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More efficient North Atlantic carbon pump during the Last Glacial Maximum

Yu, Jimin ; Menviel, L. ; Jin, Z. D. ; Thornalley, D. J.R. ; Foster, G. L. ; Rohling, E. J. ; McCave, I. N. ; McManus, J. F. ; Dai, Yuhao LU and Ren, H. , et al. (2019) In Nature Communications 10(1).
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... (More)

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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type
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publication status
published
subject
in
Nature Communications
volume
10
issue
1
article number
2170
publisher
Nature Publishing Group
external identifiers
  • pmid:31092826
  • scopus:85065790639
ISSN
2041-1723
DOI
10.1038/s41467-019-10028-z
language
English
LU publication?
no
id
d5f095b7-b916-4dfe-b220-4e4a53be4264
date added to LUP
2019-10-29 11:05:46
date last changed
2019-12-02 14:14:43
@article{d5f095b7-b916-4dfe-b220-4e4a53be4264,
  abstract     = {<p>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 CO<sub>2</sub> outgassing from the Southern Ocean is the prevailing explanation for this carbon sequestration. By contrast, the North Atlantic Ocean—a major conduit for atmospheric CO<sub>2</sub> 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 CO<sub>2</sub> 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 CO<sub>2</sub> absorption contributed to lowering ice-age atmospheric CO<sub>2</sub>.</p>},
  author       = {Yu, Jimin and Menviel, L. and Jin, Z. D. and Thornalley, D. J.R. and Foster, G. L. and Rohling, E. J. and McCave, I. N. and McManus, J. F. and Dai, Yuhao and Ren, H. and He, F. and Zhang, F. and Chen, P. J. and Roberts, A. P.},
  issn         = {2041-1723},
  language     = {eng},
  month        = {05},
  number       = {1},
  publisher    = {Nature Publishing Group},
  series       = {Nature Communications},
  title        = {More efficient North Atlantic carbon pump during the Last Glacial Maximum},
  url          = {http://dx.doi.org/10.1038/s41467-019-10028-z},
  doi          = {10.1038/s41467-019-10028-z},
  volume       = {10},
  year         = {2019},
}