AMOC Collapse Could Plunge Northern Europe Into a New Ice Age Sooner Than Expected
AMOC Collapse Could Plunge Northern Europe Into a New Ice Age Sooner Than Expected
AMOC Collapse Could Plunge Northern Europe Into a New Ice Age Sooner Than Expected
The Atlantic Meridional Overturning Circulation (AMOC) plays a vital role in keeping Northern Europe's climate mild. But new research warns that this system could collapse sooner than expected. Scientists now compare a potential shutdown to the harsh conditions of the Younger Dryas period over 12,000 years ago.
The AMOC works by carrying warm water from the equator northwards. As it cools and becomes saltier, the water sinks, driving the current. However, climate change and melting glaciers add freshwater, making the water lighter and slowing the flow.
Around 12,000 years ago, a sudden AMOC slowdown caused extreme winters in Northern Europe. Yet summers stayed relatively warm due to stronger sunlight. This period, known as the Younger Dryas, saw boreal forests shrink and tundra-like landscapes expand in places like Estonia.
Recent studies, including CMIP6 model simulations and paleoclimate research published in Nature Climate Change, suggest a similar shift could happen again. If the AMOC collapses, Northern Europe might face 5–10°C cooling, turning forests into grassy, shrub-dominated terrain. Findings by Brierley et al. and Jungclaus et al. support this scenario, with further details in Quaternary Science Reviews.
The IPCC currently estimates an AMOC collapse is unlikely before 2100. But some research warns it could occur within 35 years, much sooner than previously thought.
A weakened AMOC would bring back conditions last seen in the Younger Dryas: bitter winters but stable summers. Northern Europe's climate could change drastically, with forests replaced by tundra-like vegetation. The latest studies highlight the urgency of monitoring this critical ocean current.