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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ftcopenhagenunip:oai:pure.atira.dk:publications/2ab7ae58-a623-4454-9174-c8ed90976e88 2024-06-09T07:44:53+00:00 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, David Lundbek Kjær, Kurt Henrik 2020 application/pdf https://curis.ku.dk/portal/da/publications/glacial-history-of-inglefield-land-north-greenland-from-combined-in-situ-10be-and-14c-exposure-dating(2ab7ae58-a623-4454-9174-c8ed90976e88).html https://doi.org/10.5194/cp-16-1999-2020 https://curis.ku.dk/ws/files/252475303/cp_16_1999_2020.pdf eng eng 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 , vol. 16 , no. 5 , pp. 1999-2015 . https://doi.org/10.5194/cp-16-1999-2020 LATE QUATERNARY HISTORY SEA-SURFACE CONDITIONS ICE-SHEET COSMOGENIC C-14 WEST GREENLAND INNUITIAN ICE NARES STRAIT BAFFIN-BAY HOLOCENE EXTRACTION article 2020 ftcopenhagenunip https://doi.org/10.5194/cp-16-1999-2020 2024-05-16T11:29:18Z 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 Be-10 and in situ C-14 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 presentday extent. The Be-10 ages are scattered ranging from ca. 92.7 to 6.8 ka, whereas the in situ C-14 ages range from ca. 14.2 to 6.7 ka. Almost half of the apparent Be-10 ages predate the Last Glacial Maximum and up to 89% are to some degree affected by nuclide inheritance. Based on the few reliable Be-10 ages, the in situ C-14 ages and existing radiocarbon ages from Inglefield Land, we find that the deglaciation along the coast commenced at ca. 8.6-8.3 ka cal BP in the western part and ca. 7.9 ka 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. 8.2 ka at the Humboldt Glacier and ca. 6.7 ka in the central part of Inglefield Land. Radio-carbon ages of reworked molluscs and wood fragments show that the ice margin was behind its present-day extent from ca. 5.8 to 0.5 ka cal BP. After 0.5 ka cal BP, 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 Be-10 ages alone unless they are paired with in situ C-14 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 ... Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin glacier Greenland Humboldt Glacier Ice Sheet Inglefield land Nares strait North Greenland University of Copenhagen: Research Baffin Bay Greenland Inglefield Land ENVELOPE(-69.987,-69.987,78.637,78.637) Nares ENVELOPE(158.167,158.167,-81.450,-81.450) Climate of the Past 16 5 1999 2015 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
LATE QUATERNARY HISTORY SEA-SURFACE CONDITIONS ICE-SHEET COSMOGENIC C-14 WEST GREENLAND INNUITIAN ICE NARES STRAIT BAFFIN-BAY HOLOCENE EXTRACTION |
spellingShingle |
LATE QUATERNARY HISTORY SEA-SURFACE CONDITIONS ICE-SHEET COSMOGENIC C-14 WEST GREENLAND INNUITIAN ICE NARES STRAIT BAFFIN-BAY HOLOCENE EXTRACTION Søndergaard, Anne Sofie Larsen, Nicolaj Krog Steinemann, Olivia Olsen, Jesper Funder, Svend Egholm, David Lundbek Kjær, Kurt Henrik Glacial history of Inglefield Land, north Greenland from combined in situ 10 Be and 14 C exposure dating |
topic_facet |
LATE QUATERNARY HISTORY SEA-SURFACE CONDITIONS ICE-SHEET COSMOGENIC C-14 WEST GREENLAND INNUITIAN ICE NARES STRAIT BAFFIN-BAY HOLOCENE EXTRACTION |
description |
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 Be-10 and in situ C-14 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 presentday extent. The Be-10 ages are scattered ranging from ca. 92.7 to 6.8 ka, whereas the in situ C-14 ages range from ca. 14.2 to 6.7 ka. Almost half of the apparent Be-10 ages predate the Last Glacial Maximum and up to 89% are to some degree affected by nuclide inheritance. Based on the few reliable Be-10 ages, the in situ C-14 ages and existing radiocarbon ages from Inglefield Land, we find that the deglaciation along the coast commenced at ca. 8.6-8.3 ka cal BP in the western part and ca. 7.9 ka 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. 8.2 ka at the Humboldt Glacier and ca. 6.7 ka in the central part of Inglefield Land. Radio-carbon ages of reworked molluscs and wood fragments show that the ice margin was behind its present-day extent from ca. 5.8 to 0.5 ka cal BP. After 0.5 ka cal BP, 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 Be-10 ages alone unless they are paired with in situ C-14 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 ... |
format |
Article in Journal/Newspaper |
author |
Søndergaard, Anne Sofie Larsen, Nicolaj Krog Steinemann, Olivia Olsen, Jesper Funder, Svend Egholm, David Lundbek Kjær, Kurt Henrik |
author_facet |
Søndergaard, Anne Sofie Larsen, Nicolaj Krog Steinemann, Olivia Olsen, Jesper Funder, Svend Egholm, David Lundbek 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://curis.ku.dk/portal/da/publications/glacial-history-of-inglefield-land-north-greenland-from-combined-in-situ-10be-and-14c-exposure-dating(2ab7ae58-a623-4454-9174-c8ed90976e88).html https://doi.org/10.5194/cp-16-1999-2020 https://curis.ku.dk/ws/files/252475303/cp_16_1999_2020.pdf |
long_lat |
ENVELOPE(-69.987,-69.987,78.637,78.637) ENVELOPE(158.167,158.167,-81.450,-81.450) |
geographic |
Baffin Bay Greenland Inglefield Land Nares |
geographic_facet |
Baffin Bay Greenland Inglefield Land Nares |
genre |
Baffin Bay Baffin Bay Baffin glacier Greenland Humboldt Glacier Ice Sheet Inglefield land Nares strait North Greenland |
genre_facet |
Baffin Bay Baffin Bay Baffin 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 , vol. 16 , no. 5 , pp. 1999-2015 . https://doi.org/10.5194/cp-16-1999-2020 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-16-1999-2020 |
container_title |
Climate of the Past |
container_volume |
16 |
container_issue |
5 |
container_start_page |
1999 |
op_container_end_page |
2015 |
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1801373719008903168 |