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This Alaskan Glacier is Moving 100 Times Faster Than Normal

K2 Aviation runs scenic flights around Denali, America’s highest point at 20,310 feet, and transports aspiring summiters to basecamp. On a routine flight in early March this year, pilot Chris Palm noticed something unusual on the flanks of the mountain. The normally uniform Muldrow Glacier was sliced and diced with exceptionally large cracks and crevasses. Not in one spot, but everywhere. The glacier looked like it was falling apart.  The Muldrow is a 39-mile long glacier that starts high on the northeastern slope of Denali and flows into the McKinley River. It’s one of four main routes to the summit (the others are the West Buttress, West Rib, and Cassin Ridge), and for the last 60 years, it has flowed downhill at a rate of 3 to 11 inches per day. It’s now moving at a blistering pace (for a glacier) of 30 to 60 feet per day, or up to 100 times faster than usual. 

An unusually fast glacial pace

An unusually fast glacial pace New York Times Text size Copy shortlink: The Muldrow Glacier on the north side of Denali in Alaska is undergoing a rare surge. In the past few months the 39-mile-long river of ice has been moving as much as 90 feet a day, 100 times its usual speed. Most surges, which typically last only a few months and occur on only about 1% of glaciers worldwide, occur on remote glaciers and are detected only after they ve ended. Because of that relative rarity, scientists haven t been able to study surges enough to explain why they happen or to gauge how climate change may be affecting them.

Denali glacier speeding downhill

Denali glacier speeding downhill By Morgan Krakow, Anchorage Daily News Published: April 20, 2021, 6:02am Share: The view from Eielson visitor center in Denali National Park. (Jeffrey Kreulen/Dreamstime) ANCHORAGE, Alaska A Denali glacier suddenly moving at a speedier clip is intriguing scientists, increasing the risk of nearby flooding and potentially closing off some climbing routes on the mountain this season. Muldrow Glacier which begins on Denali’s northeastern slope and flows to form the McKinley River is experiencing a geologic phenomenon: a surge event. The glacier, which usually moves at an average or slow speed, is now jagged and covered with crevasses as it stretches and moves 50 to 100 times faster than normal, according to the National Park Service.

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