The Atlantic meridional overturning circulation, or Amoc, is a vast system of ocean movement that transports heat from the tropics towards Greenland. There, surface waters cool, become denser, sink to great depth and return south. In effect, it redistributes heat and salinity across the Atlantic on a massive scale. Recent studies indicate a weakening trend, although the future path and speed of change remain uncertain because many processes affect the circulation. If the slowdown continues, northern Europe could experience much colder winters even as global temperatures rise. Tropical monsoons could shift, and sea levels could rise suddenly along the US east coast. The problem for journalism is not only scientific complexity, but visibility. Unlike forests, icebergs or hurricanes, Amoc leaves few dramatic images. Scientists can trace it through coral, sediment, instruments and computer models, yet these are mainly tools for analysis. As a result, simple diagrams and dramatic freeze imagery often stand in for a system that is far more complex than it looks.
The climate threat that remains largely invisible
The Atlantic meridional overturning circulation moves heat across the ocean, but it is difficult to visualise and therefore harder to keep in the public eye. Studies point to a weakening trend, and the possible effects include colder winters in northern Europe, shifting monsoons and faster sea level rise on the US east coast.
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