Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay
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 en...
Published in: | Climate of the Past |
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Language: | English |
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2020
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Online Access: | https://pure.au.dk/portal/da/publications/reconstruction-of-holocene-oceanographic-conditions-in-eastern-baffin-bay(212f0fce-f162-46b6-9770-dc42fc15b39d).html https://doi.org/10.5194/cp-16-1075-2020 http://www.scopus.com/inward/record.url?scp=85087855976&partnerID=8YFLogxK |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/212f0fce-f162-46b6-9770-dc42fc15b39d 2023-05-15T14:28:56+02:00 Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay Hansen, Katrine Elnegaard Giraudeau, Jacques Wacker, Lukas Pearce, Christof Seidenkrantz, Marit Solveig 2020-06-22 https://pure.au.dk/portal/da/publications/reconstruction-of-holocene-oceanographic-conditions-in-eastern-baffin-bay(212f0fce-f162-46b6-9770-dc42fc15b39d).html https://doi.org/10.5194/cp-16-1075-2020 http://www.scopus.com/inward/record.url?scp=85087855976&partnerID=8YFLogxK eng eng info:eu-repo/semantics/openAccess Hansen , K E , Giraudeau , J , Wacker , L , Pearce , C & Seidenkrantz , M S 2020 , ' Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay ' , Climate of the Past , vol. 16 , no. 3 , pp. 1075-1095 . https://doi.org/10.5194/cp-16-1075-2020 article 2020 ftuniaarhuspubl https://doi.org/10.5194/cp-16-1075-2020 2020-08-19T22:45:09Z 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 Aarhus University: Research 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 |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Hansen, Katrine Elnegaard Giraudeau, Jacques Wacker, Lukas Pearce, Christof Seidenkrantz, Marit Solveig |
spellingShingle |
Hansen, Katrine Elnegaard Giraudeau, Jacques Wacker, Lukas Pearce, Christof Seidenkrantz, Marit Solveig Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay |
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 |
publishDate |
2020 |
url |
https://pure.au.dk/portal/da/publications/reconstruction-of-holocene-oceanographic-conditions-in-eastern-baffin-bay(212f0fce-f162-46b6-9770-dc42fc15b39d).html https://doi.org/10.5194/cp-16-1075-2020 http://www.scopus.com/inward/record.url?scp=85087855976&partnerID=8YFLogxK |
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 |
Hansen , K E , Giraudeau , J , Wacker , L , Pearce , C & Seidenkrantz , M S 2020 , ' Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay ' , Climate of the Past , vol. 16 , no. 3 , pp. 1075-1095 . https://doi.org/10.5194/cp-16-1075-2020 |
op_rights |
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_ |
1766303060757315584 |