Last glacial atmospheric CO(2)decline due to widespread Pacific deep-water expansion
Carbon-rich Pacific deep water extended into the South Atlantic some 38,000 to 28,000 years ago, potentially contributing to a reduction in atmospheric carbon dioxide and the onset of the Last Glacial Maximum, according to deep-water carbonate chemistry reconstructions. Ocean circulation critically...
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ftchinacascieeca:oai:ir.ieecas.cn:361006/15091 2023-06-11T04:14:49+02:00 Last glacial atmospheric CO(2)decline due to widespread Pacific deep-water expansion Yu, J. Menviel, L. Jin, Z. D. Anderson, R. F. Jian, Z. Piotrowski, A. M. Ma, X. Rohling, E. J. Zhang, F. Marino, G. McManus, J. F. 2020-07-20 http://ir.ieecas.cn/handle/361006/15091 https://doi.org/10.1038/s41561-020-0610-5 英语 eng NATURE PUBLISHING GROUP NATURE GEOSCIENCE http://ir.ieecas.cn/handle/361006/15091 doi:10.1038/s41561-020-0610-5 EASTERN EQUATORIAL PACIFIC SOUTHERN-OCEAN NORTH-ATLANTIC OVERTURNING CIRCULATION CARBON CO2 SEA SEQUESTRATION STRATIFICATION TEMPERATURE Geology Geosciences Multidisciplinary 期刊论文 2020 ftchinacascieeca https://doi.org/10.1038/s41561-020-0610-5 2023-05-08T13:24:53Z Carbon-rich Pacific deep water extended into the South Atlantic some 38,000 to 28,000 years ago, potentially contributing to a reduction in atmospheric carbon dioxide and the onset of the Last Glacial Maximum, according to deep-water carbonate chemistry reconstructions. Ocean circulation critically affects the global climate and atmospheric carbon dioxide through redistribution of heat and carbon in the Earth system. Despite intensive research, the nature of past ocean circulation changes remains elusive. Here we present deep-water carbonate ion concentration reconstructions for widely distributed locations in the Atlantic Ocean, where low carbonate ion concentrations indicate carbon-rich waters. These data show a low-carbonate-ion water mass that extended northward up to about 20 degrees S in the South Atlantic at 3-4 km depth during the Last Glacial Maximum. In combination with radiocarbon ages, neodymium isotopes and carbon isotopes, we conclude that this low-carbonate-ion signal reflects a widespread expansion of carbon-rich Pacific deep waters into the South Atlantic, revealing a glacial deep Atlantic circulation scheme different than commonly considered. Comparison of high-resolution carbonate ion records from different water depths in the South Atlantic indicates that this Pacific deep-water expansion developed from approximately 38,000 to 28,000 years ago. We infer that its associated carbon sequestration may have contributed critically to the contemporaneous decline in atmospheric carbon dioxide, thereby helping to initiate the glacial maximum. Report North Atlantic Southern Ocean Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) Pacific Southern Ocean Nature Geoscience 13 9 628 633 |
institution |
Open Polar |
collection |
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacascieeca |
language |
English |
topic |
EASTERN EQUATORIAL PACIFIC SOUTHERN-OCEAN NORTH-ATLANTIC OVERTURNING CIRCULATION CARBON CO2 SEA SEQUESTRATION STRATIFICATION TEMPERATURE Geology Geosciences Multidisciplinary |
spellingShingle |
EASTERN EQUATORIAL PACIFIC SOUTHERN-OCEAN NORTH-ATLANTIC OVERTURNING CIRCULATION CARBON CO2 SEA SEQUESTRATION STRATIFICATION TEMPERATURE Geology Geosciences Multidisciplinary Yu, J. Menviel, L. Jin, Z. D. Anderson, R. F. Jian, Z. Piotrowski, A. M. Ma, X. Rohling, E. J. Zhang, F. Marino, G. McManus, J. F. Last glacial atmospheric CO(2)decline due to widespread Pacific deep-water expansion |
topic_facet |
EASTERN EQUATORIAL PACIFIC SOUTHERN-OCEAN NORTH-ATLANTIC OVERTURNING CIRCULATION CARBON CO2 SEA SEQUESTRATION STRATIFICATION TEMPERATURE Geology Geosciences Multidisciplinary |
description |
Carbon-rich Pacific deep water extended into the South Atlantic some 38,000 to 28,000 years ago, potentially contributing to a reduction in atmospheric carbon dioxide and the onset of the Last Glacial Maximum, according to deep-water carbonate chemistry reconstructions. Ocean circulation critically affects the global climate and atmospheric carbon dioxide through redistribution of heat and carbon in the Earth system. Despite intensive research, the nature of past ocean circulation changes remains elusive. Here we present deep-water carbonate ion concentration reconstructions for widely distributed locations in the Atlantic Ocean, where low carbonate ion concentrations indicate carbon-rich waters. These data show a low-carbonate-ion water mass that extended northward up to about 20 degrees S in the South Atlantic at 3-4 km depth during the Last Glacial Maximum. In combination with radiocarbon ages, neodymium isotopes and carbon isotopes, we conclude that this low-carbonate-ion signal reflects a widespread expansion of carbon-rich Pacific deep waters into the South Atlantic, revealing a glacial deep Atlantic circulation scheme different than commonly considered. Comparison of high-resolution carbonate ion records from different water depths in the South Atlantic indicates that this Pacific deep-water expansion developed from approximately 38,000 to 28,000 years ago. We infer that its associated carbon sequestration may have contributed critically to the contemporaneous decline in atmospheric carbon dioxide, thereby helping to initiate the glacial maximum. |
format |
Report |
author |
Yu, J. Menviel, L. Jin, Z. D. Anderson, R. F. Jian, Z. Piotrowski, A. M. Ma, X. Rohling, E. J. Zhang, F. Marino, G. McManus, J. F. |
author_facet |
Yu, J. Menviel, L. Jin, Z. D. Anderson, R. F. Jian, Z. Piotrowski, A. M. Ma, X. Rohling, E. J. Zhang, F. Marino, G. McManus, J. F. |
author_sort |
Yu, J. |
title |
Last glacial atmospheric CO(2)decline due to widespread Pacific deep-water expansion |
title_short |
Last glacial atmospheric CO(2)decline due to widespread Pacific deep-water expansion |
title_full |
Last glacial atmospheric CO(2)decline due to widespread Pacific deep-water expansion |
title_fullStr |
Last glacial atmospheric CO(2)decline due to widespread Pacific deep-water expansion |
title_full_unstemmed |
Last glacial atmospheric CO(2)decline due to widespread Pacific deep-water expansion |
title_sort |
last glacial atmospheric co(2)decline due to widespread pacific deep-water expansion |
publisher |
NATURE PUBLISHING GROUP |
publishDate |
2020 |
url |
http://ir.ieecas.cn/handle/361006/15091 https://doi.org/10.1038/s41561-020-0610-5 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_relation |
NATURE GEOSCIENCE http://ir.ieecas.cn/handle/361006/15091 doi:10.1038/s41561-020-0610-5 |
op_doi |
https://doi.org/10.1038/s41561-020-0610-5 |
container_title |
Nature Geoscience |
container_volume |
13 |
container_issue |
9 |
container_start_page |
628 |
op_container_end_page |
633 |
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1768371133560651776 |