Multi-phased deglaciation of south and southeast Greenland controlled by climate and topographic setting
To put recent Greenland Ice Sheet (GrIS) ice loss into a longer-term context, we must understand its behavior during late-glacial and Early Holocene warming. Previous results seem to suggest that there is a large contrast in the timing of deglaciation between South and Southeast Greenland. However,...
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ftuniaarhuspubl:oai:pure.atira.dk:publications/65acd6d8-7b3b-4b19-b9fe-ae55f1636357 2024-06-23T07:53:07+00:00 Multi-phased deglaciation of south and southeast Greenland controlled by climate and topographic setting Levy, Laura B. Larsen, Nicolaj K. Knudsen, Mads F. Egholm, David L. Bjørk, Anders A. Kjeldsen, Kristian K. Kelly, Meredith A. Howley, Jennifer A. Olsen, Jesper Tikhomirov, Dmitry Zimmerman, Susan R.H. Kjær, Kurt H. 2020-08 https://pure.au.dk/portal/en/publications/65acd6d8-7b3b-4b19-b9fe-ae55f1636357 https://doi.org/10.1016/j.quascirev.2020.106454 http://www.scopus.com/inward/record.url?scp=85084251649&partnerID=8YFLogxK eng eng https://pure.au.dk/portal/en/publications/65acd6d8-7b3b-4b19-b9fe-ae55f1636357 info:eu-repo/semantics/restrictedAccess Levy , L B , Larsen , N K , Knudsen , M F , Egholm , D L , Bjørk , A A , Kjeldsen , K K , Kelly , M A , Howley , J A , Olsen , J , Tikhomirov , D , Zimmerman , S R H & Kjær , K H 2020 , ' Multi-phased deglaciation of south and southeast Greenland controlled by climate and topographic setting ' , Quaternary Science Reviews , vol. 242 , 106454 . https://doi.org/10.1016/j.quascirev.2020.106454 Be dating Deglaciation Greenland Ice sheet article 2020 ftuniaarhuspubl https://doi.org/10.1016/j.quascirev.2020.106454 2024-06-04T14:24:06Z To put recent Greenland Ice Sheet (GrIS) ice loss into a longer-term context, we must understand its behavior during late-glacial and Early Holocene warming. Previous results seem to suggest that there is a large contrast in the timing of deglaciation between South and Southeast Greenland. However, because of lack of available data, in particular in Southeast Greenland, it is difficult to assess how the ice sheet responded to major late-glacial and Early Holocene climate changes. In this study, we use 41 new 10 Be ages to constrain the deglaciation chronology in 12 new locations from the coast to the present ice margin in South and Southeast Greenland. We find that South Greenland (south of 61.5°N) deglaciated between ∼14.8 and 11.9 ka, whereas Southeast Greenland (61.5°N to 68.2°N) deglaciated between ∼11.4 and 11.3 ka. The deglaciation of the coastal, low-intermediate topography in South Greenland coincides with increased air surface temperatures during the Bølling-Allerød with fjords continuing to deglaciate into the Early Holocene. In contrast, the ice sheet persisted at the coast until the late-glacial and Early Holocene in Southeast Greenland, likely because of increased precipitation in the high alpine topography and fjord geometry and bathymetry (e.g. width of fjords and presence of sills). This multi-phased deglaciation demonstrates a contrasting response of the southern GrIS to changes in climate and variations in topographic setting, and that the spatial deglaciation of the GrIS was complex and likely did not respond to a single external climate forcing. Article in Journal/Newspaper Greenland Ice Sheet Aarhus University: Research Greenland Quaternary Science Reviews 242 106454 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Be dating Deglaciation Greenland Ice sheet |
spellingShingle |
Be dating Deglaciation Greenland Ice sheet Levy, Laura B. Larsen, Nicolaj K. Knudsen, Mads F. Egholm, David L. Bjørk, Anders A. Kjeldsen, Kristian K. Kelly, Meredith A. Howley, Jennifer A. Olsen, Jesper Tikhomirov, Dmitry Zimmerman, Susan R.H. Kjær, Kurt H. Multi-phased deglaciation of south and southeast Greenland controlled by climate and topographic setting |
topic_facet |
Be dating Deglaciation Greenland Ice sheet |
description |
To put recent Greenland Ice Sheet (GrIS) ice loss into a longer-term context, we must understand its behavior during late-glacial and Early Holocene warming. Previous results seem to suggest that there is a large contrast in the timing of deglaciation between South and Southeast Greenland. However, because of lack of available data, in particular in Southeast Greenland, it is difficult to assess how the ice sheet responded to major late-glacial and Early Holocene climate changes. In this study, we use 41 new 10 Be ages to constrain the deglaciation chronology in 12 new locations from the coast to the present ice margin in South and Southeast Greenland. We find that South Greenland (south of 61.5°N) deglaciated between ∼14.8 and 11.9 ka, whereas Southeast Greenland (61.5°N to 68.2°N) deglaciated between ∼11.4 and 11.3 ka. The deglaciation of the coastal, low-intermediate topography in South Greenland coincides with increased air surface temperatures during the Bølling-Allerød with fjords continuing to deglaciate into the Early Holocene. In contrast, the ice sheet persisted at the coast until the late-glacial and Early Holocene in Southeast Greenland, likely because of increased precipitation in the high alpine topography and fjord geometry and bathymetry (e.g. width of fjords and presence of sills). This multi-phased deglaciation demonstrates a contrasting response of the southern GrIS to changes in climate and variations in topographic setting, and that the spatial deglaciation of the GrIS was complex and likely did not respond to a single external climate forcing. |
format |
Article in Journal/Newspaper |
author |
Levy, Laura B. Larsen, Nicolaj K. Knudsen, Mads F. Egholm, David L. Bjørk, Anders A. Kjeldsen, Kristian K. Kelly, Meredith A. Howley, Jennifer A. Olsen, Jesper Tikhomirov, Dmitry Zimmerman, Susan R.H. Kjær, Kurt H. |
author_facet |
Levy, Laura B. Larsen, Nicolaj K. Knudsen, Mads F. Egholm, David L. Bjørk, Anders A. Kjeldsen, Kristian K. Kelly, Meredith A. Howley, Jennifer A. Olsen, Jesper Tikhomirov, Dmitry Zimmerman, Susan R.H. Kjær, Kurt H. |
author_sort |
Levy, Laura B. |
title |
Multi-phased deglaciation of south and southeast Greenland controlled by climate and topographic setting |
title_short |
Multi-phased deglaciation of south and southeast Greenland controlled by climate and topographic setting |
title_full |
Multi-phased deglaciation of south and southeast Greenland controlled by climate and topographic setting |
title_fullStr |
Multi-phased deglaciation of south and southeast Greenland controlled by climate and topographic setting |
title_full_unstemmed |
Multi-phased deglaciation of south and southeast Greenland controlled by climate and topographic setting |
title_sort |
multi-phased deglaciation of south and southeast greenland controlled by climate and topographic setting |
publishDate |
2020 |
url |
https://pure.au.dk/portal/en/publications/65acd6d8-7b3b-4b19-b9fe-ae55f1636357 https://doi.org/10.1016/j.quascirev.2020.106454 http://www.scopus.com/inward/record.url?scp=85084251649&partnerID=8YFLogxK |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Levy , L B , Larsen , N K , Knudsen , M F , Egholm , D L , Bjørk , A A , Kjeldsen , K K , Kelly , M A , Howley , J A , Olsen , J , Tikhomirov , D , Zimmerman , S R H & Kjær , K H 2020 , ' Multi-phased deglaciation of south and southeast Greenland controlled by climate and topographic setting ' , Quaternary Science Reviews , vol. 242 , 106454 . https://doi.org/10.1016/j.quascirev.2020.106454 |
op_relation |
https://pure.au.dk/portal/en/publications/65acd6d8-7b3b-4b19-b9fe-ae55f1636357 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2020.106454 |
container_title |
Quaternary Science Reviews |
container_volume |
242 |
container_start_page |
106454 |
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1802644611603103744 |