Abrupt shifts of productivity and sea ice regimes at the western Barents Sea slope from the Last Glacial Maximum to the Bølling-Allerød interstadial
Advanced knowledge of spatio-temporal constraints on the Barents Sea Ice Sheet during the late Weichselian glaciation overshadows relatively limited understanding of seasonal sea ice (experiencing an annual advance-retreat cycle) and primary productivity trends accompanying massive, abrupt climate c...
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Online Access: | https://archimer.ifremer.fr/doc/00514/62532/86740.pdf https://doi.org/10.1016/j.quascirev.2019.105903 https://archimer.ifremer.fr/doc/00514/62532/ |
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ftarchimer:oai:archimer.ifremer.fr:62532 2023-05-15T15:12:37+02:00 Abrupt shifts of productivity and sea ice regimes at the western Barents Sea slope from the Last Glacial Maximum to the Bølling-Allerød interstadial Köseoğlu, Denizcan Belt, Simon T. Knies, Jochen 2019-10 application/pdf https://archimer.ifremer.fr/doc/00514/62532/86740.pdf https://doi.org/10.1016/j.quascirev.2019.105903 https://archimer.ifremer.fr/doc/00514/62532/ eng eng Elsevier BV https://archimer.ifremer.fr/doc/00514/62532/86740.pdf doi:10.1016/j.quascirev.2019.105903 https://archimer.ifremer.fr/doc/00514/62532/ info:eu-repo/semantics/openAccess restricted use Quaternary Science Reviews (0277-3791) (Elsevier BV), 2019-10 , Vol. 222 , P. 105903 (17p.) Arctic Ocean Quaternary Sea ice Marine biomarkers HBI IP25 PIP25 Barents Sea Coastal polynya Classification tree text Publication info:eu-repo/semantics/article 2019 ftarchimer https://doi.org/10.1016/j.quascirev.2019.105903 2021-09-23T20:33:28Z Advanced knowledge of spatio-temporal constraints on the Barents Sea Ice Sheet during the late Weichselian glaciation overshadows relatively limited understanding of seasonal sea ice (experiencing an annual advance-retreat cycle) and primary productivity trends accompanying massive, abrupt climate changes during glacial-deglacial cycles. Such paleo-reconstructions are crucial prerequisites for improved comprehension and prediction of current and future climate change. Here, we investigate sea ice and phytoplankton biomarker distributions in a Barents Sea sediment core covering ca. 25.8–15.4 cal kyr BP to elucidate abrupt shifts of spring–summer sea ice concentrations and relative sympagic–pelagic productivity trends at the southwestern continental slope. Despite significant presence of seasonal sea ice, the Last Glacial Maximum (LGM) and initial shelf edge deglaciation (SEDG) at the core site are characterised by occurrence of productive coastal polynya adjacent to the maximum ice sheet extent. The onset of perennial (i.e. multi-year) ice cover and near-zero productivity during Heinrich Stadial 1 (HS1; ca. 18.0–16.3 cal kyr BP) accompanies significant meltwater fluxes from ice sheet debuttressing and the consequent stagnation of thermohaline circulation. Rapid sea ice retreat and unprecedented pelagic productivity observed after 16.3 cal kyr BP coincides with areal ice sheet deglaciation and is potentially linked to the release of sub-surface heat and nutrient reservoirs, together with reinvigorated deep water circulation following millennial heating of the deep ocean during HS1. We find that a multivariate fingerprinting approach involving assessment of both downcore and surface biomarker distributions is able to distinguish relative ice-algal and pelagic diatom productivity driven by sea ice dynamics. Article in Journal/Newspaper Arctic Arctic Ocean Barents Sea Climate change Ice Sheet Phytoplankton Sea ice Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Arctic Arctic Ocean Barents Sea Quaternary Science Reviews 222 105903 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Arctic Ocean Quaternary Sea ice Marine biomarkers HBI IP25 PIP25 Barents Sea Coastal polynya Classification tree |
spellingShingle |
Arctic Ocean Quaternary Sea ice Marine biomarkers HBI IP25 PIP25 Barents Sea Coastal polynya Classification tree Köseoğlu, Denizcan Belt, Simon T. Knies, Jochen Abrupt shifts of productivity and sea ice regimes at the western Barents Sea slope from the Last Glacial Maximum to the Bølling-Allerød interstadial |
topic_facet |
Arctic Ocean Quaternary Sea ice Marine biomarkers HBI IP25 PIP25 Barents Sea Coastal polynya Classification tree |
description |
Advanced knowledge of spatio-temporal constraints on the Barents Sea Ice Sheet during the late Weichselian glaciation overshadows relatively limited understanding of seasonal sea ice (experiencing an annual advance-retreat cycle) and primary productivity trends accompanying massive, abrupt climate changes during glacial-deglacial cycles. Such paleo-reconstructions are crucial prerequisites for improved comprehension and prediction of current and future climate change. Here, we investigate sea ice and phytoplankton biomarker distributions in a Barents Sea sediment core covering ca. 25.8–15.4 cal kyr BP to elucidate abrupt shifts of spring–summer sea ice concentrations and relative sympagic–pelagic productivity trends at the southwestern continental slope. Despite significant presence of seasonal sea ice, the Last Glacial Maximum (LGM) and initial shelf edge deglaciation (SEDG) at the core site are characterised by occurrence of productive coastal polynya adjacent to the maximum ice sheet extent. The onset of perennial (i.e. multi-year) ice cover and near-zero productivity during Heinrich Stadial 1 (HS1; ca. 18.0–16.3 cal kyr BP) accompanies significant meltwater fluxes from ice sheet debuttressing and the consequent stagnation of thermohaline circulation. Rapid sea ice retreat and unprecedented pelagic productivity observed after 16.3 cal kyr BP coincides with areal ice sheet deglaciation and is potentially linked to the release of sub-surface heat and nutrient reservoirs, together with reinvigorated deep water circulation following millennial heating of the deep ocean during HS1. We find that a multivariate fingerprinting approach involving assessment of both downcore and surface biomarker distributions is able to distinguish relative ice-algal and pelagic diatom productivity driven by sea ice dynamics. |
format |
Article in Journal/Newspaper |
author |
Köseoğlu, Denizcan Belt, Simon T. Knies, Jochen |
author_facet |
Köseoğlu, Denizcan Belt, Simon T. Knies, Jochen |
author_sort |
Köseoğlu, Denizcan |
title |
Abrupt shifts of productivity and sea ice regimes at the western Barents Sea slope from the Last Glacial Maximum to the Bølling-Allerød interstadial |
title_short |
Abrupt shifts of productivity and sea ice regimes at the western Barents Sea slope from the Last Glacial Maximum to the Bølling-Allerød interstadial |
title_full |
Abrupt shifts of productivity and sea ice regimes at the western Barents Sea slope from the Last Glacial Maximum to the Bølling-Allerød interstadial |
title_fullStr |
Abrupt shifts of productivity and sea ice regimes at the western Barents Sea slope from the Last Glacial Maximum to the Bølling-Allerød interstadial |
title_full_unstemmed |
Abrupt shifts of productivity and sea ice regimes at the western Barents Sea slope from the Last Glacial Maximum to the Bølling-Allerød interstadial |
title_sort |
abrupt shifts of productivity and sea ice regimes at the western barents sea slope from the last glacial maximum to the bølling-allerød interstadial |
publisher |
Elsevier BV |
publishDate |
2019 |
url |
https://archimer.ifremer.fr/doc/00514/62532/86740.pdf https://doi.org/10.1016/j.quascirev.2019.105903 https://archimer.ifremer.fr/doc/00514/62532/ |
geographic |
Arctic Arctic Ocean Barents Sea |
geographic_facet |
Arctic Arctic Ocean Barents Sea |
genre |
Arctic Arctic Ocean Barents Sea Climate change Ice Sheet Phytoplankton Sea ice |
genre_facet |
Arctic Arctic Ocean Barents Sea Climate change Ice Sheet Phytoplankton Sea ice |
op_source |
Quaternary Science Reviews (0277-3791) (Elsevier BV), 2019-10 , Vol. 222 , P. 105903 (17p.) |
op_relation |
https://archimer.ifremer.fr/doc/00514/62532/86740.pdf doi:10.1016/j.quascirev.2019.105903 https://archimer.ifremer.fr/doc/00514/62532/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.quascirev.2019.105903 |
container_title |
Quaternary Science Reviews |
container_volume |
222 |
container_start_page |
105903 |
_version_ |
1766343273789521920 |