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...
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2020
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ftdoajarticles:oai:doaj.org/article:5d369826332e484a81c3582eb81b36f0 2023-05-15T14:28:57+02:00 Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay K. E. Hansen J. Giraudeau L. Wacker C. Pearce M.-S. Seidenkrantz 2020-06-01T00:00:00Z https://doi.org/10.5194/cp-16-1075-2020 https://doaj.org/article/5d369826332e484a81c3582eb81b36f0 EN eng Copernicus Publications https://cp.copernicus.org/articles/16/1075/2020/cp-16-1075-2020.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-16-1075-2020 1814-9324 1814-9332 https://doaj.org/article/5d369826332e484a81c3582eb81b36f0 Climate of the Past, Vol 16, Pp 1075-1095 (2020) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2020 ftdoajarticles https://doi.org/10.5194/cp-16-1075-2020 2022-12-31T06:10:03Z 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 Directory of Open Access Journals: DOAJ Articles 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 |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 K. E. Hansen J. Giraudeau L. Wacker C. Pearce M.-S. Seidenkrantz Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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 |
K. E. Hansen J. Giraudeau L. Wacker C. Pearce M.-S. Seidenkrantz |
author_facet |
K. E. Hansen J. Giraudeau L. Wacker C. Pearce M.-S. Seidenkrantz |
author_sort |
K. E. Hansen |
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 |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/cp-16-1075-2020 https://doaj.org/article/5d369826332e484a81c3582eb81b36f0 |
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 |
Climate of the Past, Vol 16, Pp 1075-1095 (2020) |
op_relation |
https://cp.copernicus.org/articles/16/1075/2020/cp-16-1075-2020.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-16-1075-2020 1814-9324 1814-9332 https://doaj.org/article/5d369826332e484a81c3582eb81b36f0 |
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_ |
1766303072324157440 |