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Deglaciation of northwestern Greenland during Marine Isotope Stage 11

Journal Article · · Science
 [1];  [2];  [1];  [3];  [4];  [4];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [1];  [11];  [12];  [13];  [1];  [14];  [15] more »;  [16] « less
  1. Univ. of Vermont, Burlington, VT (United States)
  2. Utah State Univ., Logan, UT (United States)
  3. Univ. of Texas, Austin, TX (United States)
  4. Geological Survey of Denmark and Greenland (GEUS), Copenhagen (Denmark)
  5. Univ. of Connecticut, Storrs, CT (United States)
  6. Columbia Univ., New York, NY (United States). Lamont-Doherty Earth Observatory
  7. Univ. Libre, Brussels (Belgium)
  8. Université de Lorraine, 54500 Nancy, France.; Univ. Libre, Brussels (Belgium); Universite de Lorraine, Nancy (France); Centre National de la Recherche Scientifique (CNRS) (France)
  9. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
  10. Purdue Univ., West Lafayette, IN (United States)
  11. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.; Univ. of Manitoba, Winnipeg, MB (Canada)
  12. Williams College, Williamstown, MA (United States)
  13. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  14. Columbia Univ., New York, NY (United States). Lamont-Doherty Earth Observatory; NASA Goddard Inst. for Space Studies (GISS), New York, NY (United States)
  15. Univ. of Washington, Seattle, WA (United States)
  16. Univ. at Buffalo, NY (United States)
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.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
GeoCenter Denmark; NSF; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1992577
Report Number(s):
LLNL-JRNL-837984; 1058251
Journal Information:
Science, Journal Name: Science Journal Issue: 6655 Vol. 381; ISSN 0036-8075
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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