Holocene palaeoceanography of the Northeast Greenland shelf
The Northeast Greenland shelf is highly sensitive to climate and ocean variability because it is swept by the East Greenland Current, which, through the western Fram Strait, forms the main pathway of export of sea ice and cold water masses from the Arctic Ocean into the North Atlantic Ocean. In orde...
Published in: | Climate of the Past |
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Copernicus Publications
2022
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00059957 2024-09-15T17:54:12+00:00 Holocene palaeoceanography of the Northeast Greenland shelf Pados-Dibattista, Teodora Pearce, Christof Detlef, Henrieka Bendtsen, Jørgen Seidenkrantz, Marit-Solveig 2022-01 electronic https://doi.org/10.5194/cp-18-103-2022 https://noa.gwlb.de/receive/cop_mods_00059957 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00059606/cp-18-103-2022.pdf https://cp.copernicus.org/articles/18/103/2022/cp-18-103-2022.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-18-103-2022 https://noa.gwlb.de/receive/cop_mods_00059957 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00059606/cp-18-103-2022.pdf https://cp.copernicus.org/articles/18/103/2022/cp-18-103-2022.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/cp-18-103-2022 2024-06-26T04:34:57Z The Northeast Greenland shelf is highly sensitive to climate and ocean variability because it is swept by the East Greenland Current, which, through the western Fram Strait, forms the main pathway of export of sea ice and cold water masses from the Arctic Ocean into the North Atlantic Ocean. In order to reconstruct the variability of the East Greenland Current and general palaeoceanographic conditions in the area during the Holocene, we carried out benthic foraminiferal assemblage, stable isotope, and sedimentological analyses of a marine sediment core retrieved from the Northeast Greenland shelf (core DA17-NG-ST07-73G). The results reveal significant variations in the water masses and thus in the strength of the East Greenland Current over the last ca. 9.4 kyr. Between 9.4 and 8.2 ka the water column off Northeast Greenland was highly stratified, with cold, sea-ice-loaded surface waters and a strong influx of warm Atlantic Water in the subsurface. At ∼ 8.4 ka a short-lived peak in terrestrial elements may be linked to an influx of iceberg-transported sediments and thus to the so-called 8.2 ka event. Conditions similar to those of the Holocene Thermal Maximum prevailed from 8.2 to 6.2 ka, with a strong influence of the Return Atlantic Current and a weakened transport of Polar Water in the upper East Greenland Current. After 6.2 ka we recorded a return to a more stratified water column with sea-ice-loaded surface waters and still Atlantic-sourced subsurface waters. After 4.2 ka increased Polar Water at the surface of the East Greenland Current and a reduction in the Return Atlantic Water at subsurface levels signifies freshening and reduced stratification of the water column and (near) perennial sea-ice cover. The neoglaciation started at 3.2 ka at our location, characterized by a strengthened East Greenland Current. Cold subsurface-water conditions with possible sea-ice cover and minimum surface-water productivity persisted here throughout the last ∼ 3 kyr. Article in Journal/Newspaper Arctic Ocean East Greenland east greenland current Foraminifera* Fram Strait Greenland Iceberg* North Atlantic Sea ice Niedersächsisches Online-Archiv NOA Climate of the Past 18 1 103 127 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Pados-Dibattista, Teodora Pearce, Christof Detlef, Henrieka Bendtsen, Jørgen Seidenkrantz, Marit-Solveig Holocene palaeoceanography of the Northeast Greenland shelf |
topic_facet |
article Verlagsveröffentlichung |
description |
The Northeast Greenland shelf is highly sensitive to climate and ocean variability because it is swept by the East Greenland Current, which, through the western Fram Strait, forms the main pathway of export of sea ice and cold water masses from the Arctic Ocean into the North Atlantic Ocean. In order to reconstruct the variability of the East Greenland Current and general palaeoceanographic conditions in the area during the Holocene, we carried out benthic foraminiferal assemblage, stable isotope, and sedimentological analyses of a marine sediment core retrieved from the Northeast Greenland shelf (core DA17-NG-ST07-73G). The results reveal significant variations in the water masses and thus in the strength of the East Greenland Current over the last ca. 9.4 kyr. Between 9.4 and 8.2 ka the water column off Northeast Greenland was highly stratified, with cold, sea-ice-loaded surface waters and a strong influx of warm Atlantic Water in the subsurface. At ∼ 8.4 ka a short-lived peak in terrestrial elements may be linked to an influx of iceberg-transported sediments and thus to the so-called 8.2 ka event. Conditions similar to those of the Holocene Thermal Maximum prevailed from 8.2 to 6.2 ka, with a strong influence of the Return Atlantic Current and a weakened transport of Polar Water in the upper East Greenland Current. After 6.2 ka we recorded a return to a more stratified water column with sea-ice-loaded surface waters and still Atlantic-sourced subsurface waters. After 4.2 ka increased Polar Water at the surface of the East Greenland Current and a reduction in the Return Atlantic Water at subsurface levels signifies freshening and reduced stratification of the water column and (near) perennial sea-ice cover. The neoglaciation started at 3.2 ka at our location, characterized by a strengthened East Greenland Current. Cold subsurface-water conditions with possible sea-ice cover and minimum surface-water productivity persisted here throughout the last ∼ 3 kyr. |
format |
Article in Journal/Newspaper |
author |
Pados-Dibattista, Teodora Pearce, Christof Detlef, Henrieka Bendtsen, Jørgen Seidenkrantz, Marit-Solveig |
author_facet |
Pados-Dibattista, Teodora Pearce, Christof Detlef, Henrieka Bendtsen, Jørgen Seidenkrantz, Marit-Solveig |
author_sort |
Pados-Dibattista, Teodora |
title |
Holocene palaeoceanography of the Northeast Greenland shelf |
title_short |
Holocene palaeoceanography of the Northeast Greenland shelf |
title_full |
Holocene palaeoceanography of the Northeast Greenland shelf |
title_fullStr |
Holocene palaeoceanography of the Northeast Greenland shelf |
title_full_unstemmed |
Holocene palaeoceanography of the Northeast Greenland shelf |
title_sort |
holocene palaeoceanography of the northeast greenland shelf |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/cp-18-103-2022 https://noa.gwlb.de/receive/cop_mods_00059957 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00059606/cp-18-103-2022.pdf https://cp.copernicus.org/articles/18/103/2022/cp-18-103-2022.pdf |
genre |
Arctic Ocean East Greenland east greenland current Foraminifera* Fram Strait Greenland Iceberg* North Atlantic Sea ice |
genre_facet |
Arctic Ocean East Greenland east greenland current Foraminifera* Fram Strait Greenland Iceberg* North Atlantic Sea ice |
op_relation |
Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-18-103-2022 https://noa.gwlb.de/receive/cop_mods_00059957 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00059606/cp-18-103-2022.pdf https://cp.copernicus.org/articles/18/103/2022/cp-18-103-2022.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-18-103-2022 |
container_title |
Climate of the Past |
container_volume |
18 |
container_issue |
1 |
container_start_page |
103 |
op_container_end_page |
127 |
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1810430447494103040 |