East Greenland ice core dust record reveals timing of Greenland ice sheet advance and retreat

Marius Folden Simonsen, Giovanni Baccolo, Thomas Blunier, Alejandra Borunda, Barbara Delmonte, Robert Frei, Steven Goldstein, Aslak Grinsted, Helle Astrid Kjær, Todd Sowers, Anders Svensson, Bo Vinther, Diana Vladimirova, Gisela Winckler, Mai Winstrup and Paul Vallelonga ()
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Marius Folden Simonsen: University of Copenhagen
Giovanni Baccolo: University Milano-Bicocca
Thomas Blunier: University of Copenhagen
Alejandra Borunda: Columbia University
Barbara Delmonte: University Milano-Bicocca
Robert Frei: University of Copenhagen
Steven Goldstein: Columbia University
Aslak Grinsted: University of Copenhagen
Helle Astrid Kjær: University of Copenhagen
Todd Sowers: Pennsylvania State University
Anders Svensson: University of Copenhagen
Bo Vinther: University of Copenhagen
Diana Vladimirova: University of Copenhagen
Gisela Winckler: Columbia University
Mai Winstrup: Danish Meteorological Institute
Paul Vallelonga: University of Copenhagen

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Accurate estimates of the past extent of the Greenland ice sheet provide critical constraints for ice sheet models used to determine Greenland’s response to climate forcing and contribution to global sea level. Here we use a continuous ice core dust record from the Renland ice cap on the east coast of Greenland to constrain the timing of changes to the ice sheet margin and relative sea level over the last glacial cycle. During the Holocene and the previous interglacial period (Eemian) the dust record was dominated by coarse particles consistent with rock samples from central East Greenland. From the coarse particle concentration record we infer the East Greenland ice sheet margin advanced from 113.4 ± 0.4 to 111.0 ± 0.4 ka BP during the glacial onset and retreated from 12.1 ± 0.1 to 9.0 ± 0.1 ka BP during the last deglaciation. These findings constrain the possible response of the Greenland ice sheet to climate forcings.

Date: 2019
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DOI: 10.1038/s41467-019-12546-2

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