Beneath the icy surface of Antarctica, a hidden force is reshaping our understanding of the planet—and it’s far more powerful than anyone imagined. An international team of researchers, spearheaded by the British Antarctic Survey (BAS), is diving deep into a phenomenon that has long gone unnoticed: underwater tsunamis triggered by glacier calving. But here’s where it gets controversial—these tsunamis might be as influential as wind-driven mixing in polar oceans, and they could be accelerating the melting of the Antarctic Ice Sheet faster than we thought.
When massive icebergs break away from glaciers and plunge into the ocean—a process known as calving—they unleash colossal underwater waves, often towering several meters high. These waves don’t just crash silently into the depths; they churn together layers of water, creating a powerful mixing effect. This process redistributes heat, oxygen, and nutrients across different ocean depths, playing a critical role in sustaining marine life and regulating the region’s climate. And this is the part most people miss—while wind, tides, and surface heat loss were once thought to be the primary drivers of ocean mixing, these hidden tsunamis are now taking center stage.
The discovery of this phenomenon was serendipitous. During a previous expedition aboard the BAS research ship RRS James Clark Ross, scientists collected ocean data before, during, and after a calving event. Now, armed with cutting-edge technology, researchers at Rothera Research Station and aboard the UK’s polar research ship RRS Sir David Attenborough are delving deeper. Led by Professor Michael Meredith, an oceanographer at BAS, the team is asking bold questions: Do different types of calving produce varying tsunami effects? How do seasonal changes influence their formation? And what does this mixing mean for polar ecosystems and our global climate?
Using satellites, drones, underwater robots, and deep-learning algorithms, the team is mapping glacier fronts in unprecedented detail—even in areas too dangerous for humans. Dr. Alexander Brearley, another BAS oceanographer, is deploying autonomous underwater vehicles to study the Sheldon Glacier’s front, capturing real-time imagery and data on the waves generated by calving events. But what if these tsunamis are speeding up Antarctic ice melt? Increased ocean mixing could pull warmer water from the deep, hastening the ice sheet’s collapse and raising global sea levels. It could also disrupt nutrient distribution, impacting phytoplankton growth—the very foundation of the ocean food chain.
Professor Kate Hendry, a chemical oceanographer at BAS, puts it bluntly: “Antarctica is still one of Earth’s greatest mysteries, and every discovery here ripples back to our daily lives. Rising seas, shifting weather—these aren’t just polar problems; they’re global realities.” The POLOMINTS project, a collaboration involving institutions from the UK, USA, and Poland, is funded by the Natural Environment Research Council to unravel these mysteries. But the biggest question remains: As our climate warms, will calving and tsunami events become more frequent and intense? The answer could reshape our predictions for the future of our planet.
What do you think? Could these underwater tsunamis be a missing piece in the climate puzzle, or are we overestimating their impact? Share your thoughts below—this is one debate you won’t want to miss.
