Low-frequency Pliocene climate variability in the eastern Nordic Seas
The Pliocene (5.3-2.6Ma) is often described as a relatively stable climatic period, with warm temperatures characterizing high latitudes. New suborbital resolved stable isotope records from Ocean Drilling Program Hole 642B in the eastern Nordic Seas document that the Pliocene was not a stable period...
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ftarchimer:oai:archimer.ifremer.fr:61599 2023-05-15T15:08:30+02:00 Low-frequency Pliocene climate variability in the eastern Nordic Seas Risebrobakken, Bjorg Andersson, Carin De Schepper, Stijn Mcclymont, Erin L. 2016-09 application/pdf https://archimer.ifremer.fr/doc/00504/61599/65864.pdf https://doi.org/10.1002/2015PA002918 https://archimer.ifremer.fr/doc/00504/61599/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00504/61599/65864.pdf doi:10.1002/2015PA002918 https://archimer.ifremer.fr/doc/00504/61599/ info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2016-09 , Vol. 31 , N. 9 , P. 1154-1175 Pliocene Nordic Seas stable isotopes diagenetic calcite paleogeography external and internal forcing text Publication info:eu-repo/semantics/article 2016 ftarchimer https://doi.org/10.1002/2015PA002918 2021-09-23T20:33:05Z The Pliocene (5.3-2.6Ma) is often described as a relatively stable climatic period, with warm temperatures characterizing high latitudes. New suborbital resolved stable isotope records from Ocean Drilling Program Hole 642B in the eastern Nordic Seas document that the Pliocene was not a stable period characterized by one climate. Rather, seven distinct climate phases, each lasting between 150,000 and 400,000years, are identified and characterized in the time interval 5.1-3.1Ma. Four of the transitions between the defined climate phases occurred close to an eccentricity minimum and a minimum in amplitude of change for Northern Hemisphere summer insolation, while two occurred around an eccentricity maximum and a maximum in amplitude in insolation change. Hence, a low-frequency response of the Nordic Seas to insolation forcing is indicated. In addition, paleogeographic and related paleoceanographic changes, expansion of the Arctic sea ice cover, and onset of Northern Hemisphere glaciation were important factors behind the evolving Pliocene low-frequency variability in the eastern Nordic Seas. It is likely that the identified climate phases and transitions are important beyond the Nordic Seas, due to their association with changes to both insolation and paleogeography. However, a strong and variable degree of diagenetic calcite overgrowth is documented for the planktic foraminifera, especially influencing the planktic O-18 results; the absolute values and amplitude of change cannot be taken at face value. Article in Journal/Newspaper Arctic Foraminifera* Nordic Seas Sea ice Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Arctic Paleoceanography 31 9 1154 1175 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Pliocene Nordic Seas stable isotopes diagenetic calcite paleogeography external and internal forcing |
spellingShingle |
Pliocene Nordic Seas stable isotopes diagenetic calcite paleogeography external and internal forcing Risebrobakken, Bjorg Andersson, Carin De Schepper, Stijn Mcclymont, Erin L. Low-frequency Pliocene climate variability in the eastern Nordic Seas |
topic_facet |
Pliocene Nordic Seas stable isotopes diagenetic calcite paleogeography external and internal forcing |
description |
The Pliocene (5.3-2.6Ma) is often described as a relatively stable climatic period, with warm temperatures characterizing high latitudes. New suborbital resolved stable isotope records from Ocean Drilling Program Hole 642B in the eastern Nordic Seas document that the Pliocene was not a stable period characterized by one climate. Rather, seven distinct climate phases, each lasting between 150,000 and 400,000years, are identified and characterized in the time interval 5.1-3.1Ma. Four of the transitions between the defined climate phases occurred close to an eccentricity minimum and a minimum in amplitude of change for Northern Hemisphere summer insolation, while two occurred around an eccentricity maximum and a maximum in amplitude in insolation change. Hence, a low-frequency response of the Nordic Seas to insolation forcing is indicated. In addition, paleogeographic and related paleoceanographic changes, expansion of the Arctic sea ice cover, and onset of Northern Hemisphere glaciation were important factors behind the evolving Pliocene low-frequency variability in the eastern Nordic Seas. It is likely that the identified climate phases and transitions are important beyond the Nordic Seas, due to their association with changes to both insolation and paleogeography. However, a strong and variable degree of diagenetic calcite overgrowth is documented for the planktic foraminifera, especially influencing the planktic O-18 results; the absolute values and amplitude of change cannot be taken at face value. |
format |
Article in Journal/Newspaper |
author |
Risebrobakken, Bjorg Andersson, Carin De Schepper, Stijn Mcclymont, Erin L. |
author_facet |
Risebrobakken, Bjorg Andersson, Carin De Schepper, Stijn Mcclymont, Erin L. |
author_sort |
Risebrobakken, Bjorg |
title |
Low-frequency Pliocene climate variability in the eastern Nordic Seas |
title_short |
Low-frequency Pliocene climate variability in the eastern Nordic Seas |
title_full |
Low-frequency Pliocene climate variability in the eastern Nordic Seas |
title_fullStr |
Low-frequency Pliocene climate variability in the eastern Nordic Seas |
title_full_unstemmed |
Low-frequency Pliocene climate variability in the eastern Nordic Seas |
title_sort |
low-frequency pliocene climate variability in the eastern nordic seas |
publisher |
Amer Geophysical Union |
publishDate |
2016 |
url |
https://archimer.ifremer.fr/doc/00504/61599/65864.pdf https://doi.org/10.1002/2015PA002918 https://archimer.ifremer.fr/doc/00504/61599/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Foraminifera* Nordic Seas Sea ice |
genre_facet |
Arctic Foraminifera* Nordic Seas Sea ice |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2016-09 , Vol. 31 , N. 9 , P. 1154-1175 |
op_relation |
https://archimer.ifremer.fr/doc/00504/61599/65864.pdf doi:10.1002/2015PA002918 https://archimer.ifremer.fr/doc/00504/61599/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1002/2015PA002918 |
container_title |
Paleoceanography |
container_volume |
31 |
container_issue |
9 |
container_start_page |
1154 |
op_container_end_page |
1175 |
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