Manhattan-Sized Ice Island Breaks Off Greenland's Petermann Glacier

A 76.4 square kilometer ice island has calved from Greenland’s Petermann Glacier. This event marks the largest loss of floating ice from the glacier since 2012. It is also the largest Arctic calving event since 2020. The newly separated tabular iceberg broke away from the glacier's floating ice tongue. It may be up to 150 meters thick.

Scientists tracked the event through satellite observations. Adam Garbo, a PhD student at the University of Ottawa, identified the calving. This discovery is part of a collaboration involving the University of Ottawa, the University of Stirling, Environment and Climate Change Canada, Lancaster University, and the University of Leeds. Researchers had been monitoring the Petermann Glacier since 2019. They observed growing fractures in the ice tongue.

Satellite images from the European Space Agency's Sentinel-1 mission showed deterioration on August three. By August four, the new ice island had fully separated. Large, flat-topped icebergs are common in Antarctica. They are much rarer in the Arctic. Their rarity provides a unique opportunity for researchers. They can study how large Arctic ice masses develop, move, and fragment.

Scientists anticipate further calving events at Petermann Glacier. Two additional large sections of the floating ice tongue are expected to detach. These sections are projected to measure about 94 square kilometers and 84 square kilometers. If all three events occur, approximately 254 square kilometers would be removed. This would reduce the ice tongue by about 22 percent.

This new ice island is important for marine safety. Massive pieces of floating ice can persist for years. They can then fracture into smaller, harder-to-track pieces. Environment and Climate Change Canada is monitoring the ice island's movement. They are evaluating potential risks to vessels and offshore infrastructure. Researchers will continue to monitor the glacier using satellite imagery and aerial observations.