By BECKY BOHRER
JUNEAU, Alaska (AP) — A retreating glacier revealed a new island in Alaska this summer, as lake water filled in to surround a land mass once hugged by ice.
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Pelto for years has used satellite imagery as part of his work chronicling changes in glaciers, and he had been checking images of the area at least once a month as he watched for the separation to occur, he said. It appears to have happened sometime between late July and early August.
Glacier Bay has over 1,000 glaciers, according to the park. While many glaciers in Alaska are retreating, not many new islands of size are revealed by their retreat, Pelto said. Prow Knob is roughly 2 square miles, and its highest point is just over 1,000 feet, he said.
This satellite image provided by NASA Earth Observatory shows the Alsek Glacier in Glacier Bay National Park and Preserve in Alaska around much of a land mass known as Prow Knob, center right, with a lake bordering on one side, July 5, 1984. (NASA Earth Observatory via AP)Imagery from the early 1980s, shared by NASA Earth Observatory, shows the Alsek Glacier largely surrounding Prow Knob, with Alsek Lake on one side. The glacier at that time shared a connection with Grand Plateau Glacier, the images show.
Over time, the lake has expanded as the glaciers have retreated. Alsek Lake is one of three lakes next to glaciers in the region that has seen marked growth since the 1980s, Pelto said.
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