Reconstructing the retreat dynamics of the Bjørnøyrenna Ice Stream based on new 3D seismic data from the central Barents Sea
Accepted manuscript version. Published version available in Quaternary Science Reviews (2016) 151, p. 212-227. The stability of contemporary ice sheets is influenced by the discharge from ice streams - corridors of fast-flowing ice bounded by ice flowing an order of magnitude slower. Reconstructions...
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Online Access: | https://hdl.handle.net/10037/12883 https://doi.org/10.1016/j.quascirev.2016.09.003 |
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ftunivtroemsoe:oai:munin.uit.no:10037/12883 2023-05-15T14:27:34+02:00 Reconstructing the retreat dynamics of the Bjørnøyrenna Ice Stream based on new 3D seismic data from the central Barents Sea Piasecka, Emilia Daria Winsborrow, Monica Andreassen, Karin Stokes, Chris R. 2016-11-01 https://hdl.handle.net/10037/12883 https://doi.org/10.1016/j.quascirev.2016.09.003 eng eng Elsevier Quaternary Science Reviews info:eu-repo/grantAgreement/EC/FP7-PEOPLE/317217/EU/Glaciated North Atlantic Margins/GLANAM/ info:eu-repo/grantAgreement/RCN/SFF/223259/NorwayCentre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Piasecka, E.D., Winsborrow, M.C.M., Andreassen, K. & Stokes, C.R. (2016). Reconstructing the retreat dynamics of the Bjørnøyrenna Ice Stream based on new 3D seismic data from the central Barents Sea. Quaternary Science Reviews, 151, 212-227. FRIDAID 1385328 doi:10.1016/j.quascirev.2016.09.003 0277-3791 1873-457X https://hdl.handle.net/10037/12883 openAccess Barents Sea Ice Sheet Bjørnøyrenna Ice Stream Last Glacial Maximum Mega-scale glacial lineations Deglaciation VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Journal article Tidsskriftartikkel Peer reviewed 2016 ftunivtroemsoe https://doi.org/10.1016/j.quascirev.2016.09.003 2021-06-25T17:55:30Z Accepted manuscript version. Published version available in Quaternary Science Reviews (2016) 151, p. 212-227. The stability of contemporary ice sheets is influenced by the discharge from ice streams - corridors of fast-flowing ice bounded by ice flowing an order of magnitude slower. Reconstructions of palaeo-ice stream dynamics contribute to our understanding of ice stream sensitivity to the ocean-climate system and can aid in the numerical modelling and prediction of future changes in contemporary ice sheets. Here we use 3D seismic data, covering 13,000 km2 in the central Bjørnøyrenna (Bear Island Trough), Barents Sea, to investigate the record of ice streaming preserved on the seafloor and on a buried palaeo-seafloor surface. The unusually broad coverage and high resolution of the dataset, as well as its location in the central area of the trough, enables improved reconstruction of dynamics of the former Bjørnøyrenna Ice Stream in terms of number of streaming events, their trajectory, and their relative age sequence during deglaciation. Our results reveal major changes in the configuration and flow dynamics of the ice stream, with up to 10 flow-switching events identified. For the first time, we also document ice streaming sourced from the eastern Barents Sea around the time of the LGM. This high degree of flow variability is suggested to have resulted from climate-driven changes in ice sheet geometry (and ice divide migration), and variations in topography that influenced calving at the ice stream terminus. Article in Journal/Newspaper Arctic Barents Sea Bear Island Bjørnøyrenna ice stream Ice Sheet Sea ice University of Tromsø: Munin Open Research Archive Barents Sea Bear Island ENVELOPE(-67.250,-67.250,-68.151,-68.151) Quaternary Science Reviews 151 212 227 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
Barents Sea Ice Sheet Bjørnøyrenna Ice Stream Last Glacial Maximum Mega-scale glacial lineations Deglaciation VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
spellingShingle |
Barents Sea Ice Sheet Bjørnøyrenna Ice Stream Last Glacial Maximum Mega-scale glacial lineations Deglaciation VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Piasecka, Emilia Daria Winsborrow, Monica Andreassen, Karin Stokes, Chris R. Reconstructing the retreat dynamics of the Bjørnøyrenna Ice Stream based on new 3D seismic data from the central Barents Sea |
topic_facet |
Barents Sea Ice Sheet Bjørnøyrenna Ice Stream Last Glacial Maximum Mega-scale glacial lineations Deglaciation VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
description |
Accepted manuscript version. Published version available in Quaternary Science Reviews (2016) 151, p. 212-227. The stability of contemporary ice sheets is influenced by the discharge from ice streams - corridors of fast-flowing ice bounded by ice flowing an order of magnitude slower. Reconstructions of palaeo-ice stream dynamics contribute to our understanding of ice stream sensitivity to the ocean-climate system and can aid in the numerical modelling and prediction of future changes in contemporary ice sheets. Here we use 3D seismic data, covering 13,000 km2 in the central Bjørnøyrenna (Bear Island Trough), Barents Sea, to investigate the record of ice streaming preserved on the seafloor and on a buried palaeo-seafloor surface. The unusually broad coverage and high resolution of the dataset, as well as its location in the central area of the trough, enables improved reconstruction of dynamics of the former Bjørnøyrenna Ice Stream in terms of number of streaming events, their trajectory, and their relative age sequence during deglaciation. Our results reveal major changes in the configuration and flow dynamics of the ice stream, with up to 10 flow-switching events identified. For the first time, we also document ice streaming sourced from the eastern Barents Sea around the time of the LGM. This high degree of flow variability is suggested to have resulted from climate-driven changes in ice sheet geometry (and ice divide migration), and variations in topography that influenced calving at the ice stream terminus. |
format |
Article in Journal/Newspaper |
author |
Piasecka, Emilia Daria Winsborrow, Monica Andreassen, Karin Stokes, Chris R. |
author_facet |
Piasecka, Emilia Daria Winsborrow, Monica Andreassen, Karin Stokes, Chris R. |
author_sort |
Piasecka, Emilia Daria |
title |
Reconstructing the retreat dynamics of the Bjørnøyrenna Ice Stream based on new 3D seismic data from the central Barents Sea |
title_short |
Reconstructing the retreat dynamics of the Bjørnøyrenna Ice Stream based on new 3D seismic data from the central Barents Sea |
title_full |
Reconstructing the retreat dynamics of the Bjørnøyrenna Ice Stream based on new 3D seismic data from the central Barents Sea |
title_fullStr |
Reconstructing the retreat dynamics of the Bjørnøyrenna Ice Stream based on new 3D seismic data from the central Barents Sea |
title_full_unstemmed |
Reconstructing the retreat dynamics of the Bjørnøyrenna Ice Stream based on new 3D seismic data from the central Barents Sea |
title_sort |
reconstructing the retreat dynamics of the bjørnøyrenna ice stream based on new 3d seismic data from the central barents sea |
publisher |
Elsevier |
publishDate |
2016 |
url |
https://hdl.handle.net/10037/12883 https://doi.org/10.1016/j.quascirev.2016.09.003 |
long_lat |
ENVELOPE(-67.250,-67.250,-68.151,-68.151) |
geographic |
Barents Sea Bear Island |
geographic_facet |
Barents Sea Bear Island |
genre |
Arctic Barents Sea Bear Island Bjørnøyrenna ice stream Ice Sheet Sea ice |
genre_facet |
Arctic Barents Sea Bear Island Bjørnøyrenna ice stream Ice Sheet Sea ice |
op_relation |
Quaternary Science Reviews info:eu-repo/grantAgreement/EC/FP7-PEOPLE/317217/EU/Glaciated North Atlantic Margins/GLANAM/ info:eu-repo/grantAgreement/RCN/SFF/223259/NorwayCentre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Piasecka, E.D., Winsborrow, M.C.M., Andreassen, K. & Stokes, C.R. (2016). Reconstructing the retreat dynamics of the Bjørnøyrenna Ice Stream based on new 3D seismic data from the central Barents Sea. Quaternary Science Reviews, 151, 212-227. FRIDAID 1385328 doi:10.1016/j.quascirev.2016.09.003 0277-3791 1873-457X https://hdl.handle.net/10037/12883 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2016.09.003 |
container_title |
Quaternary Science Reviews |
container_volume |
151 |
container_start_page |
212 |
op_container_end_page |
227 |
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1766301363184074752 |