Plate Nº 54 · recorded October 10, 2026
Earth & ClimateReported finding
76 km² Ice Island Breaks Off Greenland's Petermann Glacier
A 76.4 km² ice island broke off Greenland's Petermann Glacier on August 4, 2026, the largest loss since 2012. Two more sections may soon detach, removing 22% of the ice tongue.
By James Calloway3 min read544 words
In brief
- A 76.4 km² ice island detached from Petermann Glacier on August 4, 2026 — the largest Arctic calving event since 2020.
- The ice island may be as thick as 150 meters and is roughly comparable in area to Manhattan Island.
- Two additional sections of the ice tongue, measuring about 94 km² and 84 km², are projected to break away in the near future.
- Combined, the three calving events would remove approximately 254 km², about 22% of the remaining ice tongue.
- Environment and Climate Change Canada is monitoring the drifting ice island for hazards to shipping and offshore infrastructure.
A 76.4 km² ice island broke away from Greenland's Petermann Glacier on August 4, 2026, the largest loss of floating ice from the glacier since 2012 and the biggest Arctic calving event recorded since 2020.
What happened at Petermann Glacier?
The newly separated tabular iceberg detached from the glacier's floating ice tongue and may be as thick as 150 meters. Its surface area is roughly comparable to Manhattan Island, giving researchers a rare opportunity to observe how enormous Arctic ice masses develop, drift, and eventually fragment.
Adam Garbo, a PhD student in glaciology at the University of Ottawa's Department of Geography, Environment and Geomatics, identified the event. The work is part of an ongoing collaboration involving the University of Ottawa, the University of Stirling, Environment and Climate Change Canada, Lancaster University, and the University of Leeds.
How did scientists detect the break?
Researchers have tracked Petermann Glacier with long-term satellite observations since 2019. They recorded the expansion of fractures running along the floating ice tongue and watched for signs that a major section might eventually break away.
"Petermann Glacier has long been one of Greenland's largest remaining ice tongues," Garbo said. "We've anticipated this break for years, and seeing it finally happen is remarkable."
Images from the European Space Agency's Sentinel-1 mission showed clear deterioration along the ice tongue's centerline on August 3. By 20:00 UTC on August 4, the new ice island had fully separated from the glacier's eastern side.
Why are Arctic ice islands so rare?
Large, flat-topped icebergs occur frequently around Antarctica. Comparable ice islands appear far less often in northern polar waters.
"While large, tabular icebergs are relatively common in the Southern Ocean that surrounds the Antarctic Ice Sheet, Arctic ice islands are far rarer," said Dr. Anna Crawford of the University of Stirling. "By studying Arctic ice islands, we will gain knowledge that can be transferred across polar regions."
Their rarity and longevity make them especially valuable for studying glacier retreat, changing ocean conditions, and the risks posed by drifting ice.
What could happen next at Petermann?
Scientists expect two additional large sections of the floating ice tongue to detach in the near future. Rifts developing for years continue to cut through the ice.
- The two future ice islands are projected to measure about 94 km² and 84 km².
- All three calving events combined would remove approximately 254 km² from the ice tongue.
- That total represents a reduction of about 22 percent.
Could the new ice island threaten ships?
Massive Arctic ice blocks can stay intact for years while drifting, then gradually fracture into smaller, harder-to-track pieces. Environment and Climate Change Canada is monitoring the ice island's movement, as it has done following previous Arctic calving events.
"These are thick blocks of ice that can drift for years," said Dr. Abigail Dalton of the Canadian Ice Service, Environment and Climate Change Canada. "Over time, they fracture into smaller, harder-to-track pieces that pose hazards to vessels and resource operations."
Garbo and collaborators plan to track the aftermath using satellite imagery, aerial observations, and tracking data. Their broader goal is to understand the processes driving the calving and retreat of Arctic ice shelves.
via uottawa.ca (Original)
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Staff writer covering marketplaces and e-commerce at SciBeat.
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