Southern Ocean carbon sink enhanced by sea-ice feedbacks at the Antarctic Cold Reversal

Fogwill, CJ; Turney, CSM; Menviel, L; Baker, A; Weber, ME; Ellis, B; Thomas, ZA; Golledge, NR; Etheridge, D; Rubino, M; Thornton, DP; van Ommen, TD; Moy, AD; Curran, MAJ; Davies, S; Bird, MI; Munksgaard, NC; Rootes, CM; Millman, H; Vohra, J; Rivera, A; Mackintosh, A; Pike, J; Hall, IR; Bagshaw, EA; Rainsley, E; Bronk-Ramsey, C; Montenari, M; Cage, AG; Harris, MRP; Jones, R; Power, A; Love, J; Young, J; Weyrich, LS; Cooper, A

Southern Ocean carbon sink enhanced by sea-ice feedbacks at the Antarctic Cold Reversal

Fogwill, CJ Turney, CSM Menviel, L Baker, A Weber, ME Ellis, B Thomas, ZA Golledge, NR Etheridge, D Rubino, M Thornton, DP van Ommen, TD Moy, AD Curran, MAJ Davies, S Bird, MI Munksgaard, NC Rootes, CM Millman, H Vohra, J Rivera, A Mackintosh, A Pike, J Hall, IR Bagshaw, EA Rainsley, E Bronk-Ramsey, C Montenari, M Cage, AG Harris, MRP Jones, R Power, A Love, J Young, J Weyrich, LS Cooper, A

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Publisher:: NATURE PUBLISHING GROUP
Publication Type:: Journal Article
Citation:: Nature Geoscience, 2020, 13, (7), pp. 489-497
Issue Date:: 2020-07-01

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Field	Value	Language
dc.contributor.author	Fogwill, CJ
dc.contributor.author	Turney, CSM
dc.contributor.author	Menviel, L
dc.contributor.author	Baker, A
dc.contributor.author	Weber, ME
dc.contributor.author	Ellis, B
dc.contributor.author	Thomas, ZA
dc.contributor.author	Golledge, NR
dc.contributor.author	Etheridge, D
dc.contributor.author	Rubino, M
dc.contributor.author	Thornton, DP
dc.contributor.author	van Ommen, TD
dc.contributor.author	Moy, AD
dc.contributor.author	Curran, MAJ
dc.contributor.author	Davies, S
dc.contributor.author	Bird, MI
dc.contributor.author	Munksgaard, NC
dc.contributor.author	Rootes, CM
dc.contributor.author	Millman, H
dc.contributor.author	Vohra, J
dc.contributor.author	Rivera, A
dc.contributor.author	Mackintosh, A
dc.contributor.author	Pike, J
dc.contributor.author	Hall, IR
dc.contributor.author	Bagshaw, EA
dc.contributor.author	Rainsley, E
dc.contributor.author	Bronk-Ramsey, C
dc.contributor.author	Montenari, M
dc.contributor.author	Cage, AG
dc.contributor.author	Harris, MRP
dc.contributor.author	Jones, R
dc.contributor.author	Power, A
dc.contributor.author	Love, J
dc.contributor.author	Young, J
dc.contributor.author	Weyrich, LS
dc.contributor.author	Cooper, A
dc.date.accessioned	2022-01-11T00:42:43Z
dc.date.available	2022-01-11T00:42:43Z
dc.date.issued	2020-07-01
dc.identifier.citation	Nature Geoscience, 2020, 13, (7), pp. 489-497
dc.identifier.issn	1752-0894
dc.identifier.issn	1752-0908
dc.identifier.uri	http://hdl.handle.net/10453/152890
dc.description.abstract	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.
dc.language	English
dc.publisher	NATURE PUBLISHING GROUP
dc.relation	http://purl.org/au-research/grants/arc/LP120200724
dc.relation.ispartof	Nature Geoscience
dc.relation.isbasedon	10.1038/s41561-020-0587-0
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Meteorology & Atmospheric Sciences
dc.title	Southern Ocean carbon sink enhanced by sea-ice feedbacks at the Antarctic Cold Reversal
dc.type	Journal Article
utslib.citation.volume	13
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/DVC (Research)
utslib.copyright.status	closed_access	*
dc.date.updated	2022-01-11T00:42:40Z
pubs.issue	7
pubs.publication-status	Published
pubs.volume	13
utslib.citation.issue	7

Abstract:

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.

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http://hdl.handle.net/10453/152890