Dansgaard-Oeschger cycles: Interactions between ocean and sea ice intrinsic to the Nordic seas
International audience Dansgaard-Oeschger (D-O) cycles are the most dramatic, frequent, and wide-reaching abrupt climate changes in the geologic record. On Greenland, DO cycles are characterized by an abrupt warming of 10 ± 5°C from a cold stadial to a warm interstadial phase, followed by gradual co...
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Online Access: | https://hal.archives-ouvertes.fr/hal-03118206 https://hal.archives-ouvertes.fr/hal-03118206/document https://hal.archives-ouvertes.fr/hal-03118206/file/palo.20042.pdf https://doi.org/10.1002/palo.20042 |
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ftccsdartic:oai:HAL:hal-03118206v1 2023-05-15T16:13:03+02:00 Dansgaard-Oeschger cycles: Interactions between ocean and sea ice intrinsic to the Nordic seas Dokken, Trond Nisancioglu, Kerim Li, Camille Battisti, David Kissel, Catherine Bjerknes Centre for Climate Research (BCCR) Department of Biological Sciences Bergen (BIO / UiB) University of Bergen (UiB)-University of Bergen (UiB) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Climat et Magnétisme (CLIMAG) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) 2013 https://hal.archives-ouvertes.fr/hal-03118206 https://hal.archives-ouvertes.fr/hal-03118206/document https://hal.archives-ouvertes.fr/hal-03118206/file/palo.20042.pdf https://doi.org/10.1002/palo.20042 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/palo.20042 hal-03118206 https://hal.archives-ouvertes.fr/hal-03118206 https://hal.archives-ouvertes.fr/hal-03118206/document https://hal.archives-ouvertes.fr/hal-03118206/file/palo.20042.pdf doi:10.1002/palo.20042 info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.archives-ouvertes.fr/hal-03118206 Paleoceanography, American Geophysical Union, 2013, 28 (3), pp.491-502. ⟨10.1002/palo.20042⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2013 ftccsdartic https://doi.org/10.1002/palo.20042 2021-12-19T00:33:04Z International audience Dansgaard-Oeschger (D-O) cycles are the most dramatic, frequent, and wide-reaching abrupt climate changes in the geologic record. On Greenland, DO cycles are characterized by an abrupt warming of 10 ± 5°C from a cold stadial to a warm interstadial phase, followed by gradual cooling before a rapid return to stadial conditions. The mechanisms responsible for these millennial cycles are not fully understood but are widely thought to involve abrupt changes in Atlantic Meridional Overturning Circulation due to freshwater perturbations. Here we present a new, high-resolution multiproxy marine sediment core monitoring changes in the warm Atlantic inflow to the Nordic seas as well as in local sea ice cover and influx of ice-rafted debris. In contrast to previous studies, the freshwater input is found to be coincident with warm interstadials on Greenland and has a Fennoscandian rather than Laurentide source. Furthermore, the data suggest a different thermohaline structure for the Nordic seas during cold stadials in which relatively warm Atlantic water circulates beneath a fresh surface layer and the presence of sea ice is inferred from benthic oxygen isotopes. This implies a delicate balance between the warm subsurface Atlantic water and fresh surface layer, with the possibility of abrupt changes in sea ice cover, and suggests a novel mechanism for the abrupt DO events observed in Greenland ice cores. Article in Journal/Newspaper Fennoscandian Greenland Greenland ice cores Nordic Seas Sea ice Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Greenland Paleoceanography 28 3 491 502 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Dokken, Trond Nisancioglu, Kerim Li, Camille Battisti, David Kissel, Catherine Dansgaard-Oeschger cycles: Interactions between ocean and sea ice intrinsic to the Nordic seas |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience Dansgaard-Oeschger (D-O) cycles are the most dramatic, frequent, and wide-reaching abrupt climate changes in the geologic record. On Greenland, DO cycles are characterized by an abrupt warming of 10 ± 5°C from a cold stadial to a warm interstadial phase, followed by gradual cooling before a rapid return to stadial conditions. The mechanisms responsible for these millennial cycles are not fully understood but are widely thought to involve abrupt changes in Atlantic Meridional Overturning Circulation due to freshwater perturbations. Here we present a new, high-resolution multiproxy marine sediment core monitoring changes in the warm Atlantic inflow to the Nordic seas as well as in local sea ice cover and influx of ice-rafted debris. In contrast to previous studies, the freshwater input is found to be coincident with warm interstadials on Greenland and has a Fennoscandian rather than Laurentide source. Furthermore, the data suggest a different thermohaline structure for the Nordic seas during cold stadials in which relatively warm Atlantic water circulates beneath a fresh surface layer and the presence of sea ice is inferred from benthic oxygen isotopes. This implies a delicate balance between the warm subsurface Atlantic water and fresh surface layer, with the possibility of abrupt changes in sea ice cover, and suggests a novel mechanism for the abrupt DO events observed in Greenland ice cores. |
author2 |
Bjerknes Centre for Climate Research (BCCR) Department of Biological Sciences Bergen (BIO / UiB) University of Bergen (UiB)-University of Bergen (UiB) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Climat et Magnétisme (CLIMAG) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) |
format |
Article in Journal/Newspaper |
author |
Dokken, Trond Nisancioglu, Kerim Li, Camille Battisti, David Kissel, Catherine |
author_facet |
Dokken, Trond Nisancioglu, Kerim Li, Camille Battisti, David Kissel, Catherine |
author_sort |
Dokken, Trond |
title |
Dansgaard-Oeschger cycles: Interactions between ocean and sea ice intrinsic to the Nordic seas |
title_short |
Dansgaard-Oeschger cycles: Interactions between ocean and sea ice intrinsic to the Nordic seas |
title_full |
Dansgaard-Oeschger cycles: Interactions between ocean and sea ice intrinsic to the Nordic seas |
title_fullStr |
Dansgaard-Oeschger cycles: Interactions between ocean and sea ice intrinsic to the Nordic seas |
title_full_unstemmed |
Dansgaard-Oeschger cycles: Interactions between ocean and sea ice intrinsic to the Nordic seas |
title_sort |
dansgaard-oeschger cycles: interactions between ocean and sea ice intrinsic to the nordic seas |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.archives-ouvertes.fr/hal-03118206 https://hal.archives-ouvertes.fr/hal-03118206/document https://hal.archives-ouvertes.fr/hal-03118206/file/palo.20042.pdf https://doi.org/10.1002/palo.20042 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Fennoscandian Greenland Greenland ice cores Nordic Seas Sea ice |
genre_facet |
Fennoscandian Greenland Greenland ice cores Nordic Seas Sea ice |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.archives-ouvertes.fr/hal-03118206 Paleoceanography, American Geophysical Union, 2013, 28 (3), pp.491-502. ⟨10.1002/palo.20042⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/palo.20042 hal-03118206 https://hal.archives-ouvertes.fr/hal-03118206 https://hal.archives-ouvertes.fr/hal-03118206/document https://hal.archives-ouvertes.fr/hal-03118206/file/palo.20042.pdf doi:10.1002/palo.20042 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/palo.20042 |
container_title |
Paleoceanography |
container_volume |
28 |
container_issue |
3 |
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491 |
op_container_end_page |
502 |
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