In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size
Sometime during the middle to late Holocene (8.2 ka to ∼ 1850–1900 CE), the Greenland Ice Sheet (GrIS) was smaller than its current configuration. Determining the exact dimensions of the Holocene ice-sheet minimum and the duration that the ice margin rested inboard of its current position remains ch...
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Copernicus Publications
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Online Access: | https://doi.org/10.5194/cp-17-419-2021 https://cp.copernicus.org/articles/17/419/2021/ |
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fttriple:oai:gotriple.eu:8jqC4w5ZiUVJ5Pupu8rGs 2023-05-15T16:25:41+02:00 In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size Young, Nicolás E. Lesnek, Alia J. Cuzzone, Josh K. Briner, Jason P. Badgeley, Jessica A. Balter-Kennedy, Alexandra Graham, Brandon L. Cluett, Allison Lamp, Jennifer L. Schwartz, Roseanne Tuna, Thibaut Bard, Edouard Caffee, Marc W. Zimmerman, Susan R. H. Schaefer, Joerg M. 2021-02-17 https://doi.org/10.5194/cp-17-419-2021 https://cp.copernicus.org/articles/17/419/2021/ en eng Copernicus Publications doi:10.5194/cp-17-419-2021 10670/1.n0gcw6 1814-9324 1814-9332 https://cp.copernicus.org/articles/17/419/2021/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2021 fttriple https://doi.org/10.5194/cp-17-419-2021 2023-01-22T17:54:23Z Sometime during the middle to late Holocene (8.2 ka to ∼ 1850–1900 CE), the Greenland Ice Sheet (GrIS) was smaller than its current configuration. Determining the exact dimensions of the Holocene ice-sheet minimum and the duration that the ice margin rested inboard of its current position remains challenging. Contemporary retreat of the GrIS from its historical maximum extent in southwestern Greenland is exposing a landscape that holds clues regarding the configuration and timing of past ice-sheet minima. To quantify the duration of the time the GrIS margin was near its modern extent we develop a new technique for Greenland that utilizes in situ cosmogenic 10Be–14C–26Al in bedrock samples that have become ice-free only in the last few decades due to the retreating ice-sheet margin at Kangiata Nunaata Sermia (n=12 sites, 36 measurements; KNS), southwest Greenland. To maximize the utility of this approach, we refine the deglaciation history of the region with stand-alone 10Be measurements (n=49) and traditional 14C ages from sedimentary deposits contained in proglacial–threshold lakes. We combine our reconstructed ice-margin history in the KNS region with additional geologic records from southwestern Greenland and recent model simulations of GrIS change to constrain the timing of the GrIS minimum in southwest Greenland and the magnitude of Holocene inland GrIS retreat, as well as to explore the regional climate history influencing Holocene ice-sheet behavior. Our 10Be–14C–26Al measurements reveal that (1) KNS retreated behind its modern margin just before 10 ka, but it likely stabilized near the present GrIS margin for several thousand years before retreating farther inland, and (2) pre-Holocene 10Be detected in several of our sample sites is most easily explained by several thousand years of surface exposure during the last interglaciation. Moreover, our new results indicate that the minimum extent of the GrIS likely occurred after ∼5 ka, and the GrIS margin may have approached its eventual historical maximum ... Article in Journal/Newspaper Greenland Ice Sheet Unknown Greenland Climate of the Past 17 1 419 450 |
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fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir Young, Nicolás E. Lesnek, Alia J. Cuzzone, Josh K. Briner, Jason P. Badgeley, Jessica A. Balter-Kennedy, Alexandra Graham, Brandon L. Cluett, Allison Lamp, Jennifer L. Schwartz, Roseanne Tuna, Thibaut Bard, Edouard Caffee, Marc W. Zimmerman, Susan R. H. Schaefer, Joerg M. In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size |
topic_facet |
geo envir |
description |
Sometime during the middle to late Holocene (8.2 ka to ∼ 1850–1900 CE), the Greenland Ice Sheet (GrIS) was smaller than its current configuration. Determining the exact dimensions of the Holocene ice-sheet minimum and the duration that the ice margin rested inboard of its current position remains challenging. Contemporary retreat of the GrIS from its historical maximum extent in southwestern Greenland is exposing a landscape that holds clues regarding the configuration and timing of past ice-sheet minima. To quantify the duration of the time the GrIS margin was near its modern extent we develop a new technique for Greenland that utilizes in situ cosmogenic 10Be–14C–26Al in bedrock samples that have become ice-free only in the last few decades due to the retreating ice-sheet margin at Kangiata Nunaata Sermia (n=12 sites, 36 measurements; KNS), southwest Greenland. To maximize the utility of this approach, we refine the deglaciation history of the region with stand-alone 10Be measurements (n=49) and traditional 14C ages from sedimentary deposits contained in proglacial–threshold lakes. We combine our reconstructed ice-margin history in the KNS region with additional geologic records from southwestern Greenland and recent model simulations of GrIS change to constrain the timing of the GrIS minimum in southwest Greenland and the magnitude of Holocene inland GrIS retreat, as well as to explore the regional climate history influencing Holocene ice-sheet behavior. Our 10Be–14C–26Al measurements reveal that (1) KNS retreated behind its modern margin just before 10 ka, but it likely stabilized near the present GrIS margin for several thousand years before retreating farther inland, and (2) pre-Holocene 10Be detected in several of our sample sites is most easily explained by several thousand years of surface exposure during the last interglaciation. Moreover, our new results indicate that the minimum extent of the GrIS likely occurred after ∼5 ka, and the GrIS margin may have approached its eventual historical maximum ... |
format |
Article in Journal/Newspaper |
author |
Young, Nicolás E. Lesnek, Alia J. Cuzzone, Josh K. Briner, Jason P. Badgeley, Jessica A. Balter-Kennedy, Alexandra Graham, Brandon L. Cluett, Allison Lamp, Jennifer L. Schwartz, Roseanne Tuna, Thibaut Bard, Edouard Caffee, Marc W. Zimmerman, Susan R. H. Schaefer, Joerg M. |
author_facet |
Young, Nicolás E. Lesnek, Alia J. Cuzzone, Josh K. Briner, Jason P. Badgeley, Jessica A. Balter-Kennedy, Alexandra Graham, Brandon L. Cluett, Allison Lamp, Jennifer L. Schwartz, Roseanne Tuna, Thibaut Bard, Edouard Caffee, Marc W. Zimmerman, Susan R. H. Schaefer, Joerg M. |
author_sort |
Young, Nicolás E. |
title |
In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size |
title_short |
In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size |
title_full |
In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size |
title_fullStr |
In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size |
title_full_unstemmed |
In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size |
title_sort |
in situ cosmogenic 10be–14c–26al measurements from recently deglaciated bedrock as a new tool to decipher changes in greenland ice sheet size |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-17-419-2021 https://cp.copernicus.org/articles/17/419/2021/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-17-419-2021 10670/1.n0gcw6 1814-9324 1814-9332 https://cp.copernicus.org/articles/17/419/2021/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-17-419-2021 |
container_title |
Climate of the Past |
container_volume |
17 |
container_issue |
1 |
container_start_page |
419 |
op_container_end_page |
450 |
_version_ |
1766014505009020928 |