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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ftdoajarticles:oai:doaj.org/article:97c224dd00274a3e89900d0641b36ab0 2023-05-15T13:52:54+02:00 Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e M. Chadwick C. S. Allen L. C. Sime X. Crosta C.-D. Hillenbrand 2022-01-01T00:00:00Z https://doi.org/10.5194/cp-18-129-2022 https://doaj.org/article/97c224dd00274a3e89900d0641b36ab0 EN eng Copernicus Publications https://cp.copernicus.org/articles/18/129/2022/cp-18-129-2022.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-18-129-2022 1814-9324 1814-9332 https://doaj.org/article/97c224dd00274a3e89900d0641b36ab0 Climate of the Past, Vol 18, Pp 129-146 (2022) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2022 ftdoajarticles https://doi.org/10.5194/cp-18-129-2022 2022-12-30T20:27:02Z 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 Directory of Open Access Journals: DOAJ Articles Antarctic Indian Pacific Southern Ocean The Antarctic Weddell Weddell Sea Climate of the Past 18 1 129 146 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 M. Chadwick C. S. Allen L. C. Sime X. Crosta C.-D. Hillenbrand Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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 |
M. Chadwick C. S. Allen L. C. Sime X. Crosta C.-D. Hillenbrand |
author_facet |
M. Chadwick C. S. Allen L. C. Sime X. Crosta C.-D. Hillenbrand |
author_sort |
M. Chadwick |
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 |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/cp-18-129-2022 https://doaj.org/article/97c224dd00274a3e89900d0641b36ab0 |
geographic |
Antarctic Indian Pacific Southern Ocean The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Indian Pacific Southern Ocean The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctica Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Sea ice Southern Ocean Weddell Sea |
op_source |
Climate of the Past, Vol 18, Pp 129-146 (2022) |
op_relation |
https://cp.copernicus.org/articles/18/129/2022/cp-18-129-2022.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-18-129-2022 1814-9324 1814-9332 https://doaj.org/article/97c224dd00274a3e89900d0641b36ab0 |
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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1766257754139262976 |