Petermann Glacier Calves 76-Sq-Km Ice Island as 2 Larger Slabs Threaten to Break Free
Updated
Updated · ScienceDaily · Aug 26
Petermann Glacier Calves 76-Sq-Km Ice Island as 2 Larger Slabs Threaten to Break Free
3 articles · Updated · ScienceDaily · Aug 26
Summary
A 76-square-kilometer section of Petermann Glacier's floating ice tongue broke away on Aug. 4, creating a tabular ice island roughly the size of Manhattan and marking the glacier's biggest calving event since 2012.
Sentinel-1 radar images showed fractures and deformation accelerating in the days and months before the break, with cracks spreading rapidly between Aug. 3 and Aug. 4 after years of growing instability.
Two additional ice islands estimated at 97 and 87 square kilometers could still detach as existing rifts continue to widen across the remaining ice tongue.
Environment and Climate Change Canada is tracking the iceberg because a mass up to 150 meters thick could drift for years, fragment into harder-to-detect pieces and threaten Arctic shipping routes and offshore infrastructure.
The event is the Arctic's largest recorded calving since 2020 and gives scientists a rare chance to study how large Arctic ice islands affect glacier dynamics, sea-level rise and the ocean environment.