Glacial history of the Greenland Ice Sheet and a local ice cap in Qaanaaq, northwest Greenland
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, 10 Be exposure dating of boulders, analysis of lake cores, and 14 C dating of reworked marine molluscs and...
Published in: | Journal of Quaternary Science |
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crwiley:10.1002/jqs.3139 2024-06-02T08:07:19+00:00 Glacial history of the Greenland Ice Sheet and a local ice cap in Qaanaaq, northwest Greenland Søndergaard, Anne Sofie Larsen, Nicolaj Krog Olsen, Jesper Strunk, Astrid Woodroffe, Sarah Aarhus Universitets Forskningsfond Villum Fonden 2019 http://dx.doi.org/10.1002/jqs.3139 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3139 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3139 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3139 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 34, issue 7, page 536-547 ISSN 0267-8179 1099-1417 journal-article 2019 crwiley https://doi.org/10.1002/jqs.3139 2024-05-03T11:13:47Z 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, 10 Be exposure dating of boulders, analysis of lake cores, and 14 C dating of reworked marine molluscs and subfossil plants to constrain the glacial history. Our 14 C 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. Copyright © 2019 John Wiley & Sons, Ltd. Article in Journal/Newspaper Greenland Ice cap Ice Sheet Qaanaaq Wiley Online Library Greenland Inglefield Bredning ENVELOPE(-67.804,-67.804,77.454,77.454) Qaanaaq ENVELOPE(-69.232,-69.232,77.467,77.467) Journal of Quaternary Science 34 7 536 547 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
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, 10 Be exposure dating of boulders, analysis of lake cores, and 14 C dating of reworked marine molluscs and subfossil plants to constrain the glacial history. Our 14 C 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. Copyright © 2019 John Wiley & Sons, Ltd. |
author2 |
Aarhus Universitets Forskningsfond Villum Fonden |
format |
Article in Journal/Newspaper |
author |
Søndergaard, Anne Sofie Larsen, Nicolaj Krog Olsen, Jesper Strunk, Astrid Woodroffe, Sarah |
spellingShingle |
Søndergaard, Anne Sofie Larsen, Nicolaj Krog Olsen, Jesper Strunk, Astrid Woodroffe, Sarah Glacial history of the Greenland Ice Sheet and a local ice cap in Qaanaaq, northwest Greenland |
author_facet |
Søndergaard, Anne Sofie Larsen, Nicolaj Krog Olsen, Jesper Strunk, Astrid Woodroffe, Sarah |
author_sort |
Søndergaard, Anne Sofie |
title |
Glacial history of the Greenland Ice Sheet and a local ice cap in Qaanaaq, northwest Greenland |
title_short |
Glacial history of the Greenland Ice Sheet and a local ice cap in Qaanaaq, northwest Greenland |
title_full |
Glacial history of the Greenland Ice Sheet and a local ice cap in Qaanaaq, northwest Greenland |
title_fullStr |
Glacial history of the Greenland Ice Sheet and a local ice cap in Qaanaaq, northwest Greenland |
title_full_unstemmed |
Glacial history of the Greenland Ice Sheet and a local ice cap in Qaanaaq, northwest Greenland |
title_sort |
glacial history of the greenland ice sheet and a local ice cap in qaanaaq, northwest greenland |
publisher |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1002/jqs.3139 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3139 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3139 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3139 |
long_lat |
ENVELOPE(-67.804,-67.804,77.454,77.454) ENVELOPE(-69.232,-69.232,77.467,77.467) |
geographic |
Greenland Inglefield Bredning Qaanaaq |
geographic_facet |
Greenland Inglefield Bredning Qaanaaq |
genre |
Greenland Ice cap Ice Sheet Qaanaaq |
genre_facet |
Greenland Ice cap Ice Sheet Qaanaaq |
op_source |
Journal of Quaternary Science volume 34, issue 7, page 536-547 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.3139 |
container_title |
Journal of Quaternary Science |
container_volume |
34 |
container_issue |
7 |
container_start_page |
536 |
op_container_end_page |
547 |
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1800752381242114048 |