Southern Ocean carbon sink enhanced by sea-ice feedbacks at the Antarctic Cold Reversal
Author
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Fogwill, C. J.
Author
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Turney, C. S. M.
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Menviel, L.
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Baker, A.
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Weber, M. E.
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Ellis, B.
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Thomas, Z. A.
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Golledge, N. R.
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Etheridge, D.
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Rubino, M.
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Thornton, D. P.
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van Ommen, T. D.
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Moy, A. D.
Author
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Curran, M. A. J.
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Davies, S.
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Bird, M., I
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Munksgaard, N. C.
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Rootes, C. M.
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Millman, H.
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Vohra, J.
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Rivera, A.
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Mackintosh, A.
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Pike, J.
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Hall, I. R.
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Bagshaw, E. A.
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Rainsley, E.
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Bronk-Ramsey, C.
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Montenari, M.
Author
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Cage, A. G.
Author
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Harris, M. R. P.
Author
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Jones, R.
Author
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Power, A.
Author
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Love, J.
Author
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Young, J.
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Weyrich, L. S.
Author
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Cooper, A.
Admission date
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2020-08-07T16:55:28Z
Available date
dc.date.available
2020-08-07T16:55:28Z
Publication date
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2020
Cita de ítem
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Nature Geoscience | Vol 13 | July 2020 | 489–497
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Identifier
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10.1038/s41561-020-0587-0
Identifier
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https://repositorio.uchile.cl/handle/2250/176350
Abstract
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Increased Southern Ocean productivity driven by sea-ice feedbacks contributed to a slowdown in rising CO(2)levels during the last deglaciation, according to analyses of marine-derived aerosols from an Antarctic ice core.
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 kyrbp), 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 CO(2)sequestration and created a substantial regional marine carbon sink, which contributed to the plateau in CO(2)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.
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Patrocinador
dc.description.sponsorship
Australian Research Council
Royal Society of NZ fellowships
Linkage Partner Antarctic Logistics and Expeditions
LP120200724
Australian Climate Change Science Program (ACCSP), an Australian Government Initiative
Coleg Cymraeg Cenedlaethol
European Research Council (ERC)
25923
German Research Foundation (DFG)
We2039/8-1
Keele University