Rapid warming may tip Atlantic circulation at 2°C, while slower warming may avert collapse
Researchers found the Atlantic circulation can stay stable at higher temperatures when warming is slow, but faster warming pushes it toward collapse.
- Researchers from Utrecht University found that the speed of global warming, rather than peak temperature alone, determines the stability of the Atlantic Meridional Overturning Circulation . The study was published in Nature Climate Change.
- Dynamical Oceanography professor Henk Dijkstra explains that the ocean needs time to reorganize and adapt to changing conditions. "Under slow warming, the entire ocean, from the surface down to its deepest layers, has time to gradually reorganize and adapt," he said.
- Co-Author Reyk Börner noted the critical warming rate is around 0.3°C per decade; while slow warming kept the AMOC stable past 5°C, faster warming caused collapse at approximately 2.5°C. "We deliberately looked at a scenario that is much slower than what we're experiencing today," Börner explained.
- Lead author René van Westen warns that current climate strategies, including the Paris Agreement, often overlook warming speed alongside temperature targets. "If you're driving toward a wall, it makes sense to steer around it," he said, adding "the world is still pressing extra hard on the accelerator right now."
- While the AMOC could reach a tipping point around 2060, these findings suggest there is no universal temperature threshold for collapse. Slowing the current pace of warming could reduce near-term risk by allowing the Atlantic more time to adjust to changing conditions.
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ecotopical.comThe Atlantic Ocean can handle more warming than expected — with one big catch
Scientists have found that the AMOC may be far more vulnerable to rapid warming than to temperature alone. When warming happens slowly, the ocean can adapt, but at faster rates similar to today’s, the massive Atlantic circulation could reach a tipping point at much lower temperatures.
The Gulf Stream Could Stall Even with Faster Warming: It Is Currently Moving Too Fast for the Ocean.
The Gulf Stream, which brings warm ocean water to Western Europe, may not have a fixed temperature limit at which it comes to a standstill. The rate at which the Earth is warming appears to be the determining factor. According to researcher René van Westen of Utrecht University, warming is currently occurring too rapidly for the ocean.
So far, researchers have assumed that the Atlantic current will collapse at a certain threshold, but now a study shows that the pace of global warming is also crucial.
If the Gulf Stream stalls, it will have drastic consequences for the global climate.
Rapid warming may tip Atlantic circulation at 2°C, while slower warming may avert collapse
For several years, climate scientists have shown that the Atlantic Meridional Overturning Circulation (AMOC) could come to a halt if the world warms too much. New research from Utrecht University shows that this picture is incomplete: The pace of warming also determines whether the AMOC stays stable.
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