Antarctica’s colossal Thwaites Glacier—popularly known as the “Doomsday Glacier”—is destabilizing and melting at nearly twice the rate previously estimated by climate scientists, according to a landmark study published in the peer-reviewed journal Nature Communications.
The findings warn that unprecedented ice loss from the glacier could drive global sea levels up by as much as 30 millimeters (approximately 1.2 inches) by the year 2100, effectively doubling earlier scientific projections. Researchers noted that even if future atmospheric warming trends were halted immediately, the inertia of ongoing oceanic warming makes this ice loss nearly unavoidable.
Situated in the remote expanses of West Antarctica, the Florida-sized ice formation spans approximately 192,000 square kilometers—a geographic area comparable in scale to Senegal. The groundbreaking research, conducted collaboratively by climate modelers at the University of California and NASA’s Jet Propulsion Laboratory (JPL), utilized advanced computer simulations to assess sub-surface hydrodynamic interactions that traditional models had long underestimated.
Beyond its own immediate mass, Thwaites acts as a critical structural cork or natural dam holding back the broader West Antarctic Ice Sheet. Flanked by neighboring glaciers such as Pine Island, it prevents vast inland reservoirs of ice from sliding directly into the ocean. Glaciologists emphasize that should Thwaites disintegrate, the structural collapse of the surrounding basin could trigger runaway ice sheet loss, posing long-term threats of permanent submergence to low-lying coastal metropolises across the globe.
According to baseline polar observations:
Global Footprint: Thwaites currently accounts for roughly 4 percent of total global sea level rise.
Cumulative Mass Deficit: The glacier has shed over 1 trillion metric tons of ice since the year 2000.
Annual Loss Rate: It continues to lose an estimated 50 billion tons of ice annually.
The primary driver behind this accelerated melting is the encroachment of warming deep-ocean currents driven by human-induced climate change. As fossil-fuel emissions elevate ocean temperatures, relatively warm, dense seawater is channeled directly beneath the glacier’s grounded base, eroding its structural integrity from underneath.
The new modeling builds upon a 2019 NASA discovery of a massive underwater cavity beneath the glacier—measuring roughly two-thirds the size of Manhattan—demonstrating that tidal shifts force warm seawater deep into grounding-line crevices. Corroborating the findings, complementary research from the British Antarctic Survey (BAS) indicates that due to systemic thermal retention in the Southern Ocean, the destabilization process could persist for at least another 150 years even under hypothetical cooling scenarios.
Sources: Nature Communications, NASA Jet Propulsion Laboratory (JPL), University of California, British Antarctic Survey (BAS), and Al Jazeera English.