Caribbean faces greater risk as Atlantic current shows weakness

The Atlantic Meridional Overturning Circulation (AMOC) is projected to weaken substantially this century, with new research narrowing the range of uncertainty — though scientists remain divided on whether a full collapse before 2100 is likely, and the consequences for the Caribbean, Americas, and Europe would be severe either way. But it is the Caribbean that could be most exposed and have the most to lose.

The Atlantic Meridional Overturning Circulation (AMOC) — the vast ocean conveyor belt that helps regulate Caribbean hurricane seasons, rainfall, and sea levels — is weakening, and new research is sharpening just how serious that threat has become.

A study published in Science Advances combined real-world ocean observations with climate models to filter out the least reliable projections, finding that models showing the steepest AMOC slowdown align best with actual data. The result: an estimated slowdown of 42% to 58% by 2100. Lead researcher Dr Valentin Portmann described the finding as indicating the AMOC will "decline more than expected."

A separate study in Nature, led by UK Met Office and University of Exeter scientists assessing 34 climate models, found that a full AMOC collapse before 2100 is "very unlikely" — but confirmed the current is "projected to weaken owing to global warming, with significant global climate impacts." The study's authors explicitly warned the finding was "no green light for complacency."

Meanwhile, Woods Hole Oceanographic Institution researchers published findings in Nature Communications (January 2025) indicating the AMOC has shown no measurable decline over the past 60 years — though lead scientist Nicholas Foukal cautioned: "That doesn't say anything about its future."

A further study published in Nature (July 2024) found that even a modest AMOC slowdown could reduce rainfall over parts of the Amazon by nearly 40%, with cascading effects on Caribbean wet and dry seasons.

• Science Advances: models showing steepest AMOC slowdown most aligned with observational data • Projected slowdown of 42–58% by 2100 identified as most realistic range • Nature (UK Met Office/Exeter): full collapse before 2100 'very unlikely' but significant weakening 'very likely' • Nature Communications (WHOI, Jan 2025): no measurable AMOC decline over past 60 years • Nature (July 2024): slight AMOC slowdown could cut Amazon rainfall by nearly 40% • November 2025: Iceland became the first country to formally declare AMOC weakening a national security threat

For the Caribbean, a weakening AMOC is not a distant abstraction — it is a structural threat to the conditions that shape hurricane seasons, rainfall, food security, and coastal resilience. 

Warmer tropical Atlantic waters resulting from a slowed circulation provide more fuel for hurricanes, and scientists note that storm tracks could shift westward, reducing the historical 'fewer direct hits' buffer that some eastern Caribbean islands have relied upon. 

Erratic rainfall would stress agriculture, freshwater systems, and the watersheds that small island communities depend on.

Beyond storms, coral reef systems and mangrove ecosystems — which provide critical coastal protection across the region — face compounding stress from warmer seas and larger storm surges. The projected 40% rainfall reduction over parts of the Amazon, if realised, would also affect the regional climate system that influences Caribbean dry and wet seasons.

"A Nature study assessing 34 climate models found AMOC collapse before 2100 is 'very unlikely' — but the same research confirmed the current is 'very likely to weaken this century,' bringing major climate impacts including threats to food security, fish stocks, and rainfall patterns across the tropics."

— Nature / UK Met Office and University of Exeter

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Viewpoint: Stefan Rahmstorf, who has studied the AMOC for over three decades, argues that climate models predicting the steepest slowdown now align most closely with real-world ocean observations — making a 42–58% weakening by 2100 the most credible projection. For the Caribbean, that range is not a technical footnote: it describes a future of intensified hurricane fuel, disrupted rainfall, and accelerating sea level rise across low-lying coastlines from Guyana to The Bahamas. Rahmstorf has warned the tipping point where shutdown becomes inevitable could arrive as early as mid-century.

Viewpoint: Scientists at the UK Met Office and University of Exeter assessed 34 climate models and concluded a full AMOC collapse before 2100 is 'very unlikely,' thanks partly to stabilising winds from the Southern Ocean. But lead researcher Dr Joy Mercer Baker was explicit: this is 'no green light for complacency.' Significant weakening remains virtually certain, threatening Caribbean food security, fish stocks, and the rainfall patterns that small island agricultural systems depend on.

Viewpoint: Woods Hole Oceanographic Institution researchers found no measurable AMOC decline over the past 60 years, suggesting the system may be more resilient than earlier studies indicated. For Caribbean planners, the finding offers limited comfort — researchers stress it says nothing about future trajectory, and that the window to reduce emissions and build coastal resilience remains open, but not indefinitely.

Hurricane Melissa was not a freak event; it was a warning. When it tore through Jamaica last year as a Category 5, scientists weren't surprised—they were alarmed. But while governments in Iceland have already declared the weakening of the Atlantic Meridional Overturning Circulation (AMOC) a national security threat, the Caribbean remains dangerously quiet.

The AMOC—the vast system regulating Atlantic temperature and storm patterns—is projected to slow by up to 58% by 2100. For a region that lost billions to Melissa in a single week, this is no abstract threat. It is the mandatory context for every infrastructure decision, tourism investment, and agricultural policy moving forward.

Iceland is wealthy and institutionally strong, yet they are treating this as an emergency. The Caribbean has neither their resources nor their geographic buffer. The least our leaders can do is match their seriousness.

Coastal resilience and assertive climate positioning are no longer "optional extras." They are the price of survival in the Atlantic that is coming—not the Atlantic that was. The current is weakening. The window is closing.

Last year Jamaica was hit by a Category 5 hurricane - Melissa - the first time anywhere in the Western Hemisphere had ever been hit by such a powerful storm. Is it a sign of what the Caribbean can now expect, as climate experts predict a worsening natural environment?

Iceland has declared AMOC weakening a national security threat. The Caribbean — more exposed, more vulnerable, and with far less institutional capacity to absorb the consequences — has not. That gap should trouble every government from Port of Spain to Nassau.

The science is not unanimous on timing, but it is unanimous on direction: the AMOC is weakening, and the Caribbean sits directly in the path of what follows. Warmer Atlantic waters mean more hurricane fuel. Shifting storm tracks mean fewer geographic buffers for eastern Caribbean islands. Disrupted rainfall means stressed agriculture and freshwater systems already running thin.

A 42–58% slowdown by 2100 is not a distant scenario — it is the current scientific consensus. Caribbean leaders cannot afford to treat it as someone else's emergency. Coastal resilience investment, ecosystem protection, and assertive positioning in global climate negotiations are not optional. The current is weakening. The window is not permanently open.