The floating ice shelf in front of West Antarctica's Thwaites Glacier is expected to break away during 2026 [2, 3].
The collapse of this ice shelf would remove a critical buffer that slows the flow of the glacier into the ocean. Because the Thwaites Glacier is roughly the size of Britain [1], its destabilization threatens to accelerate the melting of the West Antarctic Ice Sheet.
Researchers said that ongoing warming and destabilization are thinning the ice shelf. This process makes the structure prone to rapid breakup, a development that could trigger a more significant ice-sheet collapse [1, 5]. Currently, the glacier is responsible for about four percent of all global sea-level rise [1].
If the Thwaites Glacier were to collapse entirely, the impact on global coastlines would be severe. Estimates for the resulting sea-level rise vary based on the model used. Some data suggests a rise of 3.3 metres [1], while other projections indicate the increase could reach up to five metres [4].
The glacier has earned the nickname "Doomsday Glacier" due to its potential to cause catastrophic flooding in coastal cities worldwide. Scientists said they continue to monitor the eastern ice shelf as it reaches a critical point of instability this year [2, 3].
“The floating ice shelf in front of West Antarctica's Thwaites Glacier is expected to break away during 2026.”
The potential loss of the Thwaites ice shelf represents a tipping point in polar stability. While the breakup of a floating shelf does not immediately raise sea levels, it removes the 'plug' holding back the massive glacier behind it. If the glacier's flow increases, the resulting sea-level rise would permanently alter global coastlines and threaten low-lying urban infrastructure.
