A modeling study published in June 2025 in Communications Earth & Environmental suggests that the West Antarctic ice sheet could begin an irreversible collapse if ocean temperatures rise between 0 and 0.25 degrees Celsius above current levels. This threshold might already be reached, leading to an estimated 4 meters of sea level rise over centuries and millennia, independent of future emissions cuts.
Researchers from various institutions conducted simulations over 800,000 years to assess past ice sheet responses, finding that warming seawater is eroding ice shelves. This instability could result in a self-sustaining process: once the 0.25°C threshold is crossed, a significant retreat of the grounding line could occur without further external warming.
While this modeling provides valuable insights, it represents just one perspective and is not universally accepted. Other studies have reported differing views on the ice sheet’s current stability. The research highlights concerns over the quick onset of destabilization and the prolonged consequences for sea level rise, emphasizing the importance of ongoing monitoring in areas like the Amundsen Sea, where glaciers are already retreating.
The paper underscores the urgency to understand deep-sea warming trends around Antarctica and the potential impacts on coastal infrastructure over the coming centuries.
Source link
