A global scientific effort is underway to understand whether the Atlantic Meridional Overturning Circulation, a vast system of ocean currents that influences global climate, is beginning to weaken or change. Robotic probes known as Argo floats, along with satellites, moored sensors and research vessels, are collecting data from the Atlantic to help answer one of the most important questions in climate science.
The AMOC plays a crucial role in transporting heat across the Atlantic, carrying roughly 50 times the total energy humanity uses northward each year. For the United Kingdom and north-west Europe, this system is particularly significant because it contributes to the relatively mild climate these regions experience compared to their latitude. The tropical regions receive far more solar energy than the poles, creating an imbalance that drives winds, storms and ocean currents in an effort to redistribute that heat. Changes to the AMOC could alter this redistribution system with far-reaching consequences.
Scientists remain divided on the precise nature and speed of potential changes. Most agree the circulation is likely to weaken as the planet continues to warm, but disagreement exists regarding the magnitude and timeline. Some researchers point to warning signs already visible, including an unusual cooling patch in the North Atlantic and changes in water salinity. Other experts urge caution, suggesting evidence may indicate a slower decline or reorganisation rather than a sudden shutdown. In extreme scenarios, some warn the circulation could “collapse” entirely.
If the AMOC weakens significantly, the consequences could be substantial. Storm tracks might shift, rainfall patterns could alter, and winters could become more volatile and potentially colder in the UK and north-west Europe, even as global average temperatures continue rising. Such changes would not be confined to Europe; they could affect the West African monsoon, tropical rainfall patterns and precipitation over the Amazon, with implications for harvests, water supplies and livelihoods across multiple continents.
Historical evidence provides insight into how rapidly such changes can occur. A recent study examining the Younger Dryas period, which occurred nearly 13,000 years ago, reveals that a major shift in Atlantic circulation may have taken hold over just a few decades, triggering over a thousand years of colder conditions across Britain and northern Europe. This historical perspective underscores the potential for abrupt change in the modern ocean system.
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