Millennial-scale oscillations and an environmental regime shift around the Middle to Late Holocene transition in the North Atlantic region based on a multiproxy record from Isfjorden, West Spitsbergen
Palynological and sedimentological analyses were performed on the sediment core HH16-1205-GC retrieved from the central Isfjorden, West Spitsbergen. The sequence, which spans the last 7000 years, revealed an overall cooling trend with an important climate shift between 4.4 and 3.8 cal. ka BP, in add...
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ftunivgent:oai:archive.ugent.be:8772371 2023-06-11T04:13:20+02:00 Millennial-scale oscillations and an environmental regime shift around the Middle to Late Holocene transition in the North Atlantic region based on a multiproxy record from Isfjorden, West Spitsbergen Brice, Camille de Vernal, Anne Francus, Pierre Forwick, Matthias Nam, Seung-Il 2022 application/pdf https://biblio.ugent.be/publication/8772371 http://hdl.handle.net/1854/LU-8772371 https://doi.org/10.1111/bor.12602 https://biblio.ugent.be/publication/8772371/file/8772372 eng eng https://biblio.ugent.be/publication/8772371 http://hdl.handle.net/1854/LU-8772371 http://dx.doi.org/10.1111/bor.12602 https://biblio.ugent.be/publication/8772371/file/8772372 Creative Commons Attribution-NonCommercial 4.0 International Public License (CC BY-NC 4.0) info:eu-repo/semantics/openAccess BOREAS ISSN: 0300-9483 ISSN: 1502-3885 Earth and Environmental Sciences LAST GLACIAL MAXIMUM DINOFLAGELLATE CYSTS THERMOHALINE CIRCULATION SEDIMENTARY ENVIRONMENTS CLIMATE ICE SVALBARD MARINE WATER PALEOCEANOGRAPHY journalArticle info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2022 ftunivgent https://doi.org/10.1111/bor.12602 2023-05-10T22:52:42Z Palynological and sedimentological analyses were performed on the sediment core HH16-1205-GC retrieved from the central Isfjorden, West Spitsbergen. The sequence, which spans the last 7000 years, revealed an overall cooling trend with an important climate shift between 4.4 and 3.8 cal. ka BP, in addition to millennial-scale oscillations. Sea-surface reconstruction from dinocyst assemblages indicates a decrease in summer sea-surface temperature, from 2.5 to 1.5 degrees C, and primary productivity, from 750 to 650 gC m(-2) a(-1) over the last 7000 years. From around 6.8 to 5.8 cal. ka BP, the sedimentological and palynological data suggest a predominant sediment supply from the inner part of the fjord, ice rafting, dense sea ice cover, strongly stratified water masses and high primary productivity. The interval from 4.4 to 3.8 cal. ka BP is marked by a layer of coarser material and a significant decrease in the grain-size mode. Our geochemical data show large-amplitude fluctuations after 2.0 cal. ka BP, while an increase in the dinocysts Impagidinium pallidum and Spiniferites elongatus from 2.0 to 1.2 cal. ka BP suggests enhanced Atlantic Water inflow. The dinocyst-based reconstructions also reveal large-amplitude millennial fluctuations in sea ice cover, summer sea-surface temperature and salinity. Wavelet analysis and cross-wavelet analysis on K/Ti ratio coupled with sea-ice estimates confirm a strong signal with a periodicity of 1200-1500 years. Article in Journal/Newspaper Isfjord* Isfjord* Isfjorden Isfjorden North Atlantic Sea ice Svalbard Spitsbergen Ghent University Academic Bibliography Svalbard Boreas 52 1 42 59 |
institution |
Open Polar |
collection |
Ghent University Academic Bibliography |
op_collection_id |
ftunivgent |
language |
English |
topic |
Earth and Environmental Sciences LAST GLACIAL MAXIMUM DINOFLAGELLATE CYSTS THERMOHALINE CIRCULATION SEDIMENTARY ENVIRONMENTS CLIMATE ICE SVALBARD MARINE WATER PALEOCEANOGRAPHY |
spellingShingle |
Earth and Environmental Sciences LAST GLACIAL MAXIMUM DINOFLAGELLATE CYSTS THERMOHALINE CIRCULATION SEDIMENTARY ENVIRONMENTS CLIMATE ICE SVALBARD MARINE WATER PALEOCEANOGRAPHY Brice, Camille de Vernal, Anne Francus, Pierre Forwick, Matthias Nam, Seung-Il Millennial-scale oscillations and an environmental regime shift around the Middle to Late Holocene transition in the North Atlantic region based on a multiproxy record from Isfjorden, West Spitsbergen |
topic_facet |
Earth and Environmental Sciences LAST GLACIAL MAXIMUM DINOFLAGELLATE CYSTS THERMOHALINE CIRCULATION SEDIMENTARY ENVIRONMENTS CLIMATE ICE SVALBARD MARINE WATER PALEOCEANOGRAPHY |
description |
Palynological and sedimentological analyses were performed on the sediment core HH16-1205-GC retrieved from the central Isfjorden, West Spitsbergen. The sequence, which spans the last 7000 years, revealed an overall cooling trend with an important climate shift between 4.4 and 3.8 cal. ka BP, in addition to millennial-scale oscillations. Sea-surface reconstruction from dinocyst assemblages indicates a decrease in summer sea-surface temperature, from 2.5 to 1.5 degrees C, and primary productivity, from 750 to 650 gC m(-2) a(-1) over the last 7000 years. From around 6.8 to 5.8 cal. ka BP, the sedimentological and palynological data suggest a predominant sediment supply from the inner part of the fjord, ice rafting, dense sea ice cover, strongly stratified water masses and high primary productivity. The interval from 4.4 to 3.8 cal. ka BP is marked by a layer of coarser material and a significant decrease in the grain-size mode. Our geochemical data show large-amplitude fluctuations after 2.0 cal. ka BP, while an increase in the dinocysts Impagidinium pallidum and Spiniferites elongatus from 2.0 to 1.2 cal. ka BP suggests enhanced Atlantic Water inflow. The dinocyst-based reconstructions also reveal large-amplitude millennial fluctuations in sea ice cover, summer sea-surface temperature and salinity. Wavelet analysis and cross-wavelet analysis on K/Ti ratio coupled with sea-ice estimates confirm a strong signal with a periodicity of 1200-1500 years. |
format |
Article in Journal/Newspaper |
author |
Brice, Camille de Vernal, Anne Francus, Pierre Forwick, Matthias Nam, Seung-Il |
author_facet |
Brice, Camille de Vernal, Anne Francus, Pierre Forwick, Matthias Nam, Seung-Il |
author_sort |
Brice, Camille |
title |
Millennial-scale oscillations and an environmental regime shift around the Middle to Late Holocene transition in the North Atlantic region based on a multiproxy record from Isfjorden, West Spitsbergen |
title_short |
Millennial-scale oscillations and an environmental regime shift around the Middle to Late Holocene transition in the North Atlantic region based on a multiproxy record from Isfjorden, West Spitsbergen |
title_full |
Millennial-scale oscillations and an environmental regime shift around the Middle to Late Holocene transition in the North Atlantic region based on a multiproxy record from Isfjorden, West Spitsbergen |
title_fullStr |
Millennial-scale oscillations and an environmental regime shift around the Middle to Late Holocene transition in the North Atlantic region based on a multiproxy record from Isfjorden, West Spitsbergen |
title_full_unstemmed |
Millennial-scale oscillations and an environmental regime shift around the Middle to Late Holocene transition in the North Atlantic region based on a multiproxy record from Isfjorden, West Spitsbergen |
title_sort |
millennial-scale oscillations and an environmental regime shift around the middle to late holocene transition in the north atlantic region based on a multiproxy record from isfjorden, west spitsbergen |
publishDate |
2022 |
url |
https://biblio.ugent.be/publication/8772371 http://hdl.handle.net/1854/LU-8772371 https://doi.org/10.1111/bor.12602 https://biblio.ugent.be/publication/8772371/file/8772372 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Isfjord* Isfjord* Isfjorden Isfjorden North Atlantic Sea ice Svalbard Spitsbergen |
genre_facet |
Isfjord* Isfjord* Isfjorden Isfjorden North Atlantic Sea ice Svalbard Spitsbergen |
op_source |
BOREAS ISSN: 0300-9483 ISSN: 1502-3885 |
op_relation |
https://biblio.ugent.be/publication/8772371 http://hdl.handle.net/1854/LU-8772371 http://dx.doi.org/10.1111/bor.12602 https://biblio.ugent.be/publication/8772371/file/8772372 |
op_rights |
Creative Commons Attribution-NonCommercial 4.0 International Public License (CC BY-NC 4.0) info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1111/bor.12602 |
container_title |
Boreas |
container_volume |
52 |
container_issue |
1 |
container_start_page |
42 |
op_container_end_page |
59 |
_version_ |
1768390201954009088 |