Glacial history of Inglefield Land, north Greenland from combined in situ 10Be and 14C 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...
Main Authors: | , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus
2020
|
Subjects: | |
Online Access: | https://hdl.handle.net/20.500.11850/452338 https://doi.org/10.3929/ethz-b-000452338 |
id |
ftethz:oai:www.research-collection.ethz.ch:20.500.11850/452338 |
---|---|
record_format |
openpolar |
spelling |
ftethz:oai:www.research-collection.ethz.ch:20.500.11850/452338 2023-08-20T04:06:42+02:00 Glacial history of Inglefield Land, north Greenland from combined in situ 10Be and 14C exposure dating Søndergaard, Anne S. Larsen, Nicolaj K. Steinemann, Olivia Olsen, Jesper Funder, Svend Egholm, David L. Kjær, Kurt H. 2020 application/application/pdf https://hdl.handle.net/20.500.11850/452338 https://doi.org/10.3929/ethz-b-000452338 en eng Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-16-1999-2020 info:eu-repo/semantics/altIdentifier/wos/000587661700002 http://hdl.handle.net/20.500.11850/452338 doi:10.3929/ethz-b-000452338 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International Climate of the Past, 16 (5) info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftethz https://doi.org/20.500.11850/45233810.3929/ethz-b-00045233810.5194/cp-16-1999-2020 2023-07-30T23:52:50Z 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 6.8 ka, whereas the in situ 14C ages range from ca. 14.2 to 6.7 ka. 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. 8.6–8.3 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. Radiocarbon ages of reworked molluscs and wood fragments show that the ice margin was behind its present-day extent from ca. 5.8 to 0.5 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 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. ... Article in Journal/Newspaper glacier Greenland Humboldt Glacier Ice Sheet Inglefield land Nares strait North Greenland ETH Zürich Research Collection Greenland Inglefield Land ENVELOPE(-69.987,-69.987,78.637,78.637) Nares ENVELOPE(158.167,158.167,-81.450,-81.450) |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
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 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 6.8 ka, whereas the in situ 14C ages range from ca. 14.2 to 6.7 ka. 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. 8.6–8.3 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. Radiocarbon ages of reworked molluscs and wood fragments show that the ice margin was behind its present-day extent from ca. 5.8 to 0.5 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 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. ... |
format |
Article in Journal/Newspaper |
author |
Søndergaard, Anne S. Larsen, Nicolaj K. Steinemann, Olivia Olsen, Jesper Funder, Svend Egholm, David L. Kjær, Kurt H. |
spellingShingle |
Søndergaard, Anne S. Larsen, Nicolaj K. Steinemann, Olivia Olsen, Jesper Funder, Svend Egholm, David L. Kjær, Kurt H. Glacial history of Inglefield Land, north Greenland from combined in situ 10Be and 14C exposure dating |
author_facet |
Søndergaard, Anne S. Larsen, Nicolaj K. Steinemann, Olivia Olsen, Jesper Funder, Svend Egholm, David L. Kjær, Kurt H. |
author_sort |
Søndergaard, Anne S. |
title |
Glacial history of Inglefield Land, north Greenland from combined in situ 10Be and 14C exposure dating |
title_short |
Glacial history of Inglefield Land, north Greenland from combined in situ 10Be and 14C exposure dating |
title_full |
Glacial history of Inglefield Land, north Greenland from combined in situ 10Be and 14C exposure dating |
title_fullStr |
Glacial history of Inglefield Land, north Greenland from combined in situ 10Be and 14C exposure dating |
title_full_unstemmed |
Glacial history of Inglefield Land, north Greenland from combined in situ 10Be and 14C exposure dating |
title_sort |
glacial history of inglefield land, north greenland from combined in situ 10be and 14c exposure dating |
publisher |
Copernicus |
publishDate |
2020 |
url |
https://hdl.handle.net/20.500.11850/452338 https://doi.org/10.3929/ethz-b-000452338 |
long_lat |
ENVELOPE(-69.987,-69.987,78.637,78.637) ENVELOPE(158.167,158.167,-81.450,-81.450) |
geographic |
Greenland Inglefield Land Nares |
geographic_facet |
Greenland Inglefield Land Nares |
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 |
Climate of the Past, 16 (5) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-16-1999-2020 info:eu-repo/semantics/altIdentifier/wos/000587661700002 http://hdl.handle.net/20.500.11850/452338 doi:10.3929/ethz-b-000452338 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_doi |
https://doi.org/20.500.11850/45233810.3929/ethz-b-00045233810.5194/cp-16-1999-2020 |
_version_ |
1774717974486188032 |