Gizli vadiler Grönland buzunun altındaki manzarayı yeniden çiziyor

A NASA-led study has produced the most detailed map yet of the bedrock concealed beneath Greenland’s vast ice sheet. The researchers used Ice Flow Perturbation Analysis, which detects faint bumps and dips on the ice surface and works backwards to infer the buried terrain. They manually mapped 1,943 subglacial valleys; roughly one third had not been identified before, while many known valleys extend hundreds of kilometres farther inland than earlier maps suggested. Wide branching angles indicate that groundwater may have helped erode the valleys before the ice sheet formed. Long, unusually straight valleys in west-central Greenland also hint at a tectonic influence that scientists do not yet fully understand. The findings matter beyond reconstructing geological history. Ice becomes thicker and flows faster where valleys channel it, deepening the landscape in turn. A more accurate picture of this topography should therefore improve long-term projections of how retreating ice will move towards Greenland’s interior.