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Glacial history of the Greenland Ice Sheet and a local ice cap in Qaanaaq, northwest Greenland.

Søndergaard, A.S. and Larsen, N.K. and Olsen, J. and Strunk, A. and Woodroffe, S.A. (2019) 'Glacial history of the Greenland Ice Sheet and a local ice cap in Qaanaaq, northwest Greenland.', Journal of quaternary science., 34 (7). pp. 536-547.

Abstract

In this study, we present new information on the glacial history of the Greenland Ice Sheet (GrIS) and a local ice cap in Qaanaaq, northwest Greenland. We use geomorphological mapping, 10Be exposure dating of boulders, analysis of lake cores, and 14C dating of reworked marine molluscs and subfossil plants to constrain the glacial history. Our 14C ages of reworked marine molluscs reveal that the ice extent in the area was at or behind its present‐day position from 42.2 ± 0.4 to 30.6 ± 0.3k cal a BP after which the GrIS expanded to its maximum position during the Last Glacial Maximum. We find evidence of early ice retreat in the deep fjord (Inglefield Bredning) at 11.9 ± 0.6 ka whereas the Taserssuit Valley was deglaciated ~4 ka later at 7.8 ± 0.1k cal a BP. A proglacial lake record suggests that the local ice cap survived the Holocene Thermal Maximum but moss kill‐dates reveal that it was smaller than present for a period of time before 3.3 ± 0.1k until 0.9 ± 0.1k cal a BP, following which the ice in the area expanded towards its Little Ice Age extent.

Item Type:Article
Full text:Publisher-imposed embargo until 31 August 2020.
(AM) Accepted Manuscript
File format - PDF
(27248Kb)
Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1002/jqs.3139
Publisher statement:This is the accepted version of the following article: Søndergaard, A.S. Larsen, N.K. Olsen, J. Strunk, A. & Woodroffe, S.A. (2019). Glacial history of the Greenland Ice Sheet and a local ice cap in Qaanaaq, northwest Greenland. Journal of Quaternary Science 34(7): 536-547 which has been published in final form at https://doi.org/10.1002/jqs.3139. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for self-archiving.
Date accepted:12 July 2019
Date deposited:20 August 2019
Date of first online publication:31 August 2019
Date first made open access:31 August 2020

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