When Glaciers Detour: What Antarctic Ice Flow Changes Mean for Us All

In a striking discovery from West Antarctica, glaciers are not just melting, they’re rerouting. A recent study led by Heather L. Selley from School of Earth and Environment, University of Leeds, UK, published in European Geosciences Union (2025), reveals that the Pope, Smith, and Kohler (PSK) glaciers are undergoing dramatic shifts in flow speed and direction. Between 2005 and 2022, Pope Glacier accelerated by 41%, Smith by 28%, and Kohler East by 17%. Meanwhile, Kohler West showed a rare deceleration of 12%. These changes were most intense near the grounding lines, where speeds surged up to 30%. 

What’s even more remarkable is the rerouting of ice flow up to 100 meters per year from Smith to Kohler Glacier. This kind of short-term directional shift, which scientists described as a “rare event,” highlights how unstable this region of Antarctica has become. 

Researchers link these changes to both long-term ocean warming and short-term pulses of warm water reaching the glacier bases, melting them from below. The Dotson and Crosson ice shelves, which are critical buffers for inland ice, are also thinning and speeding up as a result. 

Why does this matter? Because what happens in Antarctica doesn’t stay in Antarctica. These glaciers are part of the larger Amundsen Sea Embayment, one of the most vulnerable regions to ice loss. If fully destabilized, West Antarctic Ice sheet alone could raise global sea levels by over 3 meters. Even the current shifts, though seemingly small, contribute to rising seas, posing a threat to coastal communities across the globe. 

This research underscores the urgency of tracking not only how much ice we’re losing, but where and how it’s moving. Glacial detours like these are a warning sign of accelerating climate risks that demand immediate international attention.

Feature image: The image depicts the average speed and direction of multiple glaciers flowing into the Crosson and Dotson Ice Shelves in West Antarctica from 2015 to 2022.  Credit: ESA (data source: Selley et al., 2025, University of Leeds) 

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