Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e
Environmental conditions during Marine Isotope Stage (MIS) 5e (130–116 ka) represent an important “process analogue” for understanding the climatic responses to present and future anthropogenic warming. The response of Antarctic sea ice to global warming is particularly uncertain due to the short le...
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European Geosciences Union
2022
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ftnerc:oai:nora.nerc.ac.uk:530920 2023-05-15T13:41:46+02:00 Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e Chadwick, Matthew Allen, Claire S. Sime, Louise C. Crosta, Xavier Hillenbrand, Claus-Dieter 2022-01-24 text http://nora.nerc.ac.uk/id/eprint/530920/ https://nora.nerc.ac.uk/id/eprint/530920/1/cp-18-129-2022.pdf https://cp.copernicus.org/articles/18/129/2022/cp-18-129-2022.html en eng European Geosciences Union https://nora.nerc.ac.uk/id/eprint/530920/1/cp-18-129-2022.pdf Chadwick, Matthew orcid:0000-0002-3861-4564 Allen, Claire S. orcid:0000-0002-0938-0551 Sime, Louise C. orcid:0000-0002-9093-7926 Crosta, Xavier; Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 . 2022 Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e [in special issue: Reconstructing Southern Ocean sea-ice dynamics on glacial-to-historical timescales] Climate of the Past, 18. 129-146. https://doi.org/10.5194/cp-18-129-2022 <https://doi.org/10.5194/cp-18-129-2022> cc_by_4 CC-BY Publication - Article PeerReviewed 2022 ftnerc https://doi.org/10.5194/cp-18-129-2022 2023-02-04T19:52:28Z Environmental conditions during Marine Isotope Stage (MIS) 5e (130–116 ka) represent an important “process analogue” for understanding the climatic responses to present and future anthropogenic warming. The response of Antarctic sea ice to global warming is particularly uncertain due to the short length of the observational record. Reconstructing Antarctic winter sea-ice extent during MIS 5e therefore provides insights into the temporal and spatial patterns of sea-ice change under a warmer-than-present climate. This study presents new MIS 5e records from nine marine sediment cores located south of the Antarctic Polar Front between 55 and 70∘ S. Winter sea-ice extent and sea-surface temperatures are reconstructed using marine diatom assemblages and a modern analogue technique transfer function, and changes in these environmental variables between the three Southern Ocean sectors are investigated. The Atlantic and East Indian sector records show much more variable MIS 5e winter sea-ice extent and sea-surface temperatures than the Pacific sector records. High variability in the Atlantic sector winter sea-ice extent is attributed to high glacial meltwater flux in the Weddell Sea, indicated by increased abundances of the diatom species Eucampia antarctica and Fragilariopsis cylindrus. The high variability in the East Indian sector winter sea-ice extent is conversely believed to result from large latitudinal migrations of the flow bands of the Antarctic Circumpolar Current, inferred from latitudinal shifts in the sea-surface temperature isotherms. Overall, these findings suggest that Pacific sector winter sea ice displays a low sensitivity to warmer climates. The different variability and sensitivity of Antarctic winter sea-ice extent in the three Southern Ocean sectors during MIS 5e may have significant implications for the Southern Hemisphere climatic system under future warming. Article in Journal/Newspaper Antarc* Antarctic Antarctica Sea ice Southern Ocean Weddell Sea Natural Environment Research Council: NERC Open Research Archive Antarctic Southern Ocean The Antarctic Weddell Sea Pacific Indian Weddell Climate of the Past 18 1 129 146 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Environmental conditions during Marine Isotope Stage (MIS) 5e (130–116 ka) represent an important “process analogue” for understanding the climatic responses to present and future anthropogenic warming. The response of Antarctic sea ice to global warming is particularly uncertain due to the short length of the observational record. Reconstructing Antarctic winter sea-ice extent during MIS 5e therefore provides insights into the temporal and spatial patterns of sea-ice change under a warmer-than-present climate. This study presents new MIS 5e records from nine marine sediment cores located south of the Antarctic Polar Front between 55 and 70∘ S. Winter sea-ice extent and sea-surface temperatures are reconstructed using marine diatom assemblages and a modern analogue technique transfer function, and changes in these environmental variables between the three Southern Ocean sectors are investigated. The Atlantic and East Indian sector records show much more variable MIS 5e winter sea-ice extent and sea-surface temperatures than the Pacific sector records. High variability in the Atlantic sector winter sea-ice extent is attributed to high glacial meltwater flux in the Weddell Sea, indicated by increased abundances of the diatom species Eucampia antarctica and Fragilariopsis cylindrus. The high variability in the East Indian sector winter sea-ice extent is conversely believed to result from large latitudinal migrations of the flow bands of the Antarctic Circumpolar Current, inferred from latitudinal shifts in the sea-surface temperature isotherms. Overall, these findings suggest that Pacific sector winter sea ice displays a low sensitivity to warmer climates. The different variability and sensitivity of Antarctic winter sea-ice extent in the three Southern Ocean sectors during MIS 5e may have significant implications for the Southern Hemisphere climatic system under future warming. |
format |
Article in Journal/Newspaper |
author |
Chadwick, Matthew Allen, Claire S. Sime, Louise C. Crosta, Xavier Hillenbrand, Claus-Dieter |
spellingShingle |
Chadwick, Matthew Allen, Claire S. Sime, Louise C. Crosta, Xavier Hillenbrand, Claus-Dieter Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e |
author_facet |
Chadwick, Matthew Allen, Claire S. Sime, Louise C. Crosta, Xavier Hillenbrand, Claus-Dieter |
author_sort |
Chadwick, Matthew |
title |
Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e |
title_short |
Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e |
title_full |
Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e |
title_fullStr |
Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e |
title_full_unstemmed |
Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e |
title_sort |
reconstructing antarctic winter sea-ice extent during marine isotope stage 5e |
publisher |
European Geosciences Union |
publishDate |
2022 |
url |
http://nora.nerc.ac.uk/id/eprint/530920/ https://nora.nerc.ac.uk/id/eprint/530920/1/cp-18-129-2022.pdf https://cp.copernicus.org/articles/18/129/2022/cp-18-129-2022.html |
geographic |
Antarctic Southern Ocean The Antarctic Weddell Sea Pacific Indian Weddell |
geographic_facet |
Antarctic Southern Ocean The Antarctic Weddell Sea Pacific Indian Weddell |
genre |
Antarc* Antarctic Antarctica Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Sea ice Southern Ocean Weddell Sea |
op_relation |
https://nora.nerc.ac.uk/id/eprint/530920/1/cp-18-129-2022.pdf Chadwick, Matthew orcid:0000-0002-3861-4564 Allen, Claire S. orcid:0000-0002-0938-0551 Sime, Louise C. orcid:0000-0002-9093-7926 Crosta, Xavier; Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 . 2022 Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e [in special issue: Reconstructing Southern Ocean sea-ice dynamics on glacial-to-historical timescales] Climate of the Past, 18. 129-146. https://doi.org/10.5194/cp-18-129-2022 <https://doi.org/10.5194/cp-18-129-2022> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cp-18-129-2022 |
container_title |
Climate of the Past |
container_volume |
18 |
container_issue |
1 |
container_start_page |
129 |
op_container_end_page |
146 |
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1766157568078512128 |