Responses of the deep ocean carbonate system to carbon reorganization during the Last Glacial–interglacial cycle
We present new deep water carbonate ion concentration ([CO_3^(2−)]) records, reconstructed using Cibicidoides wuellerstorfi B/Ca, for one core from Caribbean Basin (water depth = 3623 m, sill depth = 1.8 km) and three cores located at 2.3–4.3 km water depth from the equatorial Pacific Ocean during t...
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ftcaltechauth:oai:authors.library.caltech.edu:42001 2023-05-15T17:37:09+02:00 Responses of the deep ocean carbonate system to carbon reorganization during the Last Glacial–interglacial cycle Yu, Jimin Anderson, Robert F. Jin, Zhangdong Rae, James W. B. Opdyke, Bradley N. Eggins, Stephen M. 2013-09-15 application/msword application/vnd.ms-excel https://authors.library.caltech.edu/42001/ https://authors.library.caltech.edu/42001/7/mmc1.doc https://authors.library.caltech.edu/42001/8/mmc2.xls https://resolver.caltech.edu/CaltechAUTHORS:20131022-074259329 en eng Elsevier https://authors.library.caltech.edu/42001/7/mmc1.doc https://authors.library.caltech.edu/42001/8/mmc2.xls Yu, Jimin and Anderson, Robert F. and Jin, Zhangdong and Rae, James W. B. and Opdyke, Bradley N. and Eggins, Stephen M. (2013) Responses of the deep ocean carbonate system to carbon reorganization during the Last Glacial–interglacial cycle. Quaternary Science Reviews, 76 . pp. 39-52. ISSN 0277-3791. doi:10.1016/j.quascirev.2013.06.020. https://resolver.caltech.edu/CaltechAUTHORS:20131022-074259329 <https://resolver.caltech.edu/CaltechAUTHORS:20131022-074259329> other Article PeerReviewed 2013 ftcaltechauth https://doi.org/10.1016/j.quascirev.2013.06.020 2021-11-11T18:55:36Z We present new deep water carbonate ion concentration ([CO_3^(2−)]) records, reconstructed using Cibicidoides wuellerstorfi B/Ca, for one core from Caribbean Basin (water depth = 3623 m, sill depth = 1.8 km) and three cores located at 2.3–4.3 km water depth from the equatorial Pacific Ocean during the Last Glacial–interglacial cycle. The pattern of deep water [CO_3^(2−)] in the Caribbean Basin roughly mirrors that of atmospheric CO_2, reflecting a dominant influence from preformed [CO_3^(2−)] in the North Atlantic Ocean. Compared to the amplitude of ∼65 μmol/kg in the deep Caribbean Basin, deep water [CO_3^(2−)] in the equatorial Pacific Ocean has varied by no more than ∼15 μmol/kg due to effective buffering of CaCO_3 on deep-sea pH in the Pacific Ocean. Our results suggest little change in the global mean deep ocean [CO_3^(2−)] between the Last Glacial Maximum (LGM) and the Late Holocene. The three records from the Pacific Ocean show long-term increases in [CO_3^(2−)] by ∼7 μmol/kg from Marine Isotope Stage (MIS) 5c to mid MIS 3, consistent with the response of the deep ocean carbonate system to a decline in neritic carbonate production associated with ∼60 m drop in sea-level (the “coral-reef” hypothesis). Superimposed upon the long-term trend, deep water [CO_3^(2−)] in the Pacific Ocean displays transient changes, which decouple with δ^(13)C in the same cores, at the start and end of MIS 4. These changes in [CO_3^(2−)] and δ^(13)C are consistent with what would be expected from vertical nutrient fractionation and carbonate compensation. The observed ∼4 μmol/kg [CO_3^(2−)] decline in the two Pacific cores at >3.4 km water depth from MIS 3 to the LGM indicate further strengthening of deep ocean stratification, which contributed to the final step of atmospheric CO_2 drawdown during the last glaciation. The striking similarity between deep water [CO_3^(2−)] and ^(230)Th-normalized CaCO_3 flux at two adjacent sites from the central equatorial Pacific Ocean provides convincing evidence that deep-sea carbonate dissolution dominantly controlled CaCO_3 preservation at these sites in the past. Our results offer new and quantitative constraints from deep ocean carbonate chemistry to understand roles of various mechanisms in atmospheric CO_2 changes over the Last Glacial–interglacial cycle. Article in Journal/Newspaper North Atlantic Caltech Authors (California Institute of Technology) Pacific Quaternary Science Reviews 76 39 52 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
English |
description |
We present new deep water carbonate ion concentration ([CO_3^(2−)]) records, reconstructed using Cibicidoides wuellerstorfi B/Ca, for one core from Caribbean Basin (water depth = 3623 m, sill depth = 1.8 km) and three cores located at 2.3–4.3 km water depth from the equatorial Pacific Ocean during the Last Glacial–interglacial cycle. The pattern of deep water [CO_3^(2−)] in the Caribbean Basin roughly mirrors that of atmospheric CO_2, reflecting a dominant influence from preformed [CO_3^(2−)] in the North Atlantic Ocean. Compared to the amplitude of ∼65 μmol/kg in the deep Caribbean Basin, deep water [CO_3^(2−)] in the equatorial Pacific Ocean has varied by no more than ∼15 μmol/kg due to effective buffering of CaCO_3 on deep-sea pH in the Pacific Ocean. Our results suggest little change in the global mean deep ocean [CO_3^(2−)] between the Last Glacial Maximum (LGM) and the Late Holocene. The three records from the Pacific Ocean show long-term increases in [CO_3^(2−)] by ∼7 μmol/kg from Marine Isotope Stage (MIS) 5c to mid MIS 3, consistent with the response of the deep ocean carbonate system to a decline in neritic carbonate production associated with ∼60 m drop in sea-level (the “coral-reef” hypothesis). Superimposed upon the long-term trend, deep water [CO_3^(2−)] in the Pacific Ocean displays transient changes, which decouple with δ^(13)C in the same cores, at the start and end of MIS 4. These changes in [CO_3^(2−)] and δ^(13)C are consistent with what would be expected from vertical nutrient fractionation and carbonate compensation. The observed ∼4 μmol/kg [CO_3^(2−)] decline in the two Pacific cores at >3.4 km water depth from MIS 3 to the LGM indicate further strengthening of deep ocean stratification, which contributed to the final step of atmospheric CO_2 drawdown during the last glaciation. The striking similarity between deep water [CO_3^(2−)] and ^(230)Th-normalized CaCO_3 flux at two adjacent sites from the central equatorial Pacific Ocean provides convincing evidence that deep-sea carbonate dissolution dominantly controlled CaCO_3 preservation at these sites in the past. Our results offer new and quantitative constraints from deep ocean carbonate chemistry to understand roles of various mechanisms in atmospheric CO_2 changes over the Last Glacial–interglacial cycle. |
format |
Article in Journal/Newspaper |
author |
Yu, Jimin Anderson, Robert F. Jin, Zhangdong Rae, James W. B. Opdyke, Bradley N. Eggins, Stephen M. |
spellingShingle |
Yu, Jimin Anderson, Robert F. Jin, Zhangdong Rae, James W. B. Opdyke, Bradley N. Eggins, Stephen M. Responses of the deep ocean carbonate system to carbon reorganization during the Last Glacial–interglacial cycle |
author_facet |
Yu, Jimin Anderson, Robert F. Jin, Zhangdong Rae, James W. B. Opdyke, Bradley N. Eggins, Stephen M. |
author_sort |
Yu, Jimin |
title |
Responses of the deep ocean carbonate system to carbon reorganization during the Last Glacial–interglacial cycle |
title_short |
Responses of the deep ocean carbonate system to carbon reorganization during the Last Glacial–interglacial cycle |
title_full |
Responses of the deep ocean carbonate system to carbon reorganization during the Last Glacial–interglacial cycle |
title_fullStr |
Responses of the deep ocean carbonate system to carbon reorganization during the Last Glacial–interglacial cycle |
title_full_unstemmed |
Responses of the deep ocean carbonate system to carbon reorganization during the Last Glacial–interglacial cycle |
title_sort |
responses of the deep ocean carbonate system to carbon reorganization during the last glacial–interglacial cycle |
publisher |
Elsevier |
publishDate |
2013 |
url |
https://authors.library.caltech.edu/42001/ https://authors.library.caltech.edu/42001/7/mmc1.doc https://authors.library.caltech.edu/42001/8/mmc2.xls https://resolver.caltech.edu/CaltechAUTHORS:20131022-074259329 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://authors.library.caltech.edu/42001/7/mmc1.doc https://authors.library.caltech.edu/42001/8/mmc2.xls Yu, Jimin and Anderson, Robert F. and Jin, Zhangdong and Rae, James W. B. and Opdyke, Bradley N. and Eggins, Stephen M. (2013) Responses of the deep ocean carbonate system to carbon reorganization during the Last Glacial–interglacial cycle. Quaternary Science Reviews, 76 . pp. 39-52. ISSN 0277-3791. doi:10.1016/j.quascirev.2013.06.020. https://resolver.caltech.edu/CaltechAUTHORS:20131022-074259329 <https://resolver.caltech.edu/CaltechAUTHORS:20131022-074259329> |
op_rights |
other |
op_doi |
https://doi.org/10.1016/j.quascirev.2013.06.020 |
container_title |
Quaternary Science Reviews |
container_volume |
76 |
container_start_page |
39 |
op_container_end_page |
52 |
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1766136905591685120 |