Greenland Meltwater Fuels European Heatwaves: Study
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- Study authors identified an "atmospheric bridge" in which cold meltwater from Greenland lowers North Atlantic sea surface temperatures, creating a sharp temperature front that makes the jet stream wavier and shifts it over Europe.
- The research team found that years of extensive European high-pressure ridging were preceded by summers when an average of 81 billion tonnes more meltwater than usual rushed off the Greenland ice sheet.
- Marilena Oltmanns of the UK's National Oceanography Centre warned that climate models don't fully capture this process, meaning heatwaves and droughts — particularly across the Mediterranean — are likely underestimated.
- The study linked this jet-stream mechanism to the 2003 European heatwave that killed 70,000 people and the 2022 Mediterranean derecho, where fist-sized hail killed 12 people and winds exceeded 60 metres per second.
- John Methven of the University of Reading cautioned that the causal link between the North Atlantic "cold blob" and Greenland meltwater isn't established, noting that AMOC weakening or natural atmospheric shifts could also explain the jet stream's southward drift.
- High-pressure ridges over Europe have been forming more frequently over the past 30 years, channeling warm air from the central Atlantic and Sahara into persistent heat domes.
Why it matters: If Greenland meltwater is reshaping Europe's jet stream, the continent's heatwaves are not just a product of gradual global warming but of a specific, accelerating feedback loop — and the fact that current climate models miss it means governments are preparing for milder extremes than what's coming. Mediterranean nations face the steepest underestimation, with implications for agriculture, water security, and public health planning.
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