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NASA satellites spot brand-new island in Alaska fashioned by melting glacier (images)

September 14, 2025
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NASA satellites spot brand-new island in Alaska fashioned by melting glacier (images)
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two satellite photos of a lake; on the left, much of the surface is covered in ice. on the right, the ice has frozen to reveal blue water and a previously unseen island

Alaska’s Alsek Glacier has retreated greater than 3 miles (5 kilometers) since 1984, turning Prow Knob into an island. (Picture credit score: NASA Earth Observatory photographs by Michala Garrison, utilizing Landsat information from the U.S. Geological Survey.)

NASA satellite tv for pc imagery has revealed a brand new island off Alaska’s coast that emerged after long-standing glacial ice melted, isolating a small mountain that was as soon as a part of the mainland.

The island sits in Alsek Lake, the place the Alsek Glacier has been steadily thinning and flooding the area with meltwater. Two Landsat photographs — captured on July 5, 1984 by the TM (Thematic Mapper) on Landsat 5 and on Aug. 6, 2025 by the OLI-2 (Operational Land Imager-2) on Landsat 9 — present the transformation in hanging element, in line with a statement from NASA.

Alsek Glacier as soon as wrapped round a small mountain referred to as Prow Knob. Over the previous 4 many years, each arms of the glacier have retreated more than 3 miles (5 kilometers), carving out a proglacial lake in the process. The recent imagery confirms the glacier has now completely separated from Prow Knob, which is surrounded by water and officially an island, according to the statement.


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Glaciologists have been monitoring Alsek Glacier for decades. In the early 20th century, the glacier is believed to have terminated at Gateway Knob, about 3 miles (5 kilometers) west of Prow Knob on the opposite side of what is now Alsek Lake. Since then, the glacier has continued its steady retreat, with satellite data tracking its transformation.

A satellite image of Alsek lake, showing a small island in the middle called Prow Knob

Alaska’s Alsek Glacier has retreated more than 3 miles (5 kilometers) since 1984, turning Prow Knob into an island. (Image credit: NASA Earth Observatory images by Michala Garrison, using Landsat data from the U.S. Geological Survey.)

The retreating glacier has fueled massive lake expansion. Alsek Lake has grown from roughly 17 square miles (45 square km) in 1984 to about 29 square miles (75 km²) today. Its growth is fed not only by Alsek Glacier’s meltwater but also by nearby proglacial lakes such as Harlequin and Grand Plateau. In fact, Alsek Glacier remained connected with the northern arm of the Grand Plateau Glacier until around 1999, when both ice masses had receded further, creating a major branch of Alsek Lake seen in later satellite images.

The newly emerged island measures about 2 square miles (or 5 square km). Based on satellite imagery, scientists believe it formed sometime between July 13 and Aug. 6, 2025. With the separation of Prow Knob, the glacier is now less stable and more prone to calving, when large chunks of ice break off into the lake, according to the statement.

The emergence of this island reflects the accelerating pace of glacial retreat in Southeast Alaska and its ability to reshape landscapes within decades. Expanding lakes, unstable ice fronts and newly exposed terrain point to significant shifts underway, with researchers warning that continued ice loss in a warming world could alter the region’s hydrology and ecosystems.

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