What's Happening?
A study by the University of California, San Diego, published in Geology, has revealed a hidden layer beneath Greenland's ice sheet that could significantly accelerate ice loss. Using seismic waves generated
by earthquakes, researchers mapped the subsurface, discovering that the foundation of Greenland is more complex and dynamic than previously thought. This unseen layer affects how glaciers move and melt, reshaping predictions for Greenland's contribution to sea-level rise. The study highlights that the ice sheet's movement is influenced by the underlying materials, with some regions being more fluid and changeable, which can speed up glacier flow toward the ocean.
Why It's Important?
This discovery has major implications for global sea-level rise predictions. Greenland has already contributed to a rise in sea levels, and the new findings suggest that future increases could occur faster than current models predict. The study emphasizes the need for more accurate forecasts to ensure the safety of coastal communities worldwide. By understanding the subsurface conditions, scientists can improve models that predict how ice sheets will respond to climate change. This knowledge is crucial for policymakers and planners who need reliable data to prepare for potential impacts on coastal infrastructure and populations.
What's Next?
The researchers call for a denser seismic network to better capture Greenland's subsurface complexity. This would help refine models that integrate both surface and subsurface data, providing more reliable forecasts. As the Arctic continues to warm, areas previously considered stable may begin to shift, adding uncertainty to sea-level predictions. The study's findings underscore the importance of incorporating 'invisible' processes beneath the ice into future models to accurately estimate risks. This approach could lead to a new generation of ice-sheet models that offer better guidance for global climate policy and coastal planning.
