Jade S. Bowling, Malcolm McMillan, Amber A. Leeson, Stephen J. Livingstone, Andrew J. Sole, Felix S. L. Ng, Nanna B. Karlsson, Peter Nienow, Karla Boxall, Brice Noël, Michiel R. van den Broeke, Thomas Slater, Jennifer Maddalena, Louise Sandberg Sørensen, Sebastian B. Simonsen, Jérémie Mouginot, Romain Millan, Laura Melling, Liam Taylor, Angelika Humbert
{"title":"格陵兰冰盖表面冰下洪水的爆发","authors":"Jade S. Bowling, Malcolm McMillan, Amber A. Leeson, Stephen J. Livingstone, Andrew J. Sole, Felix S. L. Ng, Nanna B. Karlsson, Peter Nienow, Karla Boxall, Brice Noël, Michiel R. van den Broeke, Thomas Slater, Jennifer Maddalena, Louise Sandberg Sørensen, Sebastian B. Simonsen, Jérémie Mouginot, Romain Millan, Laura Melling, Liam Taylor, Angelika Humbert","doi":"10.1038/s41561-025-01746-9","DOIUrl":null,"url":null,"abstract":"<p>As Earth’s climate warms, surface melting of the Greenland Ice Sheet has intensified, increasing rates of sea-level rise. Observations and theory indicate that meltwater generated at the ice sheet surface can drain to its bed, where it flows relatively unhindered to the ocean. This understanding of water movement within and beneath ice sheets underpins the theoretical models that are used to make projections of ice sheet change. Here we present evidence of a destructive mode of meltwater drainage in Greenland. Using multiple satellite sources, we show that a 90-million-cubic-metre subglacial flood forced its way upwards from the bed, fracturing the ice sheet, and bursting through the surface. This phenomenon was triggered by the rapid drainage of a subglacial lake and occurred in a region where the ice bed was predicted to be frozen. The resulting flood caused a rapid deceleration of the downstream marine-terminating glacier. Our observations reveal a complex, bi-directional coupling between the ice sheet’s surface and basal hydrological systems and demonstrate that extreme hydrological forcing may occur in regions of predicted cold-based ice. Such processes can impact the ice sheet’s dynamics and structural integrity but are not currently considered in ice sheet models.</p>","PeriodicalId":19053,"journal":{"name":"Nature Geoscience","volume":"111 1","pages":""},"PeriodicalIF":16.1000,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Outburst of a subglacial flood from the surface of the Greenland Ice Sheet\",\"authors\":\"Jade S. Bowling, Malcolm McMillan, Amber A. Leeson, Stephen J. Livingstone, Andrew J. Sole, Felix S. L. Ng, Nanna B. Karlsson, Peter Nienow, Karla Boxall, Brice Noël, Michiel R. van den Broeke, Thomas Slater, Jennifer Maddalena, Louise Sandberg Sørensen, Sebastian B. 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Outburst of a subglacial flood from the surface of the Greenland Ice Sheet
As Earth’s climate warms, surface melting of the Greenland Ice Sheet has intensified, increasing rates of sea-level rise. Observations and theory indicate that meltwater generated at the ice sheet surface can drain to its bed, where it flows relatively unhindered to the ocean. This understanding of water movement within and beneath ice sheets underpins the theoretical models that are used to make projections of ice sheet change. Here we present evidence of a destructive mode of meltwater drainage in Greenland. Using multiple satellite sources, we show that a 90-million-cubic-metre subglacial flood forced its way upwards from the bed, fracturing the ice sheet, and bursting through the surface. This phenomenon was triggered by the rapid drainage of a subglacial lake and occurred in a region where the ice bed was predicted to be frozen. The resulting flood caused a rapid deceleration of the downstream marine-terminating glacier. Our observations reveal a complex, bi-directional coupling between the ice sheet’s surface and basal hydrological systems and demonstrate that extreme hydrological forcing may occur in regions of predicted cold-based ice. Such processes can impact the ice sheet’s dynamics and structural integrity but are not currently considered in ice sheet models.
期刊介绍:
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