NASA Scientists Uncover Hidden Valleys Beneath Greenland's Ice Sheet, Revealing Ancient Topography
NASA scientists have developed a new method to map the bedrock beneath Greenland's vast ice sheet, revealing an expansive network of previously hidden valleys. This innovative technique, called Ice Flow Perturbation Analysis, utilizes subtle bumps and dips on the ice surface, detected by satellites, to infer the shape of the underlying landscape. The new map has identified 1,943 subglacial valleys, with approximately one-third being newly discovered. Furthermore, about half of the valleys previously known, primarily near the ice sheet's edge, are now understood to extend significantly farther inland, in some cases by hundreds of kilometers. This discovery provides a more detailed and accurate view of Greenland's hidden topography, offering new insights into the island's geological history and the formation of its ice sheet. The findings were published in Geophysical Research Letters.
