Recent findings show that massive underwater waves created by falling icebergs are causing more ice loss in Greenland than we previously understood. Researchers at the University of Zurich and the University of Washington used fiber-optic technology to uncover these movements. This technology helps track the warm water pushing against glacier fronts, intensifying melting in hidden ways.
When large chunks of ice, or “calving,” break off glaciers, it’s dramatic and easy to spot from above. However, what happens underwater has been far trickier to study. By installing a 10-kilometer-long fiber-optic cable on the seafloor, scientists captured data that was once invisible.
“The fiber-optic cable allows us to measure the calving multiplier effect we couldn’t see before,” explained Dominik Gräff, the lead author of the study. It lets us “listen” to both the glacier and the ocean simultaneously, something satellites can’t do.
When an iceberg calms down, it creates surface waves. But these ripples only tell part of the story. Internal waves continue moving underwater for a long time after the surface settles. These waves can be huge, traveling between various water layers. The warmer, denser seawater sinks and keeps flowing toward the glacier base, where it melts the ice from below.
Scientists refer to this as the “calving multiplier effect.” Andreas Vieli, a co-author of the study, elaborates:
“Warmer water increases melt erosion, further weakening the glacier’s edge. This leads to more calving and greater ice loss.”
As the glacier base erodes, more ice breaks off, triggering waves and increasing melting in a continuous cycle. This process is critical because the Greenland ice sheet holds enough ice to raise global sea levels by about seven meters. A recent report from the Intergovernmental Panel on Climate Change (IPCC) indicates that with current warming trends, we might see significant ice loss within a few decades, directly impacting coastal communities worldwide.
The insights gained from this study are vital for understanding the implications of climate change. As more warm water reaches the glaciers, we can expect a ripple effect—literally and figuratively—on global sea levels and local ecosystems.
