Water mass exchange between the Nordic Seas and the Arctic Ocean on millennial time scale during MIS 4–2
The climate of the last glaciation circa 65,000–25,000 years ago was interrupted by about 15 abrupt temperature fluctuations, the so-called Dansgaard-Oeschger events consisting of warm interstadials and cold stadials recorded in Greenland ice cores. The largest fluctuations occur in the North Atlant...
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American Geophysical Union
2014
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Online Access: | https://hdl.handle.net/10037/12110 https://doi.org/10.1002/2013GC005020 |
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ftunivtroemsoe:oai:munin.uit.no:10037/12110 2023-05-15T14:23:03+02:00 Water mass exchange between the Nordic Seas and the Arctic Ocean on millennial time scale during MIS 4–2 Rasmussen, Tine Lander Thomsen, Erik Nielsen, Tove 2014 https://hdl.handle.net/10037/12110 https://doi.org/10.1002/2013GC005020 eng eng American Geophysical Union Geochemistry Geophysics Geosystems info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE Rasmussen, T.L.R., Thomsen, E., Nielsen, T. Water mass exchange between the Nordic Seas and the Arctic Ocean on millennial time scale during MIS 4–2. Geochemistry Geophysics Geosystems. 2014;15:530-544 FRIDAID 1097485 doi:10.1002/2013GC005020 1525-2027 https://hdl.handle.net/10037/12110 openAccess VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Journal article Tidsskriftartikkel Peer reviewed 2014 ftunivtroemsoe https://doi.org/10.1002/2013GC005020 2021-06-25T17:55:48Z The climate of the last glaciation circa 65,000–25,000 years ago was interrupted by about 15 abrupt temperature fluctuations, the so-called Dansgaard-Oeschger events consisting of warm interstadials and cold stadials recorded in Greenland ice cores. The largest fluctuations occur in the North Atlantic region, but they have been registered over the most of the world. The events are linked to changes in deep water formation in the Nordic seas and North Atlantic, disrupting the thermo haline circulation. Yet, Dansgaard-Oeschger events have so far not been recorded north of the convection areas in the central Nordic seas, and it is not known if they affected the water exchange between the Nordic seas and the Arctic Ocean. In this study, we analyze core JM05-31GC from the northern Fram Strait at the very entrance to the Arctic Ocean. The core contains sediments from marine isotope stages (MISs) 4–2. The results show millennial timescale shifts in all the investigated proxies including the distribution of planktonic and benthic foraminifera, planktonic and benthic oxygen and carbon isotopes, and several sedimentological parameters. In JM05-31GC, the interstadials are characterized by relatively high surface and low bottom water temperatures, low content of ice-rafted debris, and well-ventilated bottom water. Stadials are characterized by the presence of icebergs and decreasing surface water and increasing bottom water temperatures due to increased inflow of Atlantic subsurface water. Ventilation decreased during Heinrich events and mo st stadials. The results show that the Dansgaard- Oeschger events strongly affected the water exchange between the Nordic seas and the Arctic Ocean. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Dansgaard-Oeschger events Foraminifera* Fram Strait Greenland Greenland ice cores Iceberg* Nordic Seas North Atlantic University of Tromsø: Munin Open Research Archive Arctic Arctic Ocean Greenland Geochemistry, Geophysics, Geosystems 15 3 530 544 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Rasmussen, Tine Lander Thomsen, Erik Nielsen, Tove Water mass exchange between the Nordic Seas and the Arctic Ocean on millennial time scale during MIS 4–2 |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
description |
The climate of the last glaciation circa 65,000–25,000 years ago was interrupted by about 15 abrupt temperature fluctuations, the so-called Dansgaard-Oeschger events consisting of warm interstadials and cold stadials recorded in Greenland ice cores. The largest fluctuations occur in the North Atlantic region, but they have been registered over the most of the world. The events are linked to changes in deep water formation in the Nordic seas and North Atlantic, disrupting the thermo haline circulation. Yet, Dansgaard-Oeschger events have so far not been recorded north of the convection areas in the central Nordic seas, and it is not known if they affected the water exchange between the Nordic seas and the Arctic Ocean. In this study, we analyze core JM05-31GC from the northern Fram Strait at the very entrance to the Arctic Ocean. The core contains sediments from marine isotope stages (MISs) 4–2. The results show millennial timescale shifts in all the investigated proxies including the distribution of planktonic and benthic foraminifera, planktonic and benthic oxygen and carbon isotopes, and several sedimentological parameters. In JM05-31GC, the interstadials are characterized by relatively high surface and low bottom water temperatures, low content of ice-rafted debris, and well-ventilated bottom water. Stadials are characterized by the presence of icebergs and decreasing surface water and increasing bottom water temperatures due to increased inflow of Atlantic subsurface water. Ventilation decreased during Heinrich events and mo st stadials. The results show that the Dansgaard- Oeschger events strongly affected the water exchange between the Nordic seas and the Arctic Ocean. |
format |
Article in Journal/Newspaper |
author |
Rasmussen, Tine Lander Thomsen, Erik Nielsen, Tove |
author_facet |
Rasmussen, Tine Lander Thomsen, Erik Nielsen, Tove |
author_sort |
Rasmussen, Tine Lander |
title |
Water mass exchange between the Nordic Seas and the Arctic Ocean on millennial time scale during MIS 4–2 |
title_short |
Water mass exchange between the Nordic Seas and the Arctic Ocean on millennial time scale during MIS 4–2 |
title_full |
Water mass exchange between the Nordic Seas and the Arctic Ocean on millennial time scale during MIS 4–2 |
title_fullStr |
Water mass exchange between the Nordic Seas and the Arctic Ocean on millennial time scale during MIS 4–2 |
title_full_unstemmed |
Water mass exchange between the Nordic Seas and the Arctic Ocean on millennial time scale during MIS 4–2 |
title_sort |
water mass exchange between the nordic seas and the arctic ocean on millennial time scale during mis 4–2 |
publisher |
American Geophysical Union |
publishDate |
2014 |
url |
https://hdl.handle.net/10037/12110 https://doi.org/10.1002/2013GC005020 |
geographic |
Arctic Arctic Ocean Greenland |
geographic_facet |
Arctic Arctic Ocean Greenland |
genre |
Arctic Arctic Arctic Ocean Dansgaard-Oeschger events Foraminifera* Fram Strait Greenland Greenland ice cores Iceberg* Nordic Seas North Atlantic |
genre_facet |
Arctic Arctic Arctic Ocean Dansgaard-Oeschger events Foraminifera* Fram Strait Greenland Greenland ice cores Iceberg* Nordic Seas North Atlantic |
op_relation |
Geochemistry Geophysics Geosystems info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE Rasmussen, T.L.R., Thomsen, E., Nielsen, T. Water mass exchange between the Nordic Seas and the Arctic Ocean on millennial time scale during MIS 4–2. Geochemistry Geophysics Geosystems. 2014;15:530-544 FRIDAID 1097485 doi:10.1002/2013GC005020 1525-2027 https://hdl.handle.net/10037/12110 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1002/2013GC005020 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
15 |
container_issue |
3 |
container_start_page |
530 |
op_container_end_page |
544 |
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1766295529379069952 |