A spatiotemporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard–Oeschger events 5–8
Here, we establish a spatiotemporal evolution of the sea-surface temperatures in the North Atlantic over Dansgaard–Oeschger (DO) events 5–8 (approximately 30–40 kyr) using the proxy surrogate reconstruction method. Proxy data suggest a large variability in North Atlantic sea-surface temperatures dur...
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ftdoajarticles:oai:doaj.org/article:0e97d1616eca403f94da1bb765ef4f56 2023-05-15T16:00:05+02:00 A spatiotemporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard–Oeschger events 5–8 M. F. Jensen A. Nummelin S. B. Nielsen H. Sadatzki E. Sessford B. Risebrobakken C. Andersson A. Voelker W. H. G. Roberts J. Pedro A. Born 2018-06-01T00:00:00Z https://doi.org/10.5194/cp-14-901-2018 https://doaj.org/article/0e97d1616eca403f94da1bb765ef4f56 EN eng Copernicus Publications https://www.clim-past.net/14/901/2018/cp-14-901-2018.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-14-901-2018 1814-9324 1814-9332 https://doaj.org/article/0e97d1616eca403f94da1bb765ef4f56 Climate of the Past, Vol 14, Pp 901-922 (2018) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2018 ftdoajarticles https://doi.org/10.5194/cp-14-901-2018 2022-12-31T14:03:23Z Here, we establish a spatiotemporal evolution of the sea-surface temperatures in the North Atlantic over Dansgaard–Oeschger (DO) events 5–8 (approximately 30–40 kyr) 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. This is the first time the proxy surrogate reconstruction method has been applied to oceanic variability during MIS3. Our results remain robust, even when age uncertainties of proxy data, the number of available temperature reconstructions, and different climate models are considered. However, we also highlight shortcomings of the methodology that should be addressed in future implementations. Article in Journal/Newspaper Dansgaard-Oeschger events North Atlantic Sea ice Directory of Open Access Journals: DOAJ Articles Climate of the Past 14 6 901 922 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 M. F. Jensen A. Nummelin S. B. Nielsen H. Sadatzki E. Sessford B. Risebrobakken C. Andersson A. Voelker W. H. G. Roberts J. Pedro A. Born A spatiotemporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard–Oeschger events 5–8 |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Here, we establish a spatiotemporal evolution of the sea-surface temperatures in the North Atlantic over Dansgaard–Oeschger (DO) events 5–8 (approximately 30–40 kyr) 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. This is the first time the proxy surrogate reconstruction method has been applied to oceanic variability during MIS3. Our results remain robust, even when age uncertainties of proxy data, the number of available temperature reconstructions, and different climate models are considered. However, we also highlight shortcomings of the methodology that should be addressed in future implementations. |
format |
Article in Journal/Newspaper |
author |
M. F. Jensen A. Nummelin S. B. Nielsen H. Sadatzki E. Sessford B. Risebrobakken C. Andersson A. Voelker W. H. G. Roberts J. Pedro A. Born |
author_facet |
M. F. Jensen A. Nummelin S. B. Nielsen H. Sadatzki E. Sessford B. Risebrobakken C. Andersson A. Voelker W. H. G. Roberts J. Pedro A. Born |
author_sort |
M. F. Jensen |
title |
A spatiotemporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard–Oeschger events 5–8 |
title_short |
A spatiotemporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard–Oeschger events 5–8 |
title_full |
A spatiotemporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard–Oeschger events 5–8 |
title_fullStr |
A spatiotemporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard–Oeschger events 5–8 |
title_full_unstemmed |
A spatiotemporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard–Oeschger events 5–8 |
title_sort |
spatiotemporal reconstruction of sea-surface temperatures in the north atlantic during dansgaard–oeschger events 5–8 |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-14-901-2018 https://doaj.org/article/0e97d1616eca403f94da1bb765ef4f56 |
genre |
Dansgaard-Oeschger events North Atlantic Sea ice |
genre_facet |
Dansgaard-Oeschger events North Atlantic Sea ice |
op_source |
Climate of the Past, Vol 14, Pp 901-922 (2018) |
op_relation |
https://www.clim-past.net/14/901/2018/cp-14-901-2018.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-14-901-2018 1814-9324 1814-9332 https://doaj.org/article/0e97d1616eca403f94da1bb765ef4f56 |
op_doi |
https://doi.org/10.5194/cp-14-901-2018 |
container_title |
Climate of the Past |
container_volume |
14 |
container_issue |
6 |
container_start_page |
901 |
op_container_end_page |
922 |
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1766395956401537024 |