An inexplicable phenomenon is occurring in the North Atlantic, specifically in the region located between the east of Newfoundland and the south of Greenland and Iceland. Contrary to the general warming trend of the oceans, this area presents unexpectedly low temperatures. This behavior has captured the attention of scientists, who have warned about its persistent existence.
The Impact of Ocean Currents on Europe’s Future
The recent study indicates that this “cold patch” is not due to greater heat dissipation into the atmosphere, but rather to a reduced transport of heat by the ocean currents. Although it does not mean that Europe will face an immediate freeze, it does suggest that a significant change is underway that could alter the climate of the Atlantic.
Nicknamed “cold blob”, this anomaly is akin to finding a cold room in an otherwise heated house. Since the 19th century, this region of the Atlantic has cooled while the rest of the planet warms, a phenomenon that scientists attribute to heat accumulated in the depths of the ocean, not just on its surface.
The Atlantic Meridional Overturning Circulation (AMOC) acts as a gigantic conveyor belt of warm water from the tropics to the north, distributing heat and softening the temperatures of Western Europe. However, global warming could weaken this circulation due to the increase of freshwater in the North Atlantic.
Research published in Geophysical Research Letters analyzes how this heat transport is changing. It has been observed that the loss of surface heat has not increased, reinforcing the hypothesis that the ocean carries less heat to this area. This potential reduction in the AMOC could have serious repercussions on the climate in the long term.
Despite alarmist headlines, a “cold patch” alone does not evidence an imminent collapse of the AMOC nor does it predict an ice age for Northern Europe. However, some experts, including the IPCC, believe that it is likely the AMOC will weaken during this century, although not necessarily collapse abruptly before 2100.
Concerns about national security have arisen, particularly in Iceland, where the potential collapse of the AMOC is seen as a significant risk. Consequences such as colder winters, challenges in heating, and changes in agriculture and fishing are already being considered by the Nordic Council in a 2026 report.
The challenge lies in the long-term understanding of the AMOC, a process that requires continuous observations. With the withdrawal of monitoring infrastructures, obtaining critical data is compromised, just when it is most needed. It is essential to advance in reducing emissions and improving ocean observations to adequately prepare for future scenarios.
The full study is available in Geophysical Research Letters.
