Subglacial sediment pathways and deglacial chronology of the northern Barents Sea Ice Sheet
New information is presented on the configuration of the northern Barents Sea Ice Sheet (BSIS) during the last glacial and deglaciation (21–11.5 ka). The glacial dynamics of the BSIS that we discuss are based on clay-mineral compositions of subglacial tills and a distinct kaolinite source in the cen...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/517074/ https://doi.org/10.1111/bor.12248 |
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ftnerc:oai:nora.nerc.ac.uk:517074 2023-05-15T15:38:32+02:00 Subglacial sediment pathways and deglacial chronology of the northern Barents Sea Ice Sheet Hogan, Kelly A. Dowdeswell, Julian A. Hillenbrand, Claus-Dieter Ehrmann, Werner Noormets, Riko Wacker, Lukas 2017-10 http://nora.nerc.ac.uk/id/eprint/517074/ https://doi.org/10.1111/bor.12248 unknown Wiley Hogan, Kelly A. orcid:0000-0002-1256-8010 Dowdeswell, Julian A.; Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Ehrmann, Werner; Noormets, Riko; Wacker, Lukas. 2017 Subglacial sediment pathways and deglacial chronology of the northern Barents Sea Ice Sheet. Boreas, 46 (4). 750-771. https://doi.org/10.1111/bor.12248 <https://doi.org/10.1111/bor.12248> Publication - Article PeerReviewed 2017 ftnerc https://doi.org/10.1111/bor.12248 2023-02-04T19:44:58Z New information is presented on the configuration of the northern Barents Sea Ice Sheet (BSIS) during the last glacial and deglaciation (21–11.5 ka). The glacial dynamics of the BSIS that we discuss are based on clay-mineral compositions of subglacial tills and a distinct kaolinite source in the central Barents Sea where previous workers have placed a large, single ice dome for the last glacial BSIS. Our results, which appear to show that subglacial sediments were sourced locally, suggest that the BSIS consisted at least temporarily of multiple domes and may have been more dynamic than previously thought. New radiocarbon dates are presented along with new ice-extent reconstructions for 16.5–15, 14, 13.5 and 11.5 ka. Our reconstructions add information to previous regional and continental-scale efforts in areas east of Svalbard. Ice retreat in the northern Barents Sea progressed as follows. (i) 19–16.5 ka. Major calving led to dynamic thinning in shelf troughs and was accompanied by significant ice-sheet thinning inland as a result of ice drawdown. (ii) 16.5–15 ka. Rapid ice-margin retreat of between 75–100 km occurred, via lift-off and iceberg calving, in Hinlopen and Kvitøya troughs, as well as major retreat (>300 km) in Franz Victoria Trough (FVT) further east. (iii) 15–13.5 ka. Retreat progressed westwards from the FVT towards Svalbard with troughs east of Svalbard (Kvitøya, Olga, and Erik Eriksen) mostly ice-free by 13.5 ka. (iv) 13.5–11.5 ka. Ice retreated gradually towards residual ice masses on Svalbard, Kong Karls Land and possibly Storbanken. Our data require a modification of earlier views of the BSIS because they point toward a more dynamic ice sheet and decay that, once initiated at the shelf break, was dominated by the withdrawal of ice from the FVT that progressed westwards towards the Svalbard archipelago. Article in Journal/Newspaper Barents Sea Ice Sheet Kong Karls Land Kvitøya Sea ice Storbanken Svalbard Natural Environment Research Council: NERC Open Research Archive Svalbard Barents Sea Svalbard Archipelago Kong Karls Land ENVELOPE(28.000,28.000,78.833,78.833) Storbanken ENVELOPE(33.000,33.000,78.000,78.000) Boreas 46 4 750 771 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
New information is presented on the configuration of the northern Barents Sea Ice Sheet (BSIS) during the last glacial and deglaciation (21–11.5 ka). The glacial dynamics of the BSIS that we discuss are based on clay-mineral compositions of subglacial tills and a distinct kaolinite source in the central Barents Sea where previous workers have placed a large, single ice dome for the last glacial BSIS. Our results, which appear to show that subglacial sediments were sourced locally, suggest that the BSIS consisted at least temporarily of multiple domes and may have been more dynamic than previously thought. New radiocarbon dates are presented along with new ice-extent reconstructions for 16.5–15, 14, 13.5 and 11.5 ka. Our reconstructions add information to previous regional and continental-scale efforts in areas east of Svalbard. Ice retreat in the northern Barents Sea progressed as follows. (i) 19–16.5 ka. Major calving led to dynamic thinning in shelf troughs and was accompanied by significant ice-sheet thinning inland as a result of ice drawdown. (ii) 16.5–15 ka. Rapid ice-margin retreat of between 75–100 km occurred, via lift-off and iceberg calving, in Hinlopen and Kvitøya troughs, as well as major retreat (>300 km) in Franz Victoria Trough (FVT) further east. (iii) 15–13.5 ka. Retreat progressed westwards from the FVT towards Svalbard with troughs east of Svalbard (Kvitøya, Olga, and Erik Eriksen) mostly ice-free by 13.5 ka. (iv) 13.5–11.5 ka. Ice retreated gradually towards residual ice masses on Svalbard, Kong Karls Land and possibly Storbanken. Our data require a modification of earlier views of the BSIS because they point toward a more dynamic ice sheet and decay that, once initiated at the shelf break, was dominated by the withdrawal of ice from the FVT that progressed westwards towards the Svalbard archipelago. |
format |
Article in Journal/Newspaper |
author |
Hogan, Kelly A. Dowdeswell, Julian A. Hillenbrand, Claus-Dieter Ehrmann, Werner Noormets, Riko Wacker, Lukas |
spellingShingle |
Hogan, Kelly A. Dowdeswell, Julian A. Hillenbrand, Claus-Dieter Ehrmann, Werner Noormets, Riko Wacker, Lukas Subglacial sediment pathways and deglacial chronology of the northern Barents Sea Ice Sheet |
author_facet |
Hogan, Kelly A. Dowdeswell, Julian A. Hillenbrand, Claus-Dieter Ehrmann, Werner Noormets, Riko Wacker, Lukas |
author_sort |
Hogan, Kelly A. |
title |
Subglacial sediment pathways and deglacial chronology of the northern Barents Sea Ice Sheet |
title_short |
Subglacial sediment pathways and deglacial chronology of the northern Barents Sea Ice Sheet |
title_full |
Subglacial sediment pathways and deglacial chronology of the northern Barents Sea Ice Sheet |
title_fullStr |
Subglacial sediment pathways and deglacial chronology of the northern Barents Sea Ice Sheet |
title_full_unstemmed |
Subglacial sediment pathways and deglacial chronology of the northern Barents Sea Ice Sheet |
title_sort |
subglacial sediment pathways and deglacial chronology of the northern barents sea ice sheet |
publisher |
Wiley |
publishDate |
2017 |
url |
http://nora.nerc.ac.uk/id/eprint/517074/ https://doi.org/10.1111/bor.12248 |
long_lat |
ENVELOPE(28.000,28.000,78.833,78.833) ENVELOPE(33.000,33.000,78.000,78.000) |
geographic |
Svalbard Barents Sea Svalbard Archipelago Kong Karls Land Storbanken |
geographic_facet |
Svalbard Barents Sea Svalbard Archipelago Kong Karls Land Storbanken |
genre |
Barents Sea Ice Sheet Kong Karls Land Kvitøya Sea ice Storbanken Svalbard |
genre_facet |
Barents Sea Ice Sheet Kong Karls Land Kvitøya Sea ice Storbanken Svalbard |
op_relation |
Hogan, Kelly A. orcid:0000-0002-1256-8010 Dowdeswell, Julian A.; Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Ehrmann, Werner; Noormets, Riko; Wacker, Lukas. 2017 Subglacial sediment pathways and deglacial chronology of the northern Barents Sea Ice Sheet. Boreas, 46 (4). 750-771. https://doi.org/10.1111/bor.12248 <https://doi.org/10.1111/bor.12248> |
op_doi |
https://doi.org/10.1111/bor.12248 |
container_title |
Boreas |
container_volume |
46 |
container_issue |
4 |
container_start_page |
750 |
op_container_end_page |
771 |
_version_ |
1766369556464402432 |