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

Calving Event Details

A massive section of Greenland’s Petermann Glacier has detached, creating a rare Arctic ice island approximately the size of Manhattan. The 76-square-kilometer slab, also described as 29 square miles, broke free from the eastern edge of the glacier on August 4.

Satellites monitored the event as cracks spread rapidly across the ice before the final separation. The breakup was captured by the European Space Agency’s (ESA) Copernicus Sentinel-1 mission. This event represents the largest loss of floating ice from the Petermann Glacier since 2012.

Scientific Context

The detachment occurred after years of growing fractures weakened the glacier’s floating ice tongue. Adam Garbo, a glaciologist from the University of Ottawa, stated that the Petermann Glacier has long been one of Greenland’s largest remaining ice tongues.

"We’ve anticipated this break for years, and seeing it finally happen is remarkable," Garbo said in a statement. Researchers had been watching the development of the ice island for years prior to the August 4 event.

Future Monitoring and Risks

Scientists indicate that the calving process may not be finished, noting that two even larger pieces of ice could eventually follow the initial break.

Researchers now intend to track the newly formed ice island as it drifts through the Arctic. The goals of this monitoring include studying how these drifting sheets move and ultimately break apart. Additionally, officials will track the iceberg's movement to determine if it potentially affects shipping routes.