Earliest Holocene south Greenland ice sheet retreat within its late Holocene extent
Early Holocene summer warmth drove dramatic Greenland ice sheet (GIS) retreat. Subsequent insolation‐driven cooling caused GIS margin readvance to late Holocene maxima, from which ice margins are now retreating. We use 10Be surface exposure ages from four locations between 69.4°N and 61.2°N to date...
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Published in | Geophysical research letters Vol. 41; no. 15; pp. 5514 - 5521 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Washington
Blackwell Publishing Ltd
16.08.2014
John Wiley & Sons, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | Early Holocene summer warmth drove dramatic Greenland ice sheet (GIS) retreat. Subsequent insolation‐driven cooling caused GIS margin readvance to late Holocene maxima, from which ice margins are now retreating. We use 10Be surface exposure ages from four locations between 69.4°N and 61.2°N to date when in the early Holocene south to west GIS margins retreated to within these late Holocene maximum extents. We find that this occurred at 11.1 ± 0.2 ka to 10.6 ± 0.5 ka in south Greenland, significantly earlier than previous estimates, and 6.8 ± 0.1 ka to 7.9 ± 0.1 ka in southwest to west Greenland, consistent with existing 10Be ages. At least in south Greenland, these 10Be ages likely provide a minimum constraint for when on a multicentury timescale summer temperatures after the last deglaciation warmed above late Holocene temperatures in the early Holocene. Current south Greenland ice margin retreat suggests that south Greenland may have now warmed to or above earliest Holocene summer temperatures.
Key Points
South Greenland ice retreated within its near‐present margins 11.1‐10.6 ka
South Greenland ice receded inboard of modern extent 3‐4 ka earlier than west
Current south Greenland summer climate may be similar to that of the early Holocene |
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Bibliography: | ark:/67375/WNG-JLK0GLQF-Z istex:76FD3036C3EC2BDB18BB766B0EF310AD2DF4675A ArticleID:GRL51880 ReadmeFigure S1Figure S2Table S1Table S2Text S1 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0094-8276 1944-8007 |
DOI: | 10.1002/2014GL060800 |