New Map Reveals Unprecedented Landscape Beneath Antarctica

A New Map Provides Unique Insights into Antarctica

Until now, many elements of the landscape beneath the frozen surface of Antarctica remained a mystery. A new map has shed light on the features hidden under the Antarctic ice in unparalleled detail, which researchers claim could significantly enhance our understanding of this icy continent.

Scientists utilized satellite data and the physics of glacial motion to determine how the continent might appear beneath the ice. They discovered evidence of thousands of previously unknown hills and ridges, asserting that the maps of hidden mountain ranges in Antarctica are clearer than ever. Although these maps come with uncertainties, researchers believe the new details could provide clues about how Antarctica will respond to climate change and what that means for rising sea levels.

"It's as if you previously had a camera with a pixelated film, and now you have a well-detailed digital image of what’s really happening," said the study leader, Dr. Helen Ockenden, a researcher at the University of Grenoble-Alpes.

Thanks to satellites, scientists have a good understanding of the frozen surface of Antarctica, but what lies beneath remained enigmatic. In fact, more is known about the surfaces of some planets in the Solar System than about most topographies beneath Antarctica's ice cap.

Researchers employed a novel approach, combining their knowledge of the ice surface from satellites with an understanding of its physics and validating these against previous measurements. "It’s a bit like being in a kayak on a river, with rocks beneath the water. Sometimes, the eddies at the surface can provide hints about the rocks below," Ockenden explained.

Even though they were aware of the main mountain ranges in Antarctica, the researchers' new approach revealed tens of thousands of previously undiscovered hills and ridges, along with clearer details around buried mountains and canyons. An intriguing discovery is a deep channel, carved into the Antarctic bedrock in an area known as the Subglacial Maud Basin, which has an average depth of 50m, a width of 6km, and stretches nearly 400km.

The new map developed by researchers is unlikely to be final, as it relies on assumptions about how the ice flows, which comes with uncertainties. However, other scientists agree that, in combination with other studies conducted from the ground, air, and space, these maps are a valuable step forward. "This product is extremely useful," said Dr. Peter Fretwell from the British Antarctic Survey.

A better understanding of all these ridges, hills, mountains, and channels could enhance computer models regarding how Antarctica might change in the future. This is a critical issue for climate science, as the rate of ice melt in Antarctica is considered one of the largest unknowns.