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://doi.org/10.5194/cp-16-1075-2020 https://hal.archives-ouvertes.fr/hal-02988524/file/cp-16-1075-2020.pdf https://hal.archives-ouvertes.fr/hal-02988524 |
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fttriple:oai:gotriple.eu:10670/1.6lbuhz 2023-05-15T14:28:57+02:00 Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay Hansen, Katrine Elnegaard Giraudeau, Jacques Wacker, Lukas Pearce, Christof Seidenkrantz, Marit-Solveig UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-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) 2020-01-01 https://doi.org/10.5194/cp-16-1075-2020 https://hal.archives-ouvertes.fr/hal-02988524/file/cp-16-1075-2020.pdf https://hal.archives-ouvertes.fr/hal-02988524 en eng HAL CCSD European Geosciences Union (EGU) hal-02988524 doi:10.5194/cp-16-1075-2020 10670/1.6lbuhz https://hal.archives-ouvertes.fr/hal-02988524/file/cp-16-1075-2020.pdf https://hal.archives-ouvertes.fr/hal-02988524 lic_creative-commons other Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past Climate of the Past, European Geosciences Union (EGU), 2020, 16 (3), pp.1075-1095. ⟨10.5194/cp-16-1075-2020⟩ envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2020 fttriple https://doi.org/10.5194/cp-16-1075-2020 2023-01-22T18:34:06Z 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 Unknown 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 |
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Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
envir geo |
spellingShingle |
envir geo Hansen, Katrine Elnegaard Giraudeau, Jacques Wacker, Lukas Pearce, Christof Seidenkrantz, Marit-Solveig Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay |
topic_facet |
envir geo |
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 |
UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-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://doi.org/10.5194/cp-16-1075-2020 https://hal.archives-ouvertes.fr/hal-02988524/file/cp-16-1075-2020.pdf https://hal.archives-ouvertes.fr/hal-02988524 |
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 |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past Climate of the Past, European Geosciences Union (EGU), 2020, 16 (3), pp.1075-1095. ⟨10.5194/cp-16-1075-2020⟩ |
op_relation |
hal-02988524 doi:10.5194/cp-16-1075-2020 10670/1.6lbuhz https://hal.archives-ouvertes.fr/hal-02988524/file/cp-16-1075-2020.pdf https://hal.archives-ouvertes.fr/hal-02988524 |
op_rights |
lic_creative-commons other |
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 |
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1766303066664992768 |