Sr-Nd-Pb Isotope Evidence for Ice-Sheet Presence on Southern Greenland During the Last Interglacial

To ascertain the response of the southern Greenland Ice Sheet (GIS) to a boreal summer climate warmer than at present, we explored whether southern Greenland was deglaciated during the Last Interglacial (LIG), using the Sr-Nd-Pb isotope ratios of silt-sized sediment discharged from southern Greenlan...

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Bibliographic Details
Published in:Science
Main Authors: Colville, Elizabeth J., Carlson, Anders E., Beard, Brian L., Hatfield, Robert G., Stoner, Joseph S., Reyes, Alberto V., Ullman, David J.
Format: Article in Journal/Newspaper
Language:English
Published: 2011
Subjects:
/dk/atira/pure/subjectarea/asjc/1000
name=General
/dk/atira/pure/sustainabledevelopmentgoals/climate_action
name=SDG 13 - Climate Action
Antarctic
Greenland
The Antarctic
Antarc*
Ice Sheet
Online Access:https://pure.qub.ac.uk/en/publications/f22f8251-ca41-49db-81bc-c9f35f4679a0
https://doi.org/10.1126/science.1204673
http://www.scopus.com/inward/record.url?partnerID=yv4JPVwI&eid=2-s2.0-79960959600&md5=cff6a052dfe7105f59637380c4c56dee
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Summary:To ascertain the response of the southern Greenland Ice Sheet (GIS) to a boreal summer climate warmer than at present, we explored whether southern Greenland was deglaciated during the Last Interglacial (LIG), using the Sr-Nd-Pb isotope ratios of silt-sized sediment discharged from southern Greenland. Our isotope data indicate that no single southern Greenland geologic terrane was completely deglaciated during the LIG, similar to the Holocene. Differences in sediment sources during the LIG relative to the early Holocene denote, however, greater southern GIS retreat during the LIG. These results allow the evaluation of a suite of GIS models and are consistent with a GIS contribution of 1.6 to 2.2 meters to the =4-meter LIG sea-level highstand, requiring a significant sea-level contribution from the Antarctic Ice Sheet.

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