Preprints
https://doi.org/10.5194/egusphere-2025-2780
https://doi.org/10.5194/egusphere-2025-2780
30 Jun 2025
 | 30 Jun 2025

East Greenland Ice Sheet retreat history during the last deglaciation

Jacob T. H. Anderson, Nicolás E. Young, Allie Balter-Kennedy, Karlee K. Prince, Caleb K. Walcott-George, Brandon L. Graham, Joanna Charton, Jason P. Briner, and Joerg M. Schaefer

Abstract. The lack of geological constraints on past ice-sheet change in marine-based sectors of the Greenland Ice Sheet (GrIS) following the Last Glacial Maximum limits our ability to assess (1) the drivers of ice-sheet change, and (2) the performance of ice-sheet models that are benchmarked against the paleo-record of GrIS change. Here, we provide new in situ 10Be surface exposure chronologies of ice-sheet margin retreat from the outer Scoresby Sund and Storstrømmen Glacier regions in eastern and northeastern Greenland, respectively. Ice retreated from Rathbone Island, east of Scoresby Sund, by ~14.1 ka, recording some of the earliest documentations of terrestrial deglaciation in Greenland. The mouth of Scoresby Sund deglaciated by ~13.2 ka, and retreated at an average rate of ~43 m/yr between 13.2 ka and 9.7 ka. Storstrømmen Glacier retreated from the outer coast to within ~3 km of the modern ice margin between ~12.7 ka and 8.6 ka at an average rate of ~28 m/yr. Retreat then slowed or reached a stillstand as ice retreated ~3 km between ~8.6 ka to the modern ice margin at ~8.0 ka. These retreat rates are consistent with late glacial and Holocene estimates for marine-terminating outlet glaciers across East Greenland, and comparable to modern retreat rates observed at the largest ice streams in northeastern, and northwestern Greenland.

Competing interests: This information product has been peer reviewed and approved for publication as a preprint by the U.S. Geological Survey.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this paper. While Copernicus Publications makes every effort to include appropriate place names, the final responsibility lies with the authors. Views expressed in the text are those of the authors and do not necessarily reflect the views of the publisher.
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Jacob T. H. Anderson, Nicolás E. Young, Allie Balter-Kennedy, Karlee K. Prince, Caleb K. Walcott-George, Brandon L. Graham, Joanna Charton, Jason P. Briner, and Joerg M. Schaefer

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-2780', Anonymous Referee #1, 29 Jul 2025
  • RC2: 'Comment on egusphere-2025-2780', Anonymous Referee #2, 01 Aug 2025
  • CC1: 'Comment on egusphere-2025-2780', Meredith Kelly, 25 Aug 2025

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-2780', Anonymous Referee #1, 29 Jul 2025
  • RC2: 'Comment on egusphere-2025-2780', Anonymous Referee #2, 01 Aug 2025
  • CC1: 'Comment on egusphere-2025-2780', Meredith Kelly, 25 Aug 2025
Jacob T. H. Anderson, Nicolás E. Young, Allie Balter-Kennedy, Karlee K. Prince, Caleb K. Walcott-George, Brandon L. Graham, Joanna Charton, Jason P. Briner, and Joerg M. Schaefer
Jacob T. H. Anderson, Nicolás E. Young, Allie Balter-Kennedy, Karlee K. Prince, Caleb K. Walcott-George, Brandon L. Graham, Joanna Charton, Jason P. Briner, and Joerg M. Schaefer

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Short summary
We investigated retreat of the Greenland Ice Sheet during the last deglaciation by dating glacial deposits exposed as the ice margin retreated. Our results from eastern and northeastern Greenland reveal ice margin retreat rates of 43 m/yr and 28 m/yr at two marine-terminating outlet glaciers. These retreat rates are consistent with late glacial and Holocene estimates across East Greenland, and are comparable to modern retreat rates observed in northeastern and northwestern Greenland.
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