Australian researchers have discovered huge underwater lakes beneath the largest glacier in east Antarctica.
The lakes were detected by scientists setting off small explosives 2m below the surface of the Totten glacier and listening to the reflected sound.
The Australian Antarctic Division glaciologist Dr Ben Galton-Fenzi said the research was critical to helping scientists predict how the melting of Antarctic glaciers would change the world’s oceans.
The Totten glacier is 30km wide and up to two kilometres thick, and has the potential to raise sea levels by seven metres.
“The explosives were a sound source for us … and it would then echo off different layers in the ice,” Galton-Fenzi told the Guardian.
“We placed geophones [a series of microphones] along the surface of the glacier to listen to the reflected sound, giving us a picture of what lies beneath the ice.”
He said the speed glaciers travel at is determined by what they move across.
“If there’s bedrock under the glacier, it’s sticky and will move more slowly, but if there’s water or soft sediments, the glacier will move faster,” he said.
Galton-Fenzi said the next step for researchers would be to drill down to take a sample of the lakes but he lamented there was no funding certainty for future research.