Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e
International audience 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 particula...
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Online Access: | https://hal.science/hal-03590874 https://hal.science/hal-03590874/document https://hal.science/hal-03590874/file/Chadwick_CP2022.pdf https://doi.org/10.5194/cp-18-129-2022 |
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ftecolephe:oai:HAL:hal-03590874v1 2024-05-19T07:29:52+00:00 Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e Chadwick, Matthew Allen, Claire Sime, Louise Crosta, Xavier Hillenbrand, Claus-Dieter Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) 2022-01-24 https://hal.science/hal-03590874 https://hal.science/hal-03590874/document https://hal.science/hal-03590874/file/Chadwick_CP2022.pdf https://doi.org/10.5194/cp-18-129-2022 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-18-129-2022 hal-03590874 https://hal.science/hal-03590874 https://hal.science/hal-03590874/document https://hal.science/hal-03590874/file/Chadwick_CP2022.pdf doi:10.5194/cp-18-129-2022 info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-03590874 Climate of the Past, 2022, 18, pp.129 - 146. ⟨10.5194/cp-18-129-2022⟩ [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2022 ftecolephe https://doi.org/10.5194/cp-18-129-2022 2024-04-25T01:24:11Z International audience 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 EPHE (Ecole pratique des hautes études, Paris): HAL Climate of the Past 18 1 129 146 |
institution |
Open Polar |
collection |
EPHE (Ecole pratique des hautes études, Paris): HAL |
op_collection_id |
ftecolephe |
language |
English |
topic |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Chadwick, Matthew Allen, Claire Sime, Louise Crosta, Xavier Hillenbrand, Claus-Dieter Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e |
topic_facet |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience 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. |
author2 |
Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Chadwick, Matthew Allen, Claire Sime, Louise Crosta, Xavier Hillenbrand, Claus-Dieter |
author_facet |
Chadwick, Matthew Allen, Claire Sime, Louise 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 |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-03590874 https://hal.science/hal-03590874/document https://hal.science/hal-03590874/file/Chadwick_CP2022.pdf https://doi.org/10.5194/cp-18-129-2022 |
genre |
Antarc* Antarctic Antarctica Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Sea ice Southern Ocean Weddell Sea |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-03590874 Climate of the Past, 2022, 18, pp.129 - 146. ⟨10.5194/cp-18-129-2022⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-18-129-2022 hal-03590874 https://hal.science/hal-03590874 https://hal.science/hal-03590874/document https://hal.science/hal-03590874/file/Chadwick_CP2022.pdf doi:10.5194/cp-18-129-2022 |
op_rights |
info:eu-repo/semantics/OpenAccess |
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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1799481962470047744 |