the rest of the ocean continues to endure record hot temperatures.
At the center of the concern is a system that helps move heat around the planet: the Atlantic Meridional Overturning Circulation. or AMOC. The process transports warm water northward, where it cools and sinks, then flows back south. It’s a conveyor belt of sorts—slow. massive. and crucial to the climate rhythms that many people across the world have come to rely on.
The presence of the “cold blob,” researchers say, suggests the AMOC is weakening. The explanation they’ve landed on ties the shift back to human-caused warming: as warming melts ice caps. cold. fresh water can be added to the ocean. disrupting a delicate balance that AMOC depends on to keep moving as it has.
The stakes, scientists warn, are not theoretical. If the AMOC were to stop completely, it would likely bring rising sea levels to the U.S. East Coast. It could also mean frigid winters in Europe and prolonged droughts in Africa.
The picture emerging from the “cold blob” is stark because it cuts across what the rest of the world’s ocean data already seems to be telling. One part of the Atlantic is cooling while the broader system runs hot. If AMOC continues to weaken. researchers say. those two realities may be connected—not through comfort or chance. but through a circulation change that could ripple outward into weather and coastline impacts far beyond the North Atlantic itself.
AMOC Atlantic Meridional Overturning Circulation cold blob North Atlantic Greenland sea level rise U.S. East Coast Europe winter droughts in Africa ocean currents climate change