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. Our understanding of the response of Antarctic sea ice to global warming is particularly limited...
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ftnerc:oai:nora.nerc.ac.uk:532220 2023-05-15T13:41:46+02:00 Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e Chadwick, Matthew 2021-09 text http://nora.nerc.ac.uk/id/eprint/532220/ https://nora.nerc.ac.uk/id/eprint/532220/1/Chadwick_2021_thesis_final.pdf en eng https://nora.nerc.ac.uk/id/eprint/532220/1/Chadwick_2021_thesis_final.pdf Chadwick, Matthew orcid:0000-0002-3861-4564 . 2021 Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e. University of Southampton, Faculty of Environmental and Life Science, PhD Thesis, 126pp. Publication - Thesis NonPeerReviewed 2021 ftnerc 2023-02-04T19:53:03Z 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. Our understanding of the response of Antarctic sea ice to global warming is particularly limited due to the short length of the observational record. Therefore, reconstructing Antarctic winter sea-ice extent (WSIE) and Southern Ocean sea-surface temperatures (SSTs) during MIS 5e provides insights into the temporal and spatial patterns of sea ice and SST change under a warmer than present climate. This thesis presents new MIS 5e proxy records from a set of marine sediment cores located south of the Antarctic Polar Front, between 55 and 70 o S, alongside an analysis of published Southern Ocean records. The MIS 5e diatom species assemblages in these new cores are used to reconstruct and investigate changes in WSIE and SSTs between the three Southern Ocean sectors. The new proxy reconstructions of MIS 5e WSIE and SSTs are also compared to state-of-the-art climate model outputs. There was high variability in both WSIE and SSTs in the Atlantic and Indian sectors during MIS 5e, compared to the largely stable conditions found in the Pacific sector. All three Southern Ocean sectors reached their minimum WSIE during MIS 5e concurrently, within chronological uncertainties, both with each other and with the peak atmospheric temperature in the EPICA Dome C ice core record. The high variability in the Atlantic sector records is attributed to high glacial meltwater flux into the Weddell Sea whereas the high variability in the Indian sector likely resulted from large latitudinal migrations of the Antarctic Circumpolar Current occurring on a millennial�scale. The different variability and sensitivity of Antarctic WSIE and SSTs between the three Southern Ocean sectors may have significant implications for the Southern Hemisphere climate system under future warming. The latest climate models are currently unable to recreate the MIS ... Text Antarc* Antarctic EPICA ice core Sea ice Southern Ocean Weddell Sea Natural Environment Research Council: NERC Open Research Archive Antarctic Southern Ocean The Antarctic Weddell Sea Pacific Indian Weddell |
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Natural Environment Research Council: NERC Open Research Archive |
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English |
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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. Our understanding of the response of Antarctic sea ice to global warming is particularly limited due to the short length of the observational record. Therefore, reconstructing Antarctic winter sea-ice extent (WSIE) and Southern Ocean sea-surface temperatures (SSTs) during MIS 5e provides insights into the temporal and spatial patterns of sea ice and SST change under a warmer than present climate. This thesis presents new MIS 5e proxy records from a set of marine sediment cores located south of the Antarctic Polar Front, between 55 and 70 o S, alongside an analysis of published Southern Ocean records. The MIS 5e diatom species assemblages in these new cores are used to reconstruct and investigate changes in WSIE and SSTs between the three Southern Ocean sectors. The new proxy reconstructions of MIS 5e WSIE and SSTs are also compared to state-of-the-art climate model outputs. There was high variability in both WSIE and SSTs in the Atlantic and Indian sectors during MIS 5e, compared to the largely stable conditions found in the Pacific sector. All three Southern Ocean sectors reached their minimum WSIE during MIS 5e concurrently, within chronological uncertainties, both with each other and with the peak atmospheric temperature in the EPICA Dome C ice core record. The high variability in the Atlantic sector records is attributed to high glacial meltwater flux into the Weddell Sea whereas the high variability in the Indian sector likely resulted from large latitudinal migrations of the Antarctic Circumpolar Current occurring on a millennial�scale. The different variability and sensitivity of Antarctic WSIE and SSTs between the three Southern Ocean sectors may have significant implications for the Southern Hemisphere climate system under future warming. The latest climate models are currently unable to recreate the MIS ... |
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Text |
author |
Chadwick, Matthew |
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Chadwick, Matthew Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e |
author_facet |
Chadwick, Matthew |
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 |
publishDate |
2021 |
url |
http://nora.nerc.ac.uk/id/eprint/532220/ https://nora.nerc.ac.uk/id/eprint/532220/1/Chadwick_2021_thesis_final.pdf |
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 EPICA ice core Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic EPICA ice core Sea ice Southern Ocean Weddell Sea |
op_relation |
https://nora.nerc.ac.uk/id/eprint/532220/1/Chadwick_2021_thesis_final.pdf Chadwick, Matthew orcid:0000-0002-3861-4564 . 2021 Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e. University of Southampton, Faculty of Environmental and Life Science, PhD Thesis, 126pp. |
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