A.S. Søndergaard
Glacial history of the Greenland Ice Sheet and a local ice cap in Qaanaaq, northwest Greenland
Søndergaard, A.S.; Larsen, N.K.; Olsen, J.; Strunk, A.; Woodroffe, S.A.
Authors
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.
Citation
Søndergaard, A., Larsen, N., Olsen, J., Strunk, A., & Woodroffe, S. (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. https://doi.org/10.1002/jqs.3139
Journal Article Type | Article |
---|---|
Acceptance Date | Jul 12, 2019 |
Online Publication Date | Aug 31, 2019 |
Publication Date | Oct 31, 2019 |
Deposit Date | Aug 16, 2019 |
Publicly Available Date | Aug 31, 2020 |
Journal | Journal of Quaternary Science |
Print ISSN | 0267-8179 |
Electronic ISSN | 1099-1417 |
Publisher | Wiley |
Peer Reviewed | Peer Reviewed |
Volume | 34 |
Issue | 7 |
Pages | 536-547 |
DOI | https://doi.org/10.1002/jqs.3139 |
Public URL | https://durham-repository.worktribe.com/output/1295645 |
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Copyright 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.
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