Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Sierra Leone Rise, supplement to: Curry, William B; Lohmann, G P (1983): Reduced advection into Atlantic Ocean deep eastern basins during last glaciation maximum. Nature, 306, 577-580
Causes of change in deep water delta13C can be either global or local in extent. Global causes include (1) climatically-induced changes in the amount of terrestrial biomass which alter the average carbon isotopic composition of the oceanic reservoir (Shackleton, 1977), and (2) erosion and deposition...
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ftdatacite:10.1594/pangaea.726021 2023-05-15T17:37:09+02:00 Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Sierra Leone Rise, supplement to: Curry, William B; Lohmann, G P (1983): Reduced advection into Atlantic Ocean deep eastern basins during last glaciation maximum. Nature, 306, 577-580 Curry, William B Lohmann, G P 1983 application/zip https://dx.doi.org/10.1594/pangaea.726021 https://doi.pangaea.de/10.1594/PANGAEA.726021 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1038/306577a0 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Gravity corer EN06601 Endeavor article Supplementary Collection of Datasets Collection 1983 ftdatacite https://doi.org/10.1594/pangaea.726021 https://doi.org/10.1038/306577a0 2022-02-09T13:17:17Z Causes of change in deep water delta13C can be either global or local in extent. Global causes include (1) climatically-induced changes in the amount of terrestrial biomass which alter the average carbon isotopic composition of the oceanic reservoir (Shackleton, 1977), and (2) erosion and deposition of organic-rich, continental shelf sediments during sea level fluctuations which change the mean oceanic carbon: phosphorus ratio (Broecker, 1982 doi:10.1016/0079-6611(82)90007-6). Regional gradients of delta13C are created by remineralization of organic detritus within the deep ocean itself thus reflecting the distribution of water masses and modern thermohaline flow. Changes in a single geological record of benthic foraminiferal delta13C can result from any combination of these global and abyssal circulation effects. By sampling a large number of cores collected over a wide bathymetric range yet confined to a small geographical region we have minimized the ambiguity. We can assume that each delta13C record was equally affected by global causes of delta13C variation. The differences seen between the delta13C records must, therefore, reflect changes in the distribution of delta13C in the deep ocean. We interpret these differences in distribution in terms of changes in the ocean's abyssal circulation. Benthic foraminiferal carbon isotopic evidence from a suite of Sierra Leone Rise cores indicates that the deeper parts of the eastern Atlantic basins underwent a reduction in [O2] during the maximum of the last glaciation. Reduced advection of O2-rich deep water through low-latitude fracture zones, associated with increased delivery of organic matter to the deep ocean, lowered the delta13C of deep water SumCO2 at all depths below the sill separating the eastern and western Atlantic basins (Metcalf et al., 1964 doi:10.1016/0011-7471(64)91078-2). This decreased advection into the eastern Atlantic Ocean coincides with the overall decrease in deep water production in the North Atlantic during the last glacial maximum (Curry and Lohmann, 1982 doi:10.1016/0033-5894(82)90071-0; Boyle and Keigwin, 1982 doi:10.1126/science.218.4574.784; Schnitker, 1979 doi:10.1016/0377-8398(79)90020-3; Streeter and Shackleton, 1979 doi:10.1126/science.203.4376.168). Article in Journal/Newspaper North Atlantic DataCite Metadata Store (German National Library of Science and Technology) Shackleton |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Gravity corer EN06601 Endeavor |
spellingShingle |
Gravity corer EN06601 Endeavor Curry, William B Lohmann, G P Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Sierra Leone Rise, supplement to: Curry, William B; Lohmann, G P (1983): Reduced advection into Atlantic Ocean deep eastern basins during last glaciation maximum. Nature, 306, 577-580 |
topic_facet |
Gravity corer EN06601 Endeavor |
description |
Causes of change in deep water delta13C can be either global or local in extent. Global causes include (1) climatically-induced changes in the amount of terrestrial biomass which alter the average carbon isotopic composition of the oceanic reservoir (Shackleton, 1977), and (2) erosion and deposition of organic-rich, continental shelf sediments during sea level fluctuations which change the mean oceanic carbon: phosphorus ratio (Broecker, 1982 doi:10.1016/0079-6611(82)90007-6). Regional gradients of delta13C are created by remineralization of organic detritus within the deep ocean itself thus reflecting the distribution of water masses and modern thermohaline flow. Changes in a single geological record of benthic foraminiferal delta13C can result from any combination of these global and abyssal circulation effects. By sampling a large number of cores collected over a wide bathymetric range yet confined to a small geographical region we have minimized the ambiguity. We can assume that each delta13C record was equally affected by global causes of delta13C variation. The differences seen between the delta13C records must, therefore, reflect changes in the distribution of delta13C in the deep ocean. We interpret these differences in distribution in terms of changes in the ocean's abyssal circulation. Benthic foraminiferal carbon isotopic evidence from a suite of Sierra Leone Rise cores indicates that the deeper parts of the eastern Atlantic basins underwent a reduction in [O2] during the maximum of the last glaciation. Reduced advection of O2-rich deep water through low-latitude fracture zones, associated with increased delivery of organic matter to the deep ocean, lowered the delta13C of deep water SumCO2 at all depths below the sill separating the eastern and western Atlantic basins (Metcalf et al., 1964 doi:10.1016/0011-7471(64)91078-2). This decreased advection into the eastern Atlantic Ocean coincides with the overall decrease in deep water production in the North Atlantic during the last glacial maximum (Curry and Lohmann, 1982 doi:10.1016/0033-5894(82)90071-0; Boyle and Keigwin, 1982 doi:10.1126/science.218.4574.784; Schnitker, 1979 doi:10.1016/0377-8398(79)90020-3; Streeter and Shackleton, 1979 doi:10.1126/science.203.4376.168). |
format |
Article in Journal/Newspaper |
author |
Curry, William B Lohmann, G P |
author_facet |
Curry, William B Lohmann, G P |
author_sort |
Curry, William B |
title |
Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Sierra Leone Rise, supplement to: Curry, William B; Lohmann, G P (1983): Reduced advection into Atlantic Ocean deep eastern basins during last glaciation maximum. Nature, 306, 577-580 |
title_short |
Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Sierra Leone Rise, supplement to: Curry, William B; Lohmann, G P (1983): Reduced advection into Atlantic Ocean deep eastern basins during last glaciation maximum. Nature, 306, 577-580 |
title_full |
Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Sierra Leone Rise, supplement to: Curry, William B; Lohmann, G P (1983): Reduced advection into Atlantic Ocean deep eastern basins during last glaciation maximum. Nature, 306, 577-580 |
title_fullStr |
Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Sierra Leone Rise, supplement to: Curry, William B; Lohmann, G P (1983): Reduced advection into Atlantic Ocean deep eastern basins during last glaciation maximum. Nature, 306, 577-580 |
title_full_unstemmed |
Stable carbon and oxygen isotope ratios of Planulina wuellerstorfi from sediments of the Sierra Leone Rise, supplement to: Curry, William B; Lohmann, G P (1983): Reduced advection into Atlantic Ocean deep eastern basins during last glaciation maximum. Nature, 306, 577-580 |
title_sort |
stable carbon and oxygen isotope ratios of planulina wuellerstorfi from sediments of the sierra leone rise, supplement to: curry, william b; lohmann, g p (1983): reduced advection into atlantic ocean deep eastern basins during last glaciation maximum. nature, 306, 577-580 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1983 |
url |
https://dx.doi.org/10.1594/pangaea.726021 https://doi.pangaea.de/10.1594/PANGAEA.726021 |
geographic |
Shackleton |
geographic_facet |
Shackleton |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://dx.doi.org/10.1038/306577a0 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.726021 https://doi.org/10.1038/306577a0 |
_version_ |
1766136911181643776 |