Multiple-stage deglacial retreat of the southern Greenland Ice Sheet linked with Irminger current warm water transport
International audience There is limited knowledge pertaining to the history of the Greenland Ice Sheet (GIS) during the last glacial‐interglacial transition as it retreated from the continental margins to an inland position. Here we use multiproxy data, including ice‐rafted debris (IRD); planktonic...
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Online Access: | https://hal.science/hal-03202300 https://hal.science/hal-03202300/document https://hal.science/hal-03202300/file/2010PA002053.pdf https://doi.org/10.1029/2010PA002053 |
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ftceafr:oai:HAL:hal-03202300v1 2024-09-15T18:04:21+00:00 Multiple-stage deglacial retreat of the southern Greenland Ice Sheet linked with Irminger current warm water transport Knutz, Paul Sicre, Marie-Alexandrine Ebbesen, Hanne Christiansen, Sarah Kuijpers, Antoon Geological Survey of Denmark and Greenland (GEUS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Paléocéanographie (PALEOCEAN) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) IT University of Copenhagen (ITU) 2011 https://hal.science/hal-03202300 https://hal.science/hal-03202300/document https://hal.science/hal-03202300/file/2010PA002053.pdf https://doi.org/10.1029/2010PA002053 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2010PA002053 hal-03202300 https://hal.science/hal-03202300 https://hal.science/hal-03202300/document https://hal.science/hal-03202300/file/2010PA002053.pdf doi:10.1029/2010PA002053 info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.science/hal-03202300 Paleoceanography, 2011, 26 (3), pp.PA3204. ⟨10.1029/2010PA002053⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2011 ftceafr https://doi.org/10.1029/2010PA002053 2024-07-22T13:15:42Z International audience There is limited knowledge pertaining to the history of the Greenland Ice Sheet (GIS) during the last glacial‐interglacial transition as it retreated from the continental margins to an inland position. Here we use multiproxy data, including ice‐rafted debris (IRD); planktonic isotopes; alkenone temperatures; and tephra geochemistry from the northern Labrador Sea, off southwest Greenland, to investigate the deglacial response of the GIS and evaluate its implications for the North Atlantic deglacial development. The results imply that the southern GIS retreated in three successive stages: (1) early deglaciation of the East Greenland margins, by tephra‐rich IRD that embrace Heinrich Event 1; (2) progressive retreat during Allerød culminating in major meltwater releases (δ18O depletion of 1.2‰) at the Allerød–Younger Dryas transition (12.8–13.0 kyr B.P.); and (3) a final stage of glacial recession during the early Holocene (∼9–11 kyr B.P.). Rather than indicating local temperatures of ambient surface water, the alkenones likely were transported to the core site by the Irminger Current. We attribute the timing of GIS retreat to the incursion of warm intermediate waters along the base of grounded glaciers and below floating ice shelves on the continental margin. The results lend support to the view that GIS meltwater presented a forcing factor for the Younger Dryas cooling. Article in Journal/Newspaper East Greenland Greenland Ice Sheet Ice Shelves Labrador Sea North Atlantic HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) Paleoceanography 26 3 n/a n/a |
institution |
Open Polar |
collection |
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
op_collection_id |
ftceafr |
language |
English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Knutz, Paul Sicre, Marie-Alexandrine Ebbesen, Hanne Christiansen, Sarah Kuijpers, Antoon Multiple-stage deglacial retreat of the southern Greenland Ice Sheet linked with Irminger current warm water transport |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience There is limited knowledge pertaining to the history of the Greenland Ice Sheet (GIS) during the last glacial‐interglacial transition as it retreated from the continental margins to an inland position. Here we use multiproxy data, including ice‐rafted debris (IRD); planktonic isotopes; alkenone temperatures; and tephra geochemistry from the northern Labrador Sea, off southwest Greenland, to investigate the deglacial response of the GIS and evaluate its implications for the North Atlantic deglacial development. The results imply that the southern GIS retreated in three successive stages: (1) early deglaciation of the East Greenland margins, by tephra‐rich IRD that embrace Heinrich Event 1; (2) progressive retreat during Allerød culminating in major meltwater releases (δ18O depletion of 1.2‰) at the Allerød–Younger Dryas transition (12.8–13.0 kyr B.P.); and (3) a final stage of glacial recession during the early Holocene (∼9–11 kyr B.P.). Rather than indicating local temperatures of ambient surface water, the alkenones likely were transported to the core site by the Irminger Current. We attribute the timing of GIS retreat to the incursion of warm intermediate waters along the base of grounded glaciers and below floating ice shelves on the continental margin. The results lend support to the view that GIS meltwater presented a forcing factor for the Younger Dryas cooling. |
author2 |
Geological Survey of Denmark and Greenland (GEUS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Paléocéanographie (PALEOCEAN) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) IT University of Copenhagen (ITU) |
format |
Article in Journal/Newspaper |
author |
Knutz, Paul Sicre, Marie-Alexandrine Ebbesen, Hanne Christiansen, Sarah Kuijpers, Antoon |
author_facet |
Knutz, Paul Sicre, Marie-Alexandrine Ebbesen, Hanne Christiansen, Sarah Kuijpers, Antoon |
author_sort |
Knutz, Paul |
title |
Multiple-stage deglacial retreat of the southern Greenland Ice Sheet linked with Irminger current warm water transport |
title_short |
Multiple-stage deglacial retreat of the southern Greenland Ice Sheet linked with Irminger current warm water transport |
title_full |
Multiple-stage deglacial retreat of the southern Greenland Ice Sheet linked with Irminger current warm water transport |
title_fullStr |
Multiple-stage deglacial retreat of the southern Greenland Ice Sheet linked with Irminger current warm water transport |
title_full_unstemmed |
Multiple-stage deglacial retreat of the southern Greenland Ice Sheet linked with Irminger current warm water transport |
title_sort |
multiple-stage deglacial retreat of the southern greenland ice sheet linked with irminger current warm water transport |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.science/hal-03202300 https://hal.science/hal-03202300/document https://hal.science/hal-03202300/file/2010PA002053.pdf https://doi.org/10.1029/2010PA002053 |
genre |
East Greenland Greenland Ice Sheet Ice Shelves Labrador Sea North Atlantic |
genre_facet |
East Greenland Greenland Ice Sheet Ice Shelves Labrador Sea North Atlantic |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.science/hal-03202300 Paleoceanography, 2011, 26 (3), pp.PA3204. ⟨10.1029/2010PA002053⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2010PA002053 hal-03202300 https://hal.science/hal-03202300 https://hal.science/hal-03202300/document https://hal.science/hal-03202300/file/2010PA002053.pdf doi:10.1029/2010PA002053 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2010PA002053 |
container_title |
Paleoceanography |
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26 |
container_issue |
3 |
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1810441836608618496 |