Climate and ocean forcing of ice-sheet dynamics along the Svalbard-Barents Sea Ice Sheet during the deglaciation 20,000–10,000 years BP
The last deglaciation, 20,000–10,000 years ago, was a period of global warming and rapidly shrinking ice sheets. It was also climatically unstable and retreats were interrupted by re-advances. Retreat rates and timing relative to climatic changes have therefore been difficult to establish. We here s...
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Online Access: | https://hdl.handle.net/10037/20044 https://doi.org/10.1016/j.qsa.2020.100019 |
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ftunivtroemsoe:oai:munin.uit.no:10037/20044 2023-05-15T13:52:48+02:00 Climate and ocean forcing of ice-sheet dynamics along the Svalbard-Barents Sea Ice Sheet during the deglaciation 20,000–10,000 years BP Rasmussen, Tine Lander Thomsen, Erik 2020-11-11 https://hdl.handle.net/10037/20044 https://doi.org/10.1016/j.qsa.2020.100019 eng eng Elsevier Quaternary Science Advances info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Rasmussen TLR, Thomsen E. Climate and ocean forcing of ice-sheet dynamics along the Svalbard-Barents Sea Ice Sheet during the deglaciation 20,000–10,000 years BP. Quaternary Science Advances. 2020;3 FRIDAID 1856732 https://doi.org/10.1016/j.qsa.2020.100019 2666-0334 https://hdl.handle.net/10037/20044 openAccess Copyright 2020 The Author(s) VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2020 ftunivtroemsoe https://doi.org/10.1016/j.qsa.2020.100019 2021-06-25T17:57:49Z The last deglaciation, 20,000–10,000 years ago, was a period of global warming and rapidly shrinking ice sheets. It was also climatically unstable and retreats were interrupted by re-advances. Retreat rates and timing relative to climatic changes have therefore been difficult to establish. We here study a suite of 12 marine sediment cores from Storfjorden and Storfjorden Trough, Svalbard. The purpose is to reconstruct retreat patterns and retreat rates of a high northern latitude marine-based ice stream from the Svalbard-Barents Sea Ice Sheet in relation to paleoceanographic and paleoclimatic changes. The study is based on abundance and composition of planktic and benthic foraminiferal assemblages, ice rafted debris (IRD), lithology, and 70 AMS-14C dates. For core 460, we also calculate sea surface and bottom water temperatures and bottom water salinity. The results show that retreat rates of the ice shelf and ice streams of Storfjorden Trough/Storfjorden (‘Storfjorden Ice Stream’) closely followed the deglacial atmospheric and ocean temperature changes. During the start of the Bølling interstadial retreat rates in Storfjorden Trough probably exceeded 2.5 km/year and more than 10,000 km2 of ice disappeared almost instantaneously. A similarly rapid retreat occurred at the start of the Holocene interglacial, when 4500 km2 of ice broke up. Maximum rates during the deglaciation match the fastest modern rates from Antarctica and Greenland. Correlation of data show that the ice streams in several fjords from northern Norway retreated simultaneously with the Storfjorden Ice Stream, indicating that temperature was the most important forcing factor of the Svalbard-Barents Sea Ice Sheet during the deglaciation. Article in Journal/Newspaper Antarc* Antarctica Arctic Barents Sea Greenland Ice Sheet Ice Shelf Northern Norway Sea ice Storfjorden Svalbard Svalbard-Barents Sea Ice sheet University of Tromsø: Munin Open Research Archive Barents Sea Greenland Norway Svalbard Quaternary Science Advances 3 100019 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Rasmussen, Tine Lander Thomsen, Erik Climate and ocean forcing of ice-sheet dynamics along the Svalbard-Barents Sea Ice Sheet during the deglaciation 20,000–10,000 years BP |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
description |
The last deglaciation, 20,000–10,000 years ago, was a period of global warming and rapidly shrinking ice sheets. It was also climatically unstable and retreats were interrupted by re-advances. Retreat rates and timing relative to climatic changes have therefore been difficult to establish. We here study a suite of 12 marine sediment cores from Storfjorden and Storfjorden Trough, Svalbard. The purpose is to reconstruct retreat patterns and retreat rates of a high northern latitude marine-based ice stream from the Svalbard-Barents Sea Ice Sheet in relation to paleoceanographic and paleoclimatic changes. The study is based on abundance and composition of planktic and benthic foraminiferal assemblages, ice rafted debris (IRD), lithology, and 70 AMS-14C dates. For core 460, we also calculate sea surface and bottom water temperatures and bottom water salinity. The results show that retreat rates of the ice shelf and ice streams of Storfjorden Trough/Storfjorden (‘Storfjorden Ice Stream’) closely followed the deglacial atmospheric and ocean temperature changes. During the start of the Bølling interstadial retreat rates in Storfjorden Trough probably exceeded 2.5 km/year and more than 10,000 km2 of ice disappeared almost instantaneously. A similarly rapid retreat occurred at the start of the Holocene interglacial, when 4500 km2 of ice broke up. Maximum rates during the deglaciation match the fastest modern rates from Antarctica and Greenland. Correlation of data show that the ice streams in several fjords from northern Norway retreated simultaneously with the Storfjorden Ice Stream, indicating that temperature was the most important forcing factor of the Svalbard-Barents Sea Ice Sheet during the deglaciation. |
format |
Article in Journal/Newspaper |
author |
Rasmussen, Tine Lander Thomsen, Erik |
author_facet |
Rasmussen, Tine Lander Thomsen, Erik |
author_sort |
Rasmussen, Tine Lander |
title |
Climate and ocean forcing of ice-sheet dynamics along the Svalbard-Barents Sea Ice Sheet during the deglaciation 20,000–10,000 years BP |
title_short |
Climate and ocean forcing of ice-sheet dynamics along the Svalbard-Barents Sea Ice Sheet during the deglaciation 20,000–10,000 years BP |
title_full |
Climate and ocean forcing of ice-sheet dynamics along the Svalbard-Barents Sea Ice Sheet during the deglaciation 20,000–10,000 years BP |
title_fullStr |
Climate and ocean forcing of ice-sheet dynamics along the Svalbard-Barents Sea Ice Sheet during the deglaciation 20,000–10,000 years BP |
title_full_unstemmed |
Climate and ocean forcing of ice-sheet dynamics along the Svalbard-Barents Sea Ice Sheet during the deglaciation 20,000–10,000 years BP |
title_sort |
climate and ocean forcing of ice-sheet dynamics along the svalbard-barents sea ice sheet during the deglaciation 20,000–10,000 years bp |
publisher |
Elsevier |
publishDate |
2020 |
url |
https://hdl.handle.net/10037/20044 https://doi.org/10.1016/j.qsa.2020.100019 |
geographic |
Barents Sea Greenland Norway Svalbard |
geographic_facet |
Barents Sea Greenland Norway Svalbard |
genre |
Antarc* Antarctica Arctic Barents Sea Greenland Ice Sheet Ice Shelf Northern Norway Sea ice Storfjorden Svalbard Svalbard-Barents Sea Ice sheet |
genre_facet |
Antarc* Antarctica Arctic Barents Sea Greenland Ice Sheet Ice Shelf Northern Norway Sea ice Storfjorden Svalbard Svalbard-Barents Sea Ice sheet |
op_relation |
Quaternary Science Advances info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Rasmussen TLR, Thomsen E. Climate and ocean forcing of ice-sheet dynamics along the Svalbard-Barents Sea Ice Sheet during the deglaciation 20,000–10,000 years BP. Quaternary Science Advances. 2020;3 FRIDAID 1856732 https://doi.org/10.1016/j.qsa.2020.100019 2666-0334 https://hdl.handle.net/10037/20044 |
op_rights |
openAccess Copyright 2020 The Author(s) |
op_doi |
https://doi.org/10.1016/j.qsa.2020.100019 |
container_title |
Quaternary Science Advances |
container_volume |
3 |
container_start_page |
100019 |
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1766257560703205376 |