Deglaciation of northwestern Greenland during Marine Isotope Stage 11.
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| Title: | Deglaciation of northwestern Greenland during Marine Isotope Stage 11. |
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| Authors: | Christ, Andrew J., Rittenour, Tammy M., Bierman, Paul R., Keisling, Benjamin A., Knutz, Paul C., Thomsen, Tonny B., Keulen, Nynke, Fosdick, Julie C., Hemming, Sidney R., Tison, Jean-Louis, Blard, Pierre-Henri, Steffensen, Jørgen P., Caffee, Marc W., Corbett, Lee B., Dahl-Jensen, Dorthe, Dethier, David P., Hidy, Alan J., Perdrial, Nicolas, Peteet, Dorothy M., Steig, Eric J. |
| Source: | Science (pre-March 2025). 7/21/2023, Vol. 381 Issue 6655, p330-335. 6p. 6 Color Photographs. |
| Subjects: | Greenland ice, Ice sheets, Cosmogenic nuclides, Glacial melting, Thermoluminescence dating, Ice cores |
| Geographic Terms: | Greenland |
| Abstract: | Past interglacial climates with smaller ice sheets offer analogs for ice sheet response to future warming and contributions to sea level rise; however, well-dated geologic records from formerly ice-free areas are rare. Here we report that subglacial sediment from the Camp Century ice core preserves direct evidence that northwestern Greenland was ice free during the Marine Isotope Stage (MIS) 11 interglacial. Luminescence dating shows that sediment just beneath the ice sheet was deposited by flowing water in an ice-free environment 416 ± 38 thousand years ago. Provenance analyses and cosmogenic nuclide data and calculations suggest the sediment was reworked from local materials and exposed at the surface <16 thousand years before deposition. Ice sheet modeling indicates that ice-free conditions at Camp Century require at least 1.4 meters of sea level equivalent contribution from the Greenland Ice Sheet. [ABSTRACT FROM AUTHOR] |
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| Database: | Psychology and Behavioral Sciences Collection |
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| Abstract: | Past interglacial climates with smaller ice sheets offer analogs for ice sheet response to future warming and contributions to sea level rise; however, well-dated geologic records from formerly ice-free areas are rare. Here we report that subglacial sediment from the Camp Century ice core preserves direct evidence that northwestern Greenland was ice free during the Marine Isotope Stage (MIS) 11 interglacial. Luminescence dating shows that sediment just beneath the ice sheet was deposited by flowing water in an ice-free environment 416 ± 38 thousand years ago. Provenance analyses and cosmogenic nuclide data and calculations suggest the sediment was reworked from local materials and exposed at the surface <16 thousand years before deposition. Ice sheet modeling indicates that ice-free conditions at Camp Century require at least 1.4 meters of sea level equivalent contribution from the Greenland Ice Sheet. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00368075 |
| DOI: | 10.1126/science.ade4248 |
