Sea ice variability in the southern Norwegian Sea during glacial Dansgaard-Oeschger climate cycles
The last glacial period was marked by pronounced millennial-scale variability in ocean circulation and global climate. Shifts in sea ice cover within the Nordic Seas are believed to have amplified the glacial climate variability in northern high latitudes and contributed to abrupt, high-amplitude te...
Published in: | Science Advances |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
AAAS
2020
|
Subjects: | |
Online Access: | https://hdl.handle.net/1956/22214 https://doi.org/10.1126/sciadv.aau6174 |
id |
ftunivbergen:oai:bora.uib.no:1956/22214 |
---|---|
record_format |
openpolar |
spelling |
ftunivbergen:oai:bora.uib.no:1956/22214 2023-05-15T16:27:26+02:00 Sea ice variability in the southern Norwegian Sea during glacial Dansgaard-Oeschger climate cycles Sadatzki, Henrik Dokken, Trond Martin Berben, Sarah Miche Patricia Muschitiello, Francesco Stein, Ruediger Fahl, Kirsten Menviel, Laurie Timmermann, Axel Jansen, Eystein 2020-02-18T16:06:42Z application/pdf https://hdl.handle.net/1956/22214 https://doi.org/10.1126/sciadv.aau6174 eng eng AAAS urn:issn:0975-1041 urn:issn:0019-5596 https://hdl.handle.net/1956/22214 https://doi.org/10.1126/sciadv.aau6174 cristin:1719892 Attribution-NonCommercial CC BY-NC http://creativecommons.org/ licenses/by-nc-nd/4.0 Copyright 2019 The Author(s) Indian Journal of Pure & Applied Physics Peer reviewed Journal article 2020 ftunivbergen https://doi.org/10.1126/sciadv.aau6174 2023-03-14T17:44:38Z The last glacial period was marked by pronounced millennial-scale variability in ocean circulation and global climate. Shifts in sea ice cover within the Nordic Seas are believed to have amplified the glacial climate variability in northern high latitudes and contributed to abrupt, high-amplitude temperature changes over Greenland. We present unprecedented empirical evidence that resolves the nature, timing, and role of sea ice fluctuations for abrupt ocean and climate change 32 to 40 thousand years ago, using biomarker sea ice reconstructions from the southern Norwegian Sea. Our results document that initial sea ice reductions at the core site preceded the major reinvigoration of convective deep-water formation in the Nordic Seas and abrupt Greenland warming; sea ice expansions preceded the buildup of a deep oceanic heat reservoir. Our findings suggest that the sea ice variability shaped regime shifts between surface stratification and deep convection in the Nordic Seas during abrupt climate changes. publishedVersion Article in Journal/Newspaper Greenland Nordic Seas Norwegian Sea Sea ice University of Bergen: Bergen Open Research Archive (BORA-UiB) Greenland Norwegian Sea Science Advances 5 3 eaau6174 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
The last glacial period was marked by pronounced millennial-scale variability in ocean circulation and global climate. Shifts in sea ice cover within the Nordic Seas are believed to have amplified the glacial climate variability in northern high latitudes and contributed to abrupt, high-amplitude temperature changes over Greenland. We present unprecedented empirical evidence that resolves the nature, timing, and role of sea ice fluctuations for abrupt ocean and climate change 32 to 40 thousand years ago, using biomarker sea ice reconstructions from the southern Norwegian Sea. Our results document that initial sea ice reductions at the core site preceded the major reinvigoration of convective deep-water formation in the Nordic Seas and abrupt Greenland warming; sea ice expansions preceded the buildup of a deep oceanic heat reservoir. Our findings suggest that the sea ice variability shaped regime shifts between surface stratification and deep convection in the Nordic Seas during abrupt climate changes. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Sadatzki, Henrik Dokken, Trond Martin Berben, Sarah Miche Patricia Muschitiello, Francesco Stein, Ruediger Fahl, Kirsten Menviel, Laurie Timmermann, Axel Jansen, Eystein |
spellingShingle |
Sadatzki, Henrik Dokken, Trond Martin Berben, Sarah Miche Patricia Muschitiello, Francesco Stein, Ruediger Fahl, Kirsten Menviel, Laurie Timmermann, Axel Jansen, Eystein Sea ice variability in the southern Norwegian Sea during glacial Dansgaard-Oeschger climate cycles |
author_facet |
Sadatzki, Henrik Dokken, Trond Martin Berben, Sarah Miche Patricia Muschitiello, Francesco Stein, Ruediger Fahl, Kirsten Menviel, Laurie Timmermann, Axel Jansen, Eystein |
author_sort |
Sadatzki, Henrik |
title |
Sea ice variability in the southern Norwegian Sea during glacial Dansgaard-Oeschger climate cycles |
title_short |
Sea ice variability in the southern Norwegian Sea during glacial Dansgaard-Oeschger climate cycles |
title_full |
Sea ice variability in the southern Norwegian Sea during glacial Dansgaard-Oeschger climate cycles |
title_fullStr |
Sea ice variability in the southern Norwegian Sea during glacial Dansgaard-Oeschger climate cycles |
title_full_unstemmed |
Sea ice variability in the southern Norwegian Sea during glacial Dansgaard-Oeschger climate cycles |
title_sort |
sea ice variability in the southern norwegian sea during glacial dansgaard-oeschger climate cycles |
publisher |
AAAS |
publishDate |
2020 |
url |
https://hdl.handle.net/1956/22214 https://doi.org/10.1126/sciadv.aau6174 |
geographic |
Greenland Norwegian Sea |
geographic_facet |
Greenland Norwegian Sea |
genre |
Greenland Nordic Seas Norwegian Sea Sea ice |
genre_facet |
Greenland Nordic Seas Norwegian Sea Sea ice |
op_source |
Indian Journal of Pure & Applied Physics |
op_relation |
urn:issn:0975-1041 urn:issn:0019-5596 https://hdl.handle.net/1956/22214 https://doi.org/10.1126/sciadv.aau6174 cristin:1719892 |
op_rights |
Attribution-NonCommercial CC BY-NC http://creativecommons.org/ licenses/by-nc-nd/4.0 Copyright 2019 The Author(s) |
op_doi |
https://doi.org/10.1126/sciadv.aau6174 |
container_title |
Science Advances |
container_volume |
5 |
container_issue |
3 |
container_start_page |
eaau6174 |
_version_ |
1766016614365396992 |