U of I researchers tune into Turner Glacier’s rapid movement
Scientists uncover how water flow beneath Alaska’s Turner Glacier triggered a dramatic surge in speed
BY Leigh Cooper
Video by Chris Miele, Tim Bartholomaus and Kara Billington
January 14, 2021
After a decade of relative stability, Turner Glacier in southern Alaska shifted from a tortoise to a hare in 2020. It now scoots along at 65 feet a day instead of 3 feet a day. An abrupt, 10-fold increase in a glacier’s speed is referred to as glacial surge. Doctoral student Chris Miele, glaciologist Tim Bartholomaus in the Department of Earth and Spatial Sciences and a team from Boise State University (BSU) visited Turner to learn how water flow under a glacier affects its movement. The team thinks a change in the movement of water under the ice caused Turner’s change in behavior. Water under a glacier could act as a lubricant, allowing the glacier to slide forward easily. Using seismic equipment placed in and around the glacier, the team is effectively “listening” for changes in water flow under the ice. With the world experiencing drastic changes to its frozen ecosystems, understanding glacier dynamics, including how flowing water affects glaciers, will be crucial for estimating the effects of climate change on glaciers, Miele said.
How do you “listen” to water under a glacier?
Chris Miele used seismic tools to understand water flow under Alaska’s Turner Glacier, which may provide insights on how climate change will influence the world’s glaciers.