Manhattan-sized ice island breaks off Greenland’s Petermann Glacier

On August 4, 2026, a massive 76.4 square kilometer ice island broke off from Greenland's Petermann Glacier, marking the largest Arctic calving event since 2020. This tabular iceberg, potentially 150 meters thick, is comparable in size to Manhattan Island, providing scientists with a unique opportunity to study the development and movement of enormous Arctic ice masses.

The calving event was identified by University of Ottawa PhD student Adam Garbo, part of an ongoing collaboration involving several international universities and Canadian and British institutions. Satellite monitoring since 2019 had detected signs of instability in Petermann Glacier's floating ice tongue, anticipating this significant calving for years.

While large, tabular icebergs are common around Antarctica, comparable ice islands in the Arctic are rare, making this event particularly valuable for research into glacier retreat, changing ocean conditions, and the risks posed by drifting ice in polar regions. Scientists expect additional large sections of the glacier's ice tongue to break off in the near future, potentially reducing the ice tongue by about 22 percent.

The newly formed ice island poses potential hazards for Arctic shipping due to its large size and potential to fracture into smaller pieces over time, which could be difficult to track and may pose risks to vessels and offshore infrastructure. Ongoing monitoring by Environment and Climate Change Canada and satellite observations will help assess these risks and contribute to a better understanding of the processes responsible for the calving and retreat of Arctic ice shelves.