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A glacier near the edge of the Greenland ice sheet in the vicinity of Prudhoe Dome<\/p>\n
Bonnie Jo Mount\/The Washington Post via Getty Images<\/p>\n<\/p>\n
An ice dome in northern Greenland once melted completely at temperatures the region could experience again this century, a finding that will begin to paint a more accurate picture of how fast the melting Greenland ice sheet could raise global sea levels.<\/p>\n
Researchers drilled 500 metres down through the centre of Prudhoe Dome, a bulge of ice the size of Luxembourg in the north-western corner of Greenland, to collect a 7-metre core of sediment and bedrock. A dating technique using infrared light showed that sand at the surface of the core was bleached by the sun about 7000 years ago. That means the dome was completely melted at that time.<\/p>\n
Summers in the area then were 3\u00b0C to 5\u00b0C warmer than today, temperatures they could reach again by 2100 under human-made climate change.<\/p>\n
\u201cThis is very direct evidence that the ice sheet is as sensitive as we feared to even a relatively small amount of warming that happened in the Holocene,\u201d says Yarrow Axford<\/a> at Northwestern University in Illinois, who was not involved in the research.<\/p>\n The melting of the Greenland ice sheet could unleash anywhere from tens of centimetres to 1 metre of sea level rise this century. To narrow that prediction, scientists need to better understand how fast different parts of the ice sheet will disappear.<\/p>\n The Prudhoe Dome core is the first of several taken by the GreenDrill project, funded by the National Science Foundation and involving researchers at several US universities. They hope to tease information about past climates from the ground under the ice sheet, which researchers have called the least explored part of Earth\u2019s land surface.<\/p>\n Sediment drilled in 1966 from under the ice at Camp Century, a US nuclear-powered military facility that operated for eight years during the cold war, showed that north-western Greenland was ice-free about 400,000 years ago<\/a>. A bedrock core taken in 1993 from under Summit Station, a scientific research facility in the middle of Greenland, proved the entire ice sheet melted away<\/a> as recently as 1.1 million years ago.<\/p>\n But GreenDrill has taken this under-ice work further by sampling several points near the northern coast.<\/p>\n Researchers working at Prudhoe Dome in Greenland<\/p>\n Caleb K. Walcott-George<\/p>\n<\/p>\n \u201cThis question is, when have the edges of Greenland melted in the past?\u201d says Caleb Walcott-George<\/a> at the University of Kentucky, part of the team behind the new research. \u201cBecause this is where\u2026 the first foot of sea level rise will come from.\u201d<\/p>\n There has been some disagreement among ice sheet models about whether northern or southern Greenland will melt sooner in the future. This study adds to growing evidence that warming after the last glacial maximum was earlier and more intense in northern Greenland, says Axford.<\/p>\n A possible reason could be feedbacks like the disappearance of Arctic sea ice, which could have released more ocean heat into the atmosphere in the far north.<\/p>\n![\"Greenland](\"https:\/\/www.europesays.com\/uk\/wp-content\/uploads\/2026\/01\/SEI_279759023.jpg\")
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