Southern Ocean carbon sink enhanced by sea-ice feedbacks at the Antarctic cold reversal
The Southern Ocean occupies 14% of the Earth’s surface and plays a fundamental role in the global carbon cycle and climate. It provides a direct connection to the deep ocean carbon reservoir through biogeochemical processes that include surface primary productivity, remineralization at depth and the...
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Language: | English |
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Springer Nature
2020
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Online Access: | https://doi.org/10.1038/s41561-020-0587-0 https://ora.ox.ac.uk/objects/uuid:41b6a4df-b574-474e-8d4d-0591709443f1 |
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ftuloxford:oai:ora.ox.ac.uk:uuid:41b6a4df-b574-474e-8d4d-0591709443f1 2024-10-06T13:44:07+00:00 Southern Ocean carbon sink enhanced by sea-ice feedbacks at the Antarctic cold reversal Fogwill, CJ Turney , CSM Menviel , L Ramsey, C 2020-07-08 https://doi.org/10.1038/s41561-020-0587-0 https://ora.ox.ac.uk/objects/uuid:41b6a4df-b574-474e-8d4d-0591709443f1 eng eng Springer Nature doi:10.1038/s41561-020-0587-0 https://ora.ox.ac.uk/objects/uuid:41b6a4df-b574-474e-8d4d-0591709443f1 https://doi.org/10.1038/s41561-020-0587-0 info:eu-repo/semantics/openAccess Journal article 2020 ftuloxford https://doi.org/10.1038/s41561-020-0587-0 2024-09-06T07:47:32Z The Southern Ocean occupies 14% of the Earth’s surface and plays a fundamental role in the global carbon cycle and climate. It provides a direct connection to the deep ocean carbon reservoir through biogeochemical processes that include surface primary productivity, remineralization at depth and the upwelling of carbon-rich water masses. However, the role of these different processes in modulating past and future air–sea carbon flux remains poorly understood. A key period in this regard is the Antarctic Cold Reversal (ACR, 14.6–12.7 kyr BP), when mid- to high-latitude Southern Hemisphere cooling coincided with a sustained plateau in the global deglacial increase in atmospheric CO2. Here we reconstruct high-latitude Southern Ocean surface productivity from marine-derived aerosols captured in a highly resolved horizontal ice core. Our multiproxy reconstruction reveals a sustained signal of enhanced marine productivity across the ACR. Transient climate modelling indicates this period coincided with maximum seasonal variability in sea-ice extent, implying that sea-ice biological feedbacks enhanced CO2 sequestration and created a substantial regional marine carbon sink, which contributed to the plateau in CO2 during the ACR. Our results highlight the role Antarctic sea ice plays in controlling global CO2, and demonstrate the need to incorporate such feedbacks into climate–carbon models. Article in Journal/Newspaper Antarc* Antarctic ice core Sea ice Southern Ocean ORA - Oxford University Research Archive Antarctic Southern Ocean The Antarctic Nature Geoscience 13 7 489 497 |
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Open Polar |
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ORA - Oxford University Research Archive |
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ftuloxford |
language |
English |
description |
The Southern Ocean occupies 14% of the Earth’s surface and plays a fundamental role in the global carbon cycle and climate. It provides a direct connection to the deep ocean carbon reservoir through biogeochemical processes that include surface primary productivity, remineralization at depth and the upwelling of carbon-rich water masses. However, the role of these different processes in modulating past and future air–sea carbon flux remains poorly understood. A key period in this regard is the Antarctic Cold Reversal (ACR, 14.6–12.7 kyr BP), when mid- to high-latitude Southern Hemisphere cooling coincided with a sustained plateau in the global deglacial increase in atmospheric CO2. Here we reconstruct high-latitude Southern Ocean surface productivity from marine-derived aerosols captured in a highly resolved horizontal ice core. Our multiproxy reconstruction reveals a sustained signal of enhanced marine productivity across the ACR. Transient climate modelling indicates this period coincided with maximum seasonal variability in sea-ice extent, implying that sea-ice biological feedbacks enhanced CO2 sequestration and created a substantial regional marine carbon sink, which contributed to the plateau in CO2 during the ACR. Our results highlight the role Antarctic sea ice plays in controlling global CO2, and demonstrate the need to incorporate such feedbacks into climate–carbon models. |
format |
Article in Journal/Newspaper |
author |
Fogwill, CJ Turney , CSM Menviel , L Ramsey, C |
spellingShingle |
Fogwill, CJ Turney , CSM Menviel , L Ramsey, C Southern Ocean carbon sink enhanced by sea-ice feedbacks at the Antarctic cold reversal |
author_facet |
Fogwill, CJ Turney , CSM Menviel , L Ramsey, C |
author_sort |
Fogwill, CJ |
title |
Southern Ocean carbon sink enhanced by sea-ice feedbacks at the Antarctic cold reversal |
title_short |
Southern Ocean carbon sink enhanced by sea-ice feedbacks at the Antarctic cold reversal |
title_full |
Southern Ocean carbon sink enhanced by sea-ice feedbacks at the Antarctic cold reversal |
title_fullStr |
Southern Ocean carbon sink enhanced by sea-ice feedbacks at the Antarctic cold reversal |
title_full_unstemmed |
Southern Ocean carbon sink enhanced by sea-ice feedbacks at the Antarctic cold reversal |
title_sort |
southern ocean carbon sink enhanced by sea-ice feedbacks at the antarctic cold reversal |
publisher |
Springer Nature |
publishDate |
2020 |
url |
https://doi.org/10.1038/s41561-020-0587-0 https://ora.ox.ac.uk/objects/uuid:41b6a4df-b574-474e-8d4d-0591709443f1 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic ice core Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic ice core Sea ice Southern Ocean |
op_relation |
doi:10.1038/s41561-020-0587-0 https://ora.ox.ac.uk/objects/uuid:41b6a4df-b574-474e-8d4d-0591709443f1 https://doi.org/10.1038/s41561-020-0587-0 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/s41561-020-0587-0 |
container_title |
Nature Geoscience |
container_volume |
13 |
container_issue |
7 |
container_start_page |
489 |
op_container_end_page |
497 |
_version_ |
1812182522290765824 |