Glacial history of Inglefield Land, north Greenland from combined in situ 10 Be and 14 C exposure dating
Determining the sensitivity of the Greenland Ice Sheet (GrIS) to Holocene climate changes is a key prerequisite for understanding the future response of the ice sheet to global warming. In this study, we present new information on the Holocene glacial history of the GrIS in Inglefield Land, north Gr...
Published in: | Climate of the Past |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/b6059e0f-f9c0-42ea-883f-9216f7039157 2023-12-31T10:07:07+01:00 Glacial history of Inglefield Land, north Greenland from combined in situ 10 Be and 14 C exposure dating Søndergaard, Anne Sofie Larsen, Nicolaj Krog Steinemann, Olivia Olsen, Jesper Funder, Svend Egholm, D.L. Kjær, Kurt Henrik 2020-10 https://pure.au.dk/portal/da/publications/glacial-history-of-inglefield-land-north-greenland-from-combined-in-situ-10be-and-14c-exposure-dating(b6059e0f-f9c0-42ea-883f-9216f7039157).html https://doi.org/10.5194/cp-16-1999-2020 dan dan https://pure.au.dk/portal/da/publications/glacial-history-of-inglefield-land-north-greenland-from-combined-in-situ-10be-and-14c-exposure-dating(b6059e0f-f9c0-42ea-883f-9216f7039157).html info:eu-repo/semantics/openAccess Søndergaard , A S , Larsen , N K , Steinemann , O , Olsen , J , Funder , S , Egholm , D L & Kjær , K H 2020 , ' Glacial history of Inglefield Land, north Greenland from combined in situ 10 Be and 14 C exposure dating ' , Climate of the Past , bind 16 , nr. 5 , s. 1999–2015 . https://doi.org/10.5194/cp-16-1999-2020 article 2020 ftuniaarhuspubl https://doi.org/10.5194/cp-16-1999-2020 2023-12-07T00:04:19Z Determining the sensitivity of the Greenland Ice Sheet (GrIS) to Holocene climate changes is a key prerequisite for understanding the future response of the ice sheet to global warming. In this study, we present new information on the Holocene glacial history of the GrIS in Inglefield Land, north Greenland. We use 10Be and in situ 14C exposure dating to constrain the timing of deglaciation in the area and radiocarbon dating of reworked molluscs and wood fragments to constrain when the ice sheet retreated behind its present-day extent. The 10Be ages are scattered ranging from ca. 92.7 to 6.8ka, whereas the in situ 14C ages range from ca. 14.2 to 6.7ka. Almost half of the apparent 10Be ages predate the Last Glacial Maximum and up to 89% are to some degree affected by nuclide inheritance. Based on the few reliable 10Be ages, the in situ 14C ages and existing radiocarbon ages from Inglefield Land, we find that the deglaciation along the coast commenced at ca. 8.6-8.3kacalBP in the western part and ca. 7.9ka in the central part, following the opening of Nares Strait and arrival of warm waters. The ice margin reached its present-day position at ca. 8.2ka at the Humboldt Glacier and ca. 6.7ka in the central part of Inglefield Land. Radiocarbon ages of reworked molluscs and wood fragments show that the ice margin was behind its present-day extent from ca. 5.8 to 0.5kacalBP. After 0.5kacalBP, the ice advanced towards its Little Ice Age position. Our results emphasize that the slowly eroding and possibly cold-based ice in north Greenland makes it difficult to constrain the deglaciation history based on 10Be ages alone unless they are paired with in situ 14C ages. Further, combining our findings with those of recently published studies reveals distinct differences between deglaciation patterns of northwest and north Greenland. Deglaciation of the land areas in northwest Greenland occurred earlier than in north Greenland, and periods of restricted ice extent were longer, spanning the Middle and Late Holocene. Overall, this ... Article in Journal/Newspaper glacier Greenland Humboldt Glacier Ice Sheet Inglefield land Nares strait North Greenland Aarhus University: Research Climate of the Past 16 5 1999 2015 |
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Aarhus University: Research |
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ftuniaarhuspubl |
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Danish |
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Determining the sensitivity of the Greenland Ice Sheet (GrIS) to Holocene climate changes is a key prerequisite for understanding the future response of the ice sheet to global warming. In this study, we present new information on the Holocene glacial history of the GrIS in Inglefield Land, north Greenland. We use 10Be and in situ 14C exposure dating to constrain the timing of deglaciation in the area and radiocarbon dating of reworked molluscs and wood fragments to constrain when the ice sheet retreated behind its present-day extent. The 10Be ages are scattered ranging from ca. 92.7 to 6.8ka, whereas the in situ 14C ages range from ca. 14.2 to 6.7ka. Almost half of the apparent 10Be ages predate the Last Glacial Maximum and up to 89% are to some degree affected by nuclide inheritance. Based on the few reliable 10Be ages, the in situ 14C ages and existing radiocarbon ages from Inglefield Land, we find that the deglaciation along the coast commenced at ca. 8.6-8.3kacalBP in the western part and ca. 7.9ka in the central part, following the opening of Nares Strait and arrival of warm waters. The ice margin reached its present-day position at ca. 8.2ka at the Humboldt Glacier and ca. 6.7ka in the central part of Inglefield Land. Radiocarbon ages of reworked molluscs and wood fragments show that the ice margin was behind its present-day extent from ca. 5.8 to 0.5kacalBP. After 0.5kacalBP, the ice advanced towards its Little Ice Age position. Our results emphasize that the slowly eroding and possibly cold-based ice in north Greenland makes it difficult to constrain the deglaciation history based on 10Be ages alone unless they are paired with in situ 14C ages. Further, combining our findings with those of recently published studies reveals distinct differences between deglaciation patterns of northwest and north Greenland. Deglaciation of the land areas in northwest Greenland occurred earlier than in north Greenland, and periods of restricted ice extent were longer, spanning the Middle and Late Holocene. Overall, this ... |
format |
Article in Journal/Newspaper |
author |
Søndergaard, Anne Sofie Larsen, Nicolaj Krog Steinemann, Olivia Olsen, Jesper Funder, Svend Egholm, D.L. Kjær, Kurt Henrik |
spellingShingle |
Søndergaard, Anne Sofie Larsen, Nicolaj Krog Steinemann, Olivia Olsen, Jesper Funder, Svend Egholm, D.L. Kjær, Kurt Henrik Glacial history of Inglefield Land, north Greenland from combined in situ 10 Be and 14 C exposure dating |
author_facet |
Søndergaard, Anne Sofie Larsen, Nicolaj Krog Steinemann, Olivia Olsen, Jesper Funder, Svend Egholm, D.L. Kjær, Kurt Henrik |
author_sort |
Søndergaard, Anne Sofie |
title |
Glacial history of Inglefield Land, north Greenland from combined in situ 10 Be and 14 C exposure dating |
title_short |
Glacial history of Inglefield Land, north Greenland from combined in situ 10 Be and 14 C exposure dating |
title_full |
Glacial history of Inglefield Land, north Greenland from combined in situ 10 Be and 14 C exposure dating |
title_fullStr |
Glacial history of Inglefield Land, north Greenland from combined in situ 10 Be and 14 C exposure dating |
title_full_unstemmed |
Glacial history of Inglefield Land, north Greenland from combined in situ 10 Be and 14 C exposure dating |
title_sort |
glacial history of inglefield land, north greenland from combined in situ 10 be and 14 c exposure dating |
publishDate |
2020 |
url |
https://pure.au.dk/portal/da/publications/glacial-history-of-inglefield-land-north-greenland-from-combined-in-situ-10be-and-14c-exposure-dating(b6059e0f-f9c0-42ea-883f-9216f7039157).html https://doi.org/10.5194/cp-16-1999-2020 |
genre |
glacier Greenland Humboldt Glacier Ice Sheet Inglefield land Nares strait North Greenland |
genre_facet |
glacier Greenland Humboldt Glacier Ice Sheet Inglefield land Nares strait North Greenland |
op_source |
Søndergaard , A S , Larsen , N K , Steinemann , O , Olsen , J , Funder , S , Egholm , D L & Kjær , K H 2020 , ' Glacial history of Inglefield Land, north Greenland from combined in situ 10 Be and 14 C exposure dating ' , Climate of the Past , bind 16 , nr. 5 , s. 1999–2015 . https://doi.org/10.5194/cp-16-1999-2020 |
op_relation |
https://pure.au.dk/portal/da/publications/glacial-history-of-inglefield-land-north-greenland-from-combined-in-situ-10be-and-14c-exposure-dating(b6059e0f-f9c0-42ea-883f-9216f7039157).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-16-1999-2020 |
container_title |
Climate of the Past |
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16 |
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5 |
container_start_page |
1999 |
op_container_end_page |
2015 |
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