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More efficient North Atlantic carbon pump during the Last Glacial Maximum

More efficient North Atlantic carbon pump during the Last Glacial Maximum
More efficient North Atlantic carbon pump during the Last Glacial Maximum
During the Last Glacial Maximum (LGM; ~20,000 years ago), the global ocean sequestered a large amount of carbon lost from the atmosphere and terrestrial biosphere. Suppressed CO2 outgassing from the Southern Ocean is the prevailing explanation for this carbon sequestration. By contrast, the North Atlantic Ocean—a major conduit for atmospheric CO2 transport to the ocean interior via the overturning circulation—has received much less attention. Here we demonstrate that North Atlantic carbon pump efficiency during the LGM was almost doubled relative to the Holocene. This is based on a novel proxy approach to estimate air–sea CO2 exchange signals using combined carbonate ion and nutrient reconstructions for multiple sediment cores from the North Atlantic. Our data indicate that in tandem with Southern Ocean processes, enhanced North Atlantic CO2 absorption contributed to lowering ice-age atmospheric CO2.
2041-1723
Yu, J.
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Menviel, L.
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Jin, Z. D.
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Thornalley, D. J. R.
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Foster, G. L.
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Rohling, E. J.
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Mccave, I. N.
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Mcmanus, J. F.
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Dai, Y.
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Ren, H.
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He, F.
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Zhang, F.
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Chen, P. J.
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Roberts, A. P.
1998d4e6-27ff-4dc9-9da2-e6d77656f53a
Yu, J.
f0cc5bca-6305-4361-9b00-67975b8a1d2e
Menviel, L.
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Jin, Z. D.
25770bfb-3d26-41ee-93d2-38e4667d19ab
Thornalley, D. J. R.
3dade064-b9a0-4fe8-9cc0-e6d1850f691f
Foster, G. L.
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Rohling, E. J.
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Mccave, I. N.
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Mcmanus, J. F.
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Dai, Y.
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Ren, H.
6b65b8c6-f19c-4bf1-a80b-c0e06601f716
He, F.
58d94605-5c23-423a-a53a-a833dd3bd315
Zhang, F.
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Chen, P. J.
b655ec57-a7ff-4c9e-8838-9e96de1d0297
Roberts, A. P.
1998d4e6-27ff-4dc9-9da2-e6d77656f53a

Yu, J., Menviel, L., Jin, Z. D., Thornalley, D. J. R., Foster, G. L., Rohling, E. J., Mccave, I. N., Mcmanus, J. F., Dai, Y., Ren, H., He, F., Zhang, F., Chen, P. J. and Roberts, A. P. (2019) More efficient North Atlantic carbon pump during the Last Glacial Maximum. Nature Communications, 10 (1). (doi:10.1038/s41467-019-10028-z).

Record type: Article

Abstract

During the Last Glacial Maximum (LGM; ~20,000 years ago), the global ocean sequestered a large amount of carbon lost from the atmosphere and terrestrial biosphere. Suppressed CO2 outgassing from the Southern Ocean is the prevailing explanation for this carbon sequestration. By contrast, the North Atlantic Ocean—a major conduit for atmospheric CO2 transport to the ocean interior via the overturning circulation—has received much less attention. Here we demonstrate that North Atlantic carbon pump efficiency during the LGM was almost doubled relative to the Holocene. This is based on a novel proxy approach to estimate air–sea CO2 exchange signals using combined carbonate ion and nutrient reconstructions for multiple sediment cores from the North Atlantic. Our data indicate that in tandem with Southern Ocean processes, enhanced North Atlantic CO2 absorption contributed to lowering ice-age atmospheric CO2.

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Accepted/In Press date: 12 April 2019
Published date: 15 May 2019

Identifiers

Local EPrints ID: 431131
URI: https://eprints.soton.ac.uk/id/eprint/431131
ISSN: 2041-1723
PURE UUID: b337c97a-d5cf-492f-b0c6-49c8fe685074
ORCID for G. L. Foster: ORCID iD orcid.org/0000-0003-3688-9668
ORCID for E. J. Rohling: ORCID iD orcid.org/0000-0001-5349-2158

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Date deposited: 24 May 2019 16:30
Last modified: 27 Aug 2019 00:38

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Contributors

Author: J. Yu
Author: L. Menviel
Author: Z. D. Jin
Author: D. J. R. Thornalley
Author: G. L. Foster ORCID iD
Author: E. J. Rohling ORCID iD
Author: I. N. Mccave
Author: J. F. Mcmanus
Author: Y. Dai
Author: H. Ren
Author: F. He
Author: F. Zhang
Author: P. J. Chen
Author: A. P. Roberts

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