by Rafi Letzter, December 13, 2019 in LiveScience
A new mapping effort revealed critical new details of Antarctica’s hidden land.
A new map of the mountains, valleys and canyons hidden under Antarctica‘s ice has revealed the deepest land on Earth, and will help forecast future ice loss.
The frozen southern continent can look pretty flat and featureless from above. But beneath the ice pack that’s accumulated over the eons, there’s an ancient continent, as textured as any other. And that texture turns out to be very important for predicting how and when ice will flow and which regions of ice are most vulnerable in a warming world. The new NASA map, called BedMachine Antarctica, mixes ice movement measurements, seismic measurements, radar and other data points to create the most detailed picture yet of Antarctica’s hidden features.
Related: 50 Amazing Facts About Antarctica
“Using BedMachine to zoom into particular sectors of Antarctica, you find essential details, such as bumps and hollows beneath the ice that may accelerate, slow down or even stop the retreat of glaciers,” Mathieu Morlighem, an Earth system scientist at the University of California, Irvine and the lead author of a new paper about the map, said in a statement.
The new map, published Dec. 12 in the journal Nature Geoscience, reveals previously unknown topographical features that shape ice flow on the frozen continent.
The previously unknown features have “major implications for glacier response to climate change,” the authors wrote. “For example, glaciers flowing across the Transantarctic Mountains are protected by broad, stabilizing ridges.”
…
Figure 1. Jevrejeva et al., 2014 (red) and Church & White, 2011 (green).
