Arctic's 'Last Ice Area' vanishing at twice the global polar rate

The Arctic's final stronghold of thick, multiyear sea ice is disappearing at an alarming speed, threatening a critical regulator of the Earth's climate. This region, known as the 'Last Ice Area,' is now losing ice mass at twice the rate of the entire Arctic, according to Kent Moore, a professor of atmospheric physics at the University of Toronto Mississauga.

Located north of Canada and Greenland, the Last Ice Area has historically resisted the summer melts that plague other parts of the polar north. Its stability depends heavily on the formation of 'ice arches' within the Nares Strait. These natural blockages act as a physical plug, modulating the export of sea ice by halting its transport south. When these arches are intact, thick ice remains trapped in the Arctic longer; when they fail, the ice flows into warmer southern waters where it rapidly melts.

The Collapse of the Polar Plug

For decades, the region between the Canadian Arctic Archipelago and Greenland served as a bastion of old, thick ice. However, as global temperatures rise, the environmental conditions required to form and maintain these ice arches are deteriorating. The resulting instability means the 'plug' is failing more frequently, accelerating the drainage of the Arctic's oldest ice reserves into the Atlantic.

Global Climate Implications

The preservation of the Last Ice Area is not merely a local concern but a global necessity. This thick ice is essential for maintaining the Arctic's albedo—the reflectivity of the surface. Because white ice reflects a significant portion of solar radiation back into space, its loss creates a feedback loop: darker open water absorbs more heat, further warming the ocean and accelerating the melt of remaining ice. The collapse of this system could disrupt weather patterns and ecosystems far beyond the polar circle.

The Future of the High North

While the role of the Nares Strait arches is well-documented, the rapid acceleration of ice loss has led to discussions regarding potential interventions. Some observers have questioned whether geoengineering could be used to preserve these blockages, though specific technical methods for artificially stabilizing the arches remain unverified in scientific literature. For now, the focus remains on monitoring the rate of decay in a region that was once thought to be the Arctic's most permanent feature.