Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay
International audience Baffin Bay is a semi-enclosed basin connecting the Arctic Ocean and the western North Atlantic, thus making out a significant pathway for heat exchange. Here we reconstruct the alternating advection of relatively warmer and saline Atlantic waters versus the incursion of colder...
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Online Access: | https://hal.science/hal-02988524 https://hal.science/hal-02988524/document https://hal.science/hal-02988524/file/cp-16-1075-2020.pdf https://doi.org/10.5194/cp-16-1075-2020 |
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ftinsu:oai:HAL:hal-02988524v1 2023-06-18T03:38:40+02:00 Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay Hansen, Katrine Elnegaard Giraudeau, Jacques Wacker, Lukas Pearce, Christof Seidenkrantz, Marit-Solveig Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) 2020 https://hal.science/hal-02988524 https://hal.science/hal-02988524/document https://hal.science/hal-02988524/file/cp-16-1075-2020.pdf https://doi.org/10.5194/cp-16-1075-2020 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-16-1075-2020 hal-02988524 https://hal.science/hal-02988524 https://hal.science/hal-02988524/document https://hal.science/hal-02988524/file/cp-16-1075-2020.pdf doi:10.5194/cp-16-1075-2020 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-02988524 Climate of the Past, 2020, 16 (3), pp.1075-1095. ⟨10.5194/cp-16-1075-2020⟩ [SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2020 ftinsu https://doi.org/10.5194/cp-16-1075-2020 2023-06-05T21:51:19Z International audience Baffin Bay is a semi-enclosed basin connecting the Arctic Ocean and the western North Atlantic, thus making out a significant pathway for heat exchange. Here we reconstruct the alternating advection of relatively warmer and saline Atlantic waters versus the incursion of colder Arctic water masses entering Baffin Bay through the multiple gateways in the Canadian Arctic Archipelago and the Nares Strait during the Holocene. We carried out benthic foraminiferal assemblage analyses, X-ray fluorescence scanning, and radiocarbon dating of a 738 cm long marine sediment core retrieved from eastern Baffin Bay near Upernavik, Greenland (Core AMD14-204C; 987 m water depth). Results reveal that eastern Baffin Bay was subjected to several oceanographic changes during the last 9.2 kyr. Waning deglacial conditions with enhanced meltwater influxes and an extensive sea-ice cover prevailed in eastern Baffin Bay from 9.2 to 7.9 ka. A transition towards bottom water amelioration is recorded at 7.9 ka by increased advection of Atlantic water masses, encompassing the Holocene Thermal Maximum. A cold period with growing sea-ice cover at 6.7 ka interrupts the overall warm subsurface water conditions, promoted by a weaker northward flow of Atlantic waters. The onset of the neoglaciation at ca. 2.9 ka is marked by an abrupt transition towards a benthic fauna dominated by agglutinated species, likely in part explained by a reduction of the influx of Atlantic Water, allowing an increased influx of the cold, corrosive Baffin Bay Deep Water originating from the Arctic Ocean to enter Baffin Bay through the Nares Strait. These cold subsurface water conditions persisted throughout the Late Holocene, only interrupted by short-lived warmings superimposed on this cooling trend. Article in Journal/Newspaper Arctic Archipelago Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Canadian Arctic Archipelago Foraminifera* Greenland Nares strait North Atlantic Sea ice Upernavik Institut national des sciences de l'Univers: HAL-INSU Arctic Arctic Ocean Baffin Bay Canadian Arctic Archipelago Greenland Nares ENVELOPE(158.167,158.167,-81.450,-81.450) Climate of the Past 16 3 1075 1095 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] Hansen, Katrine Elnegaard Giraudeau, Jacques Wacker, Lukas Pearce, Christof Seidenkrantz, Marit-Solveig Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay |
topic_facet |
[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] |
description |
International audience Baffin Bay is a semi-enclosed basin connecting the Arctic Ocean and the western North Atlantic, thus making out a significant pathway for heat exchange. Here we reconstruct the alternating advection of relatively warmer and saline Atlantic waters versus the incursion of colder Arctic water masses entering Baffin Bay through the multiple gateways in the Canadian Arctic Archipelago and the Nares Strait during the Holocene. We carried out benthic foraminiferal assemblage analyses, X-ray fluorescence scanning, and radiocarbon dating of a 738 cm long marine sediment core retrieved from eastern Baffin Bay near Upernavik, Greenland (Core AMD14-204C; 987 m water depth). Results reveal that eastern Baffin Bay was subjected to several oceanographic changes during the last 9.2 kyr. Waning deglacial conditions with enhanced meltwater influxes and an extensive sea-ice cover prevailed in eastern Baffin Bay from 9.2 to 7.9 ka. A transition towards bottom water amelioration is recorded at 7.9 ka by increased advection of Atlantic water masses, encompassing the Holocene Thermal Maximum. A cold period with growing sea-ice cover at 6.7 ka interrupts the overall warm subsurface water conditions, promoted by a weaker northward flow of Atlantic waters. The onset of the neoglaciation at ca. 2.9 ka is marked by an abrupt transition towards a benthic fauna dominated by agglutinated species, likely in part explained by a reduction of the influx of Atlantic Water, allowing an increased influx of the cold, corrosive Baffin Bay Deep Water originating from the Arctic Ocean to enter Baffin Bay through the Nares Strait. These cold subsurface water conditions persisted throughout the Late Holocene, only interrupted by short-lived warmings superimposed on this cooling trend. |
author2 |
Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Hansen, Katrine Elnegaard Giraudeau, Jacques Wacker, Lukas Pearce, Christof Seidenkrantz, Marit-Solveig |
author_facet |
Hansen, Katrine Elnegaard Giraudeau, Jacques Wacker, Lukas Pearce, Christof Seidenkrantz, Marit-Solveig |
author_sort |
Hansen, Katrine Elnegaard |
title |
Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay |
title_short |
Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay |
title_full |
Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay |
title_fullStr |
Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay |
title_full_unstemmed |
Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay |
title_sort |
reconstruction of holocene oceanographic conditions in eastern baffin bay |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-02988524 https://hal.science/hal-02988524/document https://hal.science/hal-02988524/file/cp-16-1075-2020.pdf https://doi.org/10.5194/cp-16-1075-2020 |
long_lat |
ENVELOPE(158.167,158.167,-81.450,-81.450) |
geographic |
Arctic Arctic Ocean Baffin Bay Canadian Arctic Archipelago Greenland Nares |
geographic_facet |
Arctic Arctic Ocean Baffin Bay Canadian Arctic Archipelago Greenland Nares |
genre |
Arctic Archipelago Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Canadian Arctic Archipelago Foraminifera* Greenland Nares strait North Atlantic Sea ice Upernavik |
genre_facet |
Arctic Archipelago Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Canadian Arctic Archipelago Foraminifera* Greenland Nares strait North Atlantic Sea ice Upernavik |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-02988524 Climate of the Past, 2020, 16 (3), pp.1075-1095. ⟨10.5194/cp-16-1075-2020⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-16-1075-2020 hal-02988524 https://hal.science/hal-02988524 https://hal.science/hal-02988524/document https://hal.science/hal-02988524/file/cp-16-1075-2020.pdf doi:10.5194/cp-16-1075-2020 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-16-1075-2020 |
container_title |
Climate of the Past |
container_volume |
16 |
container_issue |
3 |
container_start_page |
1075 |
op_container_end_page |
1095 |
_version_ |
1769003564575752192 |