Sequestration of carbon in the deep Atlantic during the last glaciation
Atmospheric CO2 concentrations declined markedly about 70,000 years ago, when the Earth's climate descended into the last glaciation. Much of the carbon removed from the atmosphere has been suspected to have entered the deep oceans, but evidence for increased carbon storage remains elusive. Her...
Published in: | Nature Geoscience |
---|---|
Main Authors: | , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2016
|
Subjects: | |
Online Access: | http://ir.ieecas.cn/handle/361006/5755 https://doi.org/10.1038/NGEO2657 |
id |
ftchinacascieeca:oai:ir.ieecas.cn:361006/5755 |
---|---|
record_format |
openpolar |
spelling |
ftchinacascieeca:oai:ir.ieecas.cn:361006/5755 2023-06-11T04:17:02+02:00 Sequestration of carbon in the deep Atlantic during the last glaciation Yu, J. Menviel, L. Jin, Z. D. Thornalley, D. J. R. Barker, S. Marino, G. Rohling, E. J. Cai, Y. Zhang, F. Wang, X. Dai, Y. Chen, P. Broecker, W. S. 2016-04-01 http://ir.ieecas.cn/handle/361006/5755 https://doi.org/10.1038/NGEO2657 英语 eng NATURE GEOSCIENCE http://ir.ieecas.cn/handle/361006/5755 doi:10.1038/NGEO2657 Science & Technology Physical Sciences OCEAN CIRCULATION ATMOSPHERIC CO2 LATE QUATERNARY EQUATORIAL PACIFIC INTERGLACIAL CYCLE WATER COMPOSITION SOUTHERN-OCEAN B/CA RATIOS ICE VOLUME BOTTOM Geology Geosciences Multidisciplinary Article 期刊论文 2016 ftchinacascieeca https://doi.org/10.1038/NGEO2657 2023-05-08T13:23:00Z Atmospheric CO2 concentrations declined markedly about 70,000 years ago, when the Earth's climate descended into the last glaciation. Much of the carbon removed from the atmosphere has been suspected to have entered the deep oceans, but evidence for increased carbon storage remains elusive. Here we use the B/Ca ratios of benthic foraminifera from several sites across the Atlantic Ocean to reconstruct changes in the carbonate ion concentration and hence the carbon inventory of the deep Atlantic across this transition. We find that deep Atlantic carbonate ion concentration declined by around 25 mu mol kg(-1) between similar to 80,000 and 65,000 years ago. This drop implies that the deep Atlantic carbon inventory increased by at least 50 Gt around the same time as the amount of atmospheric carbon dropped by about 60 Gt. From a comparison with proxy records of deep circulation and climate model simulations, we infer that the carbon sequestration coincided with a shoaling of the Atlantic meridional overturning circulation. We thus conclude that changes in the Atlantic Ocean circulation may have played an important role in reductions of atmospheric CO2 concentrations during the last glaciation, by increasing the carbon storage in the deep Atlantic. Article in Journal/Newspaper Southern Ocean Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) Pacific Southern Ocean Nature Geoscience 9 4 319 324 |
institution |
Open Polar |
collection |
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacascieeca |
language |
English |
topic |
Science & Technology Physical Sciences OCEAN CIRCULATION ATMOSPHERIC CO2 LATE QUATERNARY EQUATORIAL PACIFIC INTERGLACIAL CYCLE WATER COMPOSITION SOUTHERN-OCEAN B/CA RATIOS ICE VOLUME BOTTOM Geology Geosciences Multidisciplinary |
spellingShingle |
Science & Technology Physical Sciences OCEAN CIRCULATION ATMOSPHERIC CO2 LATE QUATERNARY EQUATORIAL PACIFIC INTERGLACIAL CYCLE WATER COMPOSITION SOUTHERN-OCEAN B/CA RATIOS ICE VOLUME BOTTOM Geology Geosciences Multidisciplinary Yu, J. Menviel, L. Jin, Z. D. Thornalley, D. J. R. Barker, S. Marino, G. Rohling, E. J. Cai, Y. Zhang, F. Wang, X. Dai, Y. Chen, P. Broecker, W. S. Sequestration of carbon in the deep Atlantic during the last glaciation |
topic_facet |
Science & Technology Physical Sciences OCEAN CIRCULATION ATMOSPHERIC CO2 LATE QUATERNARY EQUATORIAL PACIFIC INTERGLACIAL CYCLE WATER COMPOSITION SOUTHERN-OCEAN B/CA RATIOS ICE VOLUME BOTTOM Geology Geosciences Multidisciplinary |
description |
Atmospheric CO2 concentrations declined markedly about 70,000 years ago, when the Earth's climate descended into the last glaciation. Much of the carbon removed from the atmosphere has been suspected to have entered the deep oceans, but evidence for increased carbon storage remains elusive. Here we use the B/Ca ratios of benthic foraminifera from several sites across the Atlantic Ocean to reconstruct changes in the carbonate ion concentration and hence the carbon inventory of the deep Atlantic across this transition. We find that deep Atlantic carbonate ion concentration declined by around 25 mu mol kg(-1) between similar to 80,000 and 65,000 years ago. This drop implies that the deep Atlantic carbon inventory increased by at least 50 Gt around the same time as the amount of atmospheric carbon dropped by about 60 Gt. From a comparison with proxy records of deep circulation and climate model simulations, we infer that the carbon sequestration coincided with a shoaling of the Atlantic meridional overturning circulation. We thus conclude that changes in the Atlantic Ocean circulation may have played an important role in reductions of atmospheric CO2 concentrations during the last glaciation, by increasing the carbon storage in the deep Atlantic. |
format |
Article in Journal/Newspaper |
author |
Yu, J. Menviel, L. Jin, Z. D. Thornalley, D. J. R. Barker, S. Marino, G. Rohling, E. J. Cai, Y. Zhang, F. Wang, X. Dai, Y. Chen, P. Broecker, W. S. |
author_facet |
Yu, J. Menviel, L. Jin, Z. D. Thornalley, D. J. R. Barker, S. Marino, G. Rohling, E. J. Cai, Y. Zhang, F. Wang, X. Dai, Y. Chen, P. Broecker, W. S. |
author_sort |
Yu, J. |
title |
Sequestration of carbon in the deep Atlantic during the last glaciation |
title_short |
Sequestration of carbon in the deep Atlantic during the last glaciation |
title_full |
Sequestration of carbon in the deep Atlantic during the last glaciation |
title_fullStr |
Sequestration of carbon in the deep Atlantic during the last glaciation |
title_full_unstemmed |
Sequestration of carbon in the deep Atlantic during the last glaciation |
title_sort |
sequestration of carbon in the deep atlantic during the last glaciation |
publishDate |
2016 |
url |
http://ir.ieecas.cn/handle/361006/5755 https://doi.org/10.1038/NGEO2657 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
NATURE GEOSCIENCE http://ir.ieecas.cn/handle/361006/5755 doi:10.1038/NGEO2657 |
op_doi |
https://doi.org/10.1038/NGEO2657 |
container_title |
Nature Geoscience |
container_volume |
9 |
container_issue |
4 |
container_start_page |
319 |
op_container_end_page |
324 |
_version_ |
1768375811504603136 |