Did you know that Antarctica's glaciers might be secretly triggering powerful underwater tsunamis? It’s a phenomenon that could reshape our understanding of ocean dynamics and climate change. An international team of researchers, spearheaded by the British Antarctic Survey (BAS), is diving deep into this mystery, exploring how the dramatic process of glacier calving—where massive icebergs break off and plunge into the ocean—can generate hidden waves with far-reaching impacts.
But here's where it gets controversial: while we’ve long believed that wind, tides, and surface heat loss drive ocean mixing, these underwater tsunamis might be just as influential—if not more so—in certain polar regions. These waves, often towering several meters high, churn together different layers of water, redistributing heat, oxygen, and nutrients in ways critical for marine life and climate regulation. Could this overlooked process be a missing piece in our climate puzzle?
The discovery of these tsunamis was serendipitous. During a previous expedition aboard the RRS James Clark Ross, led by Professor James Scourse of the University of Exeter, researchers collected ocean data before, during, and after a calving event. Now, scientists at the Rothera Research Station on the Antarctic Peninsula and aboard the RRS Sir David Attenborough are doubling down on their efforts to uncover the secrets of these underwater waves.
Professor Michael Meredith, an oceanographer at BAS, is at the helm of this research. He explains, 'We’re trying to answer fundamental questions: What drives these tsunamis? How do they differ depending on the type of calving or seasonal conditions? And what does their mixing do to polar climates and ecosystems?' Professor Katy Sheen, an oceanographer at Exeter, is co-leading a portion of the project, focusing on the various 'flavors' of tsunamis generated by glacial calving. 'The fieldwork at Rothera is thrilling,' she says. 'We’re using remote cameras, underwater microphones, autonomous vehicles, and moored instruments to capture every detail of these events and their impacts on local chemistry and biology.'
And this is the part most people miss: the implications of these tsunamis could be massive. Increased ocean mixing might pull warmer water from deeper layers, accelerating the melting of the Antarctic Ice Sheet and raising global sea levels. It could also disrupt nutrient distribution, affecting phytoplankton growth—the foundation of the ocean food chain. Professor Kate Hendry, a chemical oceanographer at BAS, puts it bluntly: 'Antarctica’s processes, from ice to ocean, are connected to our daily lives. Rising seas, shifting weather—it all starts here.'
The POLOMINTS project, a collaboration involving institutions like the University of Southampton, the National Oceanography Centre, and international partners from the U.S. and Poland, is deploying cutting-edge technology to study these events in unprecedented detail. Dr. Alexander Brearley, another BAS oceanographer, is using autonomous underwater vehicles to study the Sheldon Glacier’s front, capturing real-time imagery and data on the physical and biological impacts of these tsunamis.
But the biggest question remains: Could a warming climate increase the frequency and intensity of these calving and tsunami events? As scientists refine their models, the answers could reshape our predictions about future climate change. What do you think? Is this a game-changer for our understanding of Antarctica’s role in global climate, or just another piece of the puzzle? Let us know in the comments!
