A spatio-temporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard-Oeschger events 5–8
Here we establish a spatio-temporal evolution of the sea-surface temperatures in the North Atlantic over Dansgaard Oeschger (DO) events 5–8 (c. 30–40 ka) using the proxy surrogate reconstruction method. Proxy data suggest a large variability in North Atlantic sea-surface temperatures during the DO-e...
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Language: | English |
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ftunivbergen:oai:bora.uib.no:1956/17100 2023-05-15T16:00:03+02:00 A spatio-temporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard-Oeschger events 5–8 Jensen, Mari Fjalstad Nummelin, Aleksi Nielsen, Søren B. Sadatzki, Henrik Sessford, Evangeline Risebrobakken, Bjørg Andersson, Carin Voelker, Antje Roberts, William H. G. Born, Andreas 2017-08-24 application/pdf https://hdl.handle.net/1956/17100 https://doi.org/10.5194/cp-2017-103 eng eng Copernicus Publications Abrupt changes in sea ice and dynamics of Dansgaard-Oeschger events urn:issn:1814-9340 https://hdl.handle.net/1956/17100 https://doi.org/10.5194/cp-2017-103 Attribution CC BY http://creativecommons.org/licenses/by/4.0 Copyright 2017 The Author(s) Climate of the Past Discussions Journal article 2017 ftunivbergen https://doi.org/10.5194/cp-2017-103 2023-03-14T17:41:25Z Here we establish a spatio-temporal evolution of the sea-surface temperatures in the North Atlantic over Dansgaard Oeschger (DO) events 5–8 (c. 30–40 ka) using the proxy surrogate reconstruction method. Proxy data suggest a large variability in North Atlantic sea-surface temperatures during the DO-events of the last glacial period. However, proxy data availability is limited and cannot provide a full spatial picture of the oceanic changes. Therefore, we combine fully coupled, general circulation model simulations with planktic foraminifera based sea-surface temperature reconstructions to obtain a broader spatial picture of the ocean state during DO-events 5–8. The resulting spatial sea-surface temperature patterns agree over a number of different general circulation models and simulations. We find that sea-surface temperature variability over the DO-events is characterized by colder conditions in the subpolar North Atlantic during stadials than during interstadials, and the variability is linked to changes in the Atlantic Meridional Overturning circulation, and in the sea-ice cover. Forced simulations are needed to capture the strength of the temperature variability and to reconstruct the variability in other climatic records not directly linked to the sea-surface temperature reconstructions. Our results are robust to uncertainties in the age models of the proxy data, the number of available temperature reconstructions, and over a range of climate models. submittedVersion Article in Journal/Newspaper Dansgaard-Oeschger events North Atlantic Sea ice University of Bergen: Bergen Open Research Archive (BORA-UiB) Climate of the Past Discussions 1 36 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
Here we establish a spatio-temporal evolution of the sea-surface temperatures in the North Atlantic over Dansgaard Oeschger (DO) events 5–8 (c. 30–40 ka) using the proxy surrogate reconstruction method. Proxy data suggest a large variability in North Atlantic sea-surface temperatures during the DO-events of the last glacial period. However, proxy data availability is limited and cannot provide a full spatial picture of the oceanic changes. Therefore, we combine fully coupled, general circulation model simulations with planktic foraminifera based sea-surface temperature reconstructions to obtain a broader spatial picture of the ocean state during DO-events 5–8. The resulting spatial sea-surface temperature patterns agree over a number of different general circulation models and simulations. We find that sea-surface temperature variability over the DO-events is characterized by colder conditions in the subpolar North Atlantic during stadials than during interstadials, and the variability is linked to changes in the Atlantic Meridional Overturning circulation, and in the sea-ice cover. Forced simulations are needed to capture the strength of the temperature variability and to reconstruct the variability in other climatic records not directly linked to the sea-surface temperature reconstructions. Our results are robust to uncertainties in the age models of the proxy data, the number of available temperature reconstructions, and over a range of climate models. submittedVersion |
format |
Article in Journal/Newspaper |
author |
Jensen, Mari Fjalstad Nummelin, Aleksi Nielsen, Søren B. Sadatzki, Henrik Sessford, Evangeline Risebrobakken, Bjørg Andersson, Carin Voelker, Antje Roberts, William H. G. Born, Andreas |
spellingShingle |
Jensen, Mari Fjalstad Nummelin, Aleksi Nielsen, Søren B. Sadatzki, Henrik Sessford, Evangeline Risebrobakken, Bjørg Andersson, Carin Voelker, Antje Roberts, William H. G. Born, Andreas A spatio-temporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard-Oeschger events 5–8 |
author_facet |
Jensen, Mari Fjalstad Nummelin, Aleksi Nielsen, Søren B. Sadatzki, Henrik Sessford, Evangeline Risebrobakken, Bjørg Andersson, Carin Voelker, Antje Roberts, William H. G. Born, Andreas |
author_sort |
Jensen, Mari Fjalstad |
title |
A spatio-temporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard-Oeschger events 5–8 |
title_short |
A spatio-temporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard-Oeschger events 5–8 |
title_full |
A spatio-temporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard-Oeschger events 5–8 |
title_fullStr |
A spatio-temporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard-Oeschger events 5–8 |
title_full_unstemmed |
A spatio-temporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard-Oeschger events 5–8 |
title_sort |
spatio-temporal reconstruction of sea-surface temperatures in the north atlantic during dansgaard-oeschger events 5–8 |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://hdl.handle.net/1956/17100 https://doi.org/10.5194/cp-2017-103 |
genre |
Dansgaard-Oeschger events North Atlantic Sea ice |
genre_facet |
Dansgaard-Oeschger events North Atlantic Sea ice |
op_source |
Climate of the Past Discussions |
op_relation |
Abrupt changes in sea ice and dynamics of Dansgaard-Oeschger events urn:issn:1814-9340 https://hdl.handle.net/1956/17100 https://doi.org/10.5194/cp-2017-103 |
op_rights |
Attribution CC BY http://creativecommons.org/licenses/by/4.0 Copyright 2017 The Author(s) |
op_doi |
https://doi.org/10.5194/cp-2017-103 |
container_title |
Climate of the Past Discussions |
container_start_page |
1 |
op_container_end_page |
36 |
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1766395928601690112 |