Responses of the Deep Ocean Carbonate System to Carbon Reorganization During the Last Glacial-Interglacial Cycle
We present new deep water carbonate ion concentration ([CO3 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...
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ftdatacite:10.7916/d84f21wk 2023-05-15T17:37:00+02:00 Responses of the Deep Ocean Carbonate System to Carbon Reorganization During the Last Glacial-Interglacial Cycle Anderson, Robert F. Yu, Jimin Jin, Zhangdong Rae, James W. B. Opdyke, Bradley N. Eggins, Stephen M. 2013 https://dx.doi.org/10.7916/d84f21wk https://academiccommons.columbia.edu/doi/10.7916/D84F21WK unknown Columbia University https://dx.doi.org/10.1016/j.quascirev.2013.06.020 Chemical oceanography Text Articles article-journal ScholarlyArticle 2013 ftdatacite https://doi.org/10.7916/d84f21wk https://doi.org/10.1016/j.quascirev.2013.06.020 2021-11-05T12:55:41Z We present new deep water carbonate ion concentration ([CO3 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 [CO3 2-] in the Caribbean Basin roughly mirrors that of atmospheric CO2, reflecting a dominant influence from preformed [CO3 2-] in the North Atlantic Ocean. Compared to the amplitude of ~65 mol/kg in the deep Caribbean Basin, deep water [CO3 2-] in the equatorial Pacific Ocean has varied by no more than ~15 mol/kg due to effective buffering of CaCO3 on deep-sea pH in the Pacific Ocean. Our results suggest little change in the global mean deep ocean [CO3 2-] between the Last Glacial Maximum (LGM) and the Late Holocene. The three records from the Pacific Ocean show long-term increases in [CO3 2-] by ~7 mol/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 [CO3 2-] in the Pacific Ocean displays transient changes, which decouple with 13C in the same cores, at the start and end of MIS 4. These changes in [CO3 2-] and 13C are consistent with what would be expected from vertical nutrient fractionation and carbonate compensation. The observed ~4 mol/kg [CO3 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 CO2 drawdown during the last glaciation. The striking similarity between deep water [CO3 2-] and 230Th-normalized CaCO3 flux at two adjacent sites from the central equatorial Pacific Ocean provides convincing evidence that deep-sea carbonate dissolution dominantly controlled CaCO3 preservation at these sites in the past. Our results offer new a 70 nd quantitative constraints from deep ocean carbonate chemistry to understand roles of various mechanisms in atmospheric CO2 changes over the last glacial-interglacial cycle. Text North Atlantic DataCite Metadata Store (German National Library of Science and Technology) Pacific |
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topic |
Chemical oceanography |
spellingShingle |
Chemical oceanography Anderson, Robert F. Yu, Jimin 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 |
topic_facet |
Chemical oceanography |
description |
We present new deep water carbonate ion concentration ([CO3 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 [CO3 2-] in the Caribbean Basin roughly mirrors that of atmospheric CO2, reflecting a dominant influence from preformed [CO3 2-] in the North Atlantic Ocean. Compared to the amplitude of ~65 mol/kg in the deep Caribbean Basin, deep water [CO3 2-] in the equatorial Pacific Ocean has varied by no more than ~15 mol/kg due to effective buffering of CaCO3 on deep-sea pH in the Pacific Ocean. Our results suggest little change in the global mean deep ocean [CO3 2-] between the Last Glacial Maximum (LGM) and the Late Holocene. The three records from the Pacific Ocean show long-term increases in [CO3 2-] by ~7 mol/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 [CO3 2-] in the Pacific Ocean displays transient changes, which decouple with 13C in the same cores, at the start and end of MIS 4. These changes in [CO3 2-] and 13C are consistent with what would be expected from vertical nutrient fractionation and carbonate compensation. The observed ~4 mol/kg [CO3 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 CO2 drawdown during the last glaciation. The striking similarity between deep water [CO3 2-] and 230Th-normalized CaCO3 flux at two adjacent sites from the central equatorial Pacific Ocean provides convincing evidence that deep-sea carbonate dissolution dominantly controlled CaCO3 preservation at these sites in the past. Our results offer new a 70 nd quantitative constraints from deep ocean carbonate chemistry to understand roles of various mechanisms in atmospheric CO2 changes over the last glacial-interglacial cycle. |
format |
Text |
author |
Anderson, Robert F. Yu, Jimin Jin, Zhangdong Rae, James W. B. Opdyke, Bradley N. Eggins, Stephen M. |
author_facet |
Anderson, Robert F. Yu, Jimin Jin, Zhangdong Rae, James W. B. Opdyke, Bradley N. Eggins, Stephen M. |
author_sort |
Anderson, Robert F. |
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 |
Columbia University |
publishDate |
2013 |
url |
https://dx.doi.org/10.7916/d84f21wk https://academiccommons.columbia.edu/doi/10.7916/D84F21WK |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://dx.doi.org/10.1016/j.quascirev.2013.06.020 |
op_doi |
https://doi.org/10.7916/d84f21wk https://doi.org/10.1016/j.quascirev.2013.06.020 |
_version_ |
1766136688811180032 |