Unprecedented Retreat in a 50-Year Observational Record for Petermann Glacier, North Greenland

Petermann Glacier is a marine-terminating outlet glacier that had a 70 km-long floating ice tongue prior to a∼270 km2 calving event that was observed from satellite sensors in August 2010, shortening the ice tongue by∼27 km. Further, in July 2012, another 10 km was lost through calving. In order to understand these events in perspective, here the authors perform a long-term data analysis of Petermann Glacier calving-front variability and ice...