Giant Petermann Glacier Iceberg Smashes Into Joe Island and Remains Intact

On August 4, a massive iceberg the size of Manhattan broke away from the Petermann Glacier’s floating ice tongue on Greenland’s northwest coast. The new ice island, measuring about 29 square miles (76 km²) and up to 492 feet (150 m) thick, drifted southward at roughly 1.8 miles (3 km) per day. After traveling through Petermann Fjord, it struck the small rocky outcrop known as Joe Island at the mouth of the fjord. Despite the impact, the iceberg did not fragment and continued its southwest trajectory through the Nares Strait.

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Petermann is one of Greenland’s largest marine-terminating glaciers and regularly sheds large icebergs. Notable past events include a 97-square-mile (251 km²) iceberg in 2010 and a 50-square-mile (130 km²) iceberg in 2012. Satellite monitoring of the glacier’s floating tongue has been ongoing since 2019, focusing on fractures and signs of instability.

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The iceberg’s size places it among the glacier’s biggest recent calving events. Its thickness of up to 150 m makes it unusually robust, which likely contributed to its survival after the Joe Island collision. After the impact, wind and surface currents swept the ice island away from the fjord, and satellite imagery shows it pivoting and continuing southwest through the Nares Strait. Ongoing tidal forces, winds, and melting are expected to gradually break the iceberg into smaller pieces.

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Adam Garbo, a doctoral student in glaciology at the University of Ottawa who led the detection team, noted that researchers were closely tracking the iceberg’s interaction with Joe Island and were impressed that it remained intact. Scientists anticipate at least two more calving events in the near future, projected to be about 36.3 square miles (94 km²) and 32.4 square miles (84 km²). These icebergs can travel long distances, posing potential risks to marine activity and infrastructure while delivering fresh meltwater to the ocean.

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