Southwest Greenland ice-sheet retreat during the 8.2 ka cold event
The century-long 8.2 ka cold event interrupted early Holocene boreal warmth and may have halted retreat of Greenland ice-sheet margins during the last deglaciation. Here, we synthesize new and existing glacial geological data to assess the behavior of the southwest Greenland ice sheet during the 8.2...
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ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/93500 2023-05-15T16:23:49+02:00 Southwest Greenland ice-sheet retreat during the 8.2 ka cold event Carlson, AE Reyes, A Sillett, K Wilcken, KM Rood, DH 2021-07-14 http://hdl.handle.net/10044/1/93500 https://doi.org/10.1016/j.quascirev.2021.107101 English eng Elsevier Quaternary Science Reviews: the international multidisciplinary research and review journal 0277-3791 http://hdl.handle.net/10044/1/93500 doi:10.1016/j.quascirev.2021.107101 © 2021 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/ http://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND 10 1 Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology Holocene Glaciology Paleoclimatology Greenland Cosmogenic isotopes 8.2 ka cold event ABRUPT CLIMATE-CHANGE SEA-LEVEL WESTERN GREENLAND DEGLACIATION BE-10 INSTABILITY INSOLATION AGE Paleontology 04 Earth Sciences 21 History and Archaeology Journal Article 2021 ftimperialcol https://doi.org/10.1016/j.quascirev.2021.107101 2022-08-04T22:41:31Z The century-long 8.2 ka cold event interrupted early Holocene boreal warmth and may have halted retreat of Greenland ice-sheet margins during the last deglaciation. Here, we synthesize new and existing glacial geological data to assess the behavior of the southwest Greenland ice sheet during the 8.2 ka cold event. In southwest Greenland near the town of Kangerlussuaq, existing and new 10Be surface exposure ages demonstrate that deposition of the Keglen moraines ended at 8.0 ± 0.1 ka (n = 10, 1 outlier), with prior studies arguing that these moraines represented an ice-margin stillstand in response to the 8.2 ka cold event. However, new 10Be ages show that the southwest Greenland ice-sheet margin retreated from the Umîvît moraines, which lie 5–10 km outboard of the Keglen moraines, at 8.2 ± 0.2 ka (n = 11). Accordingly, we suggest that the southwest Greenland ice-sheet margin in the Kangerlussuaq region retreated 5–10 km during the 8.2 ka cold event. Farther south and inland from Nuuk, new 10Be boulder-on-bedrock ages adjacent to the modern ice-sheet margin demonstrate that the ice-margin was retreating with no moraine deposition at 8.2 ± 0.1 ka (n = 4, 1 outlier), with this retreat continuing up to at least ∼7.5 ka according to an existing threshold lake record. Therefore, we propose that the southwest Greenland ice-sheet margin underwent continued retreat during the 8.2 ka cold event in response to elevated early Holocene boreal summer insolation that overwhelmed the impacts from century-scale cooling. Caution should be used in assuming climatic causation for moraine deposition based on temporal correlation. Article in Journal/Newspaper Greenland Ice Sheet Kangerlussuaq Nuuk Imperial College London: Spiral Greenland Kangerlussuaq ENVELOPE(-55.633,-55.633,72.633,72.633) Keglen ENVELOPE(-32.067,-32.067,67.867,67.867) Nuuk ENVELOPE(-52.150,-52.150,68.717,68.717) Quaternary Science Reviews 268 107101 |
institution |
Open Polar |
collection |
Imperial College London: Spiral |
op_collection_id |
ftimperialcol |
language |
English |
topic |
Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology Holocene Glaciology Paleoclimatology Greenland Cosmogenic isotopes 8.2 ka cold event ABRUPT CLIMATE-CHANGE SEA-LEVEL WESTERN GREENLAND DEGLACIATION BE-10 INSTABILITY INSOLATION AGE Paleontology 04 Earth Sciences 21 History and Archaeology |
spellingShingle |
Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology Holocene Glaciology Paleoclimatology Greenland Cosmogenic isotopes 8.2 ka cold event ABRUPT CLIMATE-CHANGE SEA-LEVEL WESTERN GREENLAND DEGLACIATION BE-10 INSTABILITY INSOLATION AGE Paleontology 04 Earth Sciences 21 History and Archaeology Carlson, AE Reyes, A Sillett, K Wilcken, KM Rood, DH Southwest Greenland ice-sheet retreat during the 8.2 ka cold event |
topic_facet |
Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology Holocene Glaciology Paleoclimatology Greenland Cosmogenic isotopes 8.2 ka cold event ABRUPT CLIMATE-CHANGE SEA-LEVEL WESTERN GREENLAND DEGLACIATION BE-10 INSTABILITY INSOLATION AGE Paleontology 04 Earth Sciences 21 History and Archaeology |
description |
The century-long 8.2 ka cold event interrupted early Holocene boreal warmth and may have halted retreat of Greenland ice-sheet margins during the last deglaciation. Here, we synthesize new and existing glacial geological data to assess the behavior of the southwest Greenland ice sheet during the 8.2 ka cold event. In southwest Greenland near the town of Kangerlussuaq, existing and new 10Be surface exposure ages demonstrate that deposition of the Keglen moraines ended at 8.0 ± 0.1 ka (n = 10, 1 outlier), with prior studies arguing that these moraines represented an ice-margin stillstand in response to the 8.2 ka cold event. However, new 10Be ages show that the southwest Greenland ice-sheet margin retreated from the Umîvît moraines, which lie 5–10 km outboard of the Keglen moraines, at 8.2 ± 0.2 ka (n = 11). Accordingly, we suggest that the southwest Greenland ice-sheet margin in the Kangerlussuaq region retreated 5–10 km during the 8.2 ka cold event. Farther south and inland from Nuuk, new 10Be boulder-on-bedrock ages adjacent to the modern ice-sheet margin demonstrate that the ice-margin was retreating with no moraine deposition at 8.2 ± 0.1 ka (n = 4, 1 outlier), with this retreat continuing up to at least ∼7.5 ka according to an existing threshold lake record. Therefore, we propose that the southwest Greenland ice-sheet margin underwent continued retreat during the 8.2 ka cold event in response to elevated early Holocene boreal summer insolation that overwhelmed the impacts from century-scale cooling. Caution should be used in assuming climatic causation for moraine deposition based on temporal correlation. |
format |
Article in Journal/Newspaper |
author |
Carlson, AE Reyes, A Sillett, K Wilcken, KM Rood, DH |
author_facet |
Carlson, AE Reyes, A Sillett, K Wilcken, KM Rood, DH |
author_sort |
Carlson, AE |
title |
Southwest Greenland ice-sheet retreat during the 8.2 ka cold event |
title_short |
Southwest Greenland ice-sheet retreat during the 8.2 ka cold event |
title_full |
Southwest Greenland ice-sheet retreat during the 8.2 ka cold event |
title_fullStr |
Southwest Greenland ice-sheet retreat during the 8.2 ka cold event |
title_full_unstemmed |
Southwest Greenland ice-sheet retreat during the 8.2 ka cold event |
title_sort |
southwest greenland ice-sheet retreat during the 8.2 ka cold event |
publisher |
Elsevier |
publishDate |
2021 |
url |
http://hdl.handle.net/10044/1/93500 https://doi.org/10.1016/j.quascirev.2021.107101 |
long_lat |
ENVELOPE(-55.633,-55.633,72.633,72.633) ENVELOPE(-32.067,-32.067,67.867,67.867) ENVELOPE(-52.150,-52.150,68.717,68.717) |
geographic |
Greenland Kangerlussuaq Keglen Nuuk |
geographic_facet |
Greenland Kangerlussuaq Keglen Nuuk |
genre |
Greenland Ice Sheet Kangerlussuaq Nuuk |
genre_facet |
Greenland Ice Sheet Kangerlussuaq Nuuk |
op_source |
10 1 |
op_relation |
Quaternary Science Reviews: the international multidisciplinary research and review journal 0277-3791 http://hdl.handle.net/10044/1/93500 doi:10.1016/j.quascirev.2021.107101 |
op_rights |
© 2021 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/ http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.quascirev.2021.107101 |
container_title |
Quaternary Science Reviews |
container_volume |
268 |
container_start_page |
107101 |
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1766012149294956544 |