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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fttriple:oai:gotriple.eu:10670/1.kk1g99 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 Marit-Solveig, Seidenkrantz EPOC - CNRS, UMR 5805 2020-01-01 https://doi.org/10.5194/cp-16-1075-2020 https://hal.archives-ouvertes.fr/hal-02991681/file/cp-16-1075-2020-1.pdf https://hal.archives-ouvertes.fr/hal-02991681 en eng HAL CCSD European Geosciences Union (EGU) hal-02991681 doi:10.5194/cp-16-1075-2020 10670/1.kk1g99 https://hal.archives-ouvertes.fr/hal-02991681/file/cp-16-1075-2020-1.pdf https://hal.archives-ouvertes.fr/hal-02991681 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, 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 2023-01-22T17:27:06Z 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 ra-diocarbon dating of a 738 cm long marine sediment core retrieved from eastern Baffin Bay near Upernavik, Green-land (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* Nares strait North Atlantic Sea ice Upernavik Unknown Arctic Arctic Ocean Baffin Bay Canadian Arctic Archipelago Nares ENVELOPE(158.167,158.167,-81.450,-81.450) Climate of the Past 16 3 1075 1095 |
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Open Polar |
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language |
English |
topic |
envir geo |
spellingShingle |
envir geo Hansen, Katrine Elnegaard Giraudeau, Jacques Wacker, Lukas Pearce, Christof Marit-Solveig, Seidenkrantz 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 ra-diocarbon dating of a 738 cm long marine sediment core retrieved from eastern Baffin Bay near Upernavik, Green-land (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 |
EPOC - CNRS, UMR 5805 |
format |
Article in Journal/Newspaper |
author |
Hansen, Katrine Elnegaard Giraudeau, Jacques Wacker, Lukas Pearce, Christof Marit-Solveig, Seidenkrantz |
author_facet |
Hansen, Katrine Elnegaard Giraudeau, Jacques Wacker, Lukas Pearce, Christof Marit-Solveig, Seidenkrantz |
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-02991681/file/cp-16-1075-2020-1.pdf https://hal.archives-ouvertes.fr/hal-02991681 |
long_lat |
ENVELOPE(158.167,158.167,-81.450,-81.450) |
geographic |
Arctic Arctic Ocean Baffin Bay Canadian Arctic Archipelago Nares |
geographic_facet |
Arctic Arctic Ocean Baffin Bay Canadian Arctic Archipelago Nares |
genre |
Arctic Archipelago Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Canadian Arctic Archipelago Foraminifera* Nares strait North Atlantic Sea ice Upernavik |
genre_facet |
Arctic Archipelago Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Canadian Arctic Archipelago Foraminifera* 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, pp.1075 - 1095. ⟨10.5194/cp-16-1075-2020⟩ |
op_relation |
hal-02991681 doi:10.5194/cp-16-1075-2020 10670/1.kk1g99 https://hal.archives-ouvertes.fr/hal-02991681/file/cp-16-1075-2020-1.pdf https://hal.archives-ouvertes.fr/hal-02991681 |
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_ |
1766303066134413312 |