Figure 5. Trace metal analysis of sediment core PS1506-1
An increase in whole ocean alkalinity during glacial periods could account, in part, for the drawdown of atmospheric CO2 into the ocean. Such an increase was inevitable due to the near elimination of shelf area for the burial of coral reef alkalinity. We present evidence, based on down-core measurem...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.728597 2023-05-15T18:25:51+02:00 Figure 5. Trace metal analysis of sediment core PS1506-1 Rickaby, Rosalind E M Elderfield, Henry Roberts, Natalie L Hillenbrand, Claus-Dieter Mackensen, Andreas LATITUDE: -68.732500 * LONGITUDE: -5.849660 * DATE/TIME START: 1987-03-02T12:10:00 * DATE/TIME END: 1987-03-02T12:10:00 * MINIMUM DEPTH, sediment/rock: 0.51 m * MAXIMUM DEPTH, sediment/rock: 7.32 m 2009-10-15 text/tab-separated-values, 148 data points https://doi.pangaea.de/10.1594/PANGAEA.728597 https://doi.org/10.1594/PANGAEA.728597 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.728597 https://doi.org/10.1594/PANGAEA.728597 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Rickaby, Rosalind E M; Elderfield, Henry; Roberts, Natalie L; Hillenbrand, Claus-Dieter; Mackensen, Andreas (2010): Evidence for elevated alkalinity in the glacial Southern Ocean. Paleoceanography, 25(1), PA1209, https://doi.org/10.1029/2009PA001762 AGE ANT-V/4 Boron/Calcium ratio DEPTH sediment/rock Eastern Weddell Sea Southern Ocean Gravity corer (Kiel type) Inductively coupled plasma - mass spectrometry (ICP-MS) Magnesium/Calcium ratio Polarstern PS10 PS10/816 PS1506-1 SL Dataset 2009 ftpangaea https://doi.org/10.1594/PANGAEA.728597 https://doi.org/10.1029/2009PA001762 2023-01-20T08:49:28Z An increase in whole ocean alkalinity during glacial periods could account, in part, for the drawdown of atmospheric CO2 into the ocean. Such an increase was inevitable due to the near elimination of shelf area for the burial of coral reef alkalinity. We present evidence, based on down-core measurements of benthic foraminiferal B/Ca and Mg/Ca from a core in the Weddell Sea, that the deep ocean carbonate ion concentration, [CO3 2-], was elevated by ~25 µmol/kg during each glacial period of the last 800 kyrs. The heterogeneity of the preservation histories in the different ocean basins reflects control of the carbonate chemistry of the deep glacial ocean in the Atlantic and Pacific by the changing ventilation and chemistry of Weddell Sea waters. These waters are more corrosive than interglacial northern sourced waters, but not as undersaturated as interglacial southern sourced waters. Our inferred increase in whole ocean alkalinity can be reconciled with reconstructions of glacial saturation horizon depth and the carbonate budget, if carbonate burial rates also increased above the saturation horizon as a result of enhanced pelagic calcification. The Weddell records display low [CO3 2-] during deglaciations and peak interglacial warmth, coincident with maxima in %CaCO3 in the Atlantic and Pacific Oceans. Should the burial rate of alkalinity in the more alkaline glacial deepwaters outstrip the rate of alkalinity supply, then pelagic carbonate production by the coccolithophores, at the end of the glacial maximum could drive a decrease in ocean [CO3 2-] and act to trigger the deglacial rise in pCO2. Dataset Southern Ocean Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science Pacific Southern Ocean Weddell Weddell Sea ENVELOPE(-5.849660,-5.849660,-68.732500,-68.732500) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AGE ANT-V/4 Boron/Calcium ratio DEPTH sediment/rock Eastern Weddell Sea Southern Ocean Gravity corer (Kiel type) Inductively coupled plasma - mass spectrometry (ICP-MS) Magnesium/Calcium ratio Polarstern PS10 PS10/816 PS1506-1 SL |
spellingShingle |
AGE ANT-V/4 Boron/Calcium ratio DEPTH sediment/rock Eastern Weddell Sea Southern Ocean Gravity corer (Kiel type) Inductively coupled plasma - mass spectrometry (ICP-MS) Magnesium/Calcium ratio Polarstern PS10 PS10/816 PS1506-1 SL Rickaby, Rosalind E M Elderfield, Henry Roberts, Natalie L Hillenbrand, Claus-Dieter Mackensen, Andreas Figure 5. Trace metal analysis of sediment core PS1506-1 |
topic_facet |
AGE ANT-V/4 Boron/Calcium ratio DEPTH sediment/rock Eastern Weddell Sea Southern Ocean Gravity corer (Kiel type) Inductively coupled plasma - mass spectrometry (ICP-MS) Magnesium/Calcium ratio Polarstern PS10 PS10/816 PS1506-1 SL |
description |
An increase in whole ocean alkalinity during glacial periods could account, in part, for the drawdown of atmospheric CO2 into the ocean. Such an increase was inevitable due to the near elimination of shelf area for the burial of coral reef alkalinity. We present evidence, based on down-core measurements of benthic foraminiferal B/Ca and Mg/Ca from a core in the Weddell Sea, that the deep ocean carbonate ion concentration, [CO3 2-], was elevated by ~25 µmol/kg during each glacial period of the last 800 kyrs. The heterogeneity of the preservation histories in the different ocean basins reflects control of the carbonate chemistry of the deep glacial ocean in the Atlantic and Pacific by the changing ventilation and chemistry of Weddell Sea waters. These waters are more corrosive than interglacial northern sourced waters, but not as undersaturated as interglacial southern sourced waters. Our inferred increase in whole ocean alkalinity can be reconciled with reconstructions of glacial saturation horizon depth and the carbonate budget, if carbonate burial rates also increased above the saturation horizon as a result of enhanced pelagic calcification. The Weddell records display low [CO3 2-] during deglaciations and peak interglacial warmth, coincident with maxima in %CaCO3 in the Atlantic and Pacific Oceans. Should the burial rate of alkalinity in the more alkaline glacial deepwaters outstrip the rate of alkalinity supply, then pelagic carbonate production by the coccolithophores, at the end of the glacial maximum could drive a decrease in ocean [CO3 2-] and act to trigger the deglacial rise in pCO2. |
format |
Dataset |
author |
Rickaby, Rosalind E M Elderfield, Henry Roberts, Natalie L Hillenbrand, Claus-Dieter Mackensen, Andreas |
author_facet |
Rickaby, Rosalind E M Elderfield, Henry Roberts, Natalie L Hillenbrand, Claus-Dieter Mackensen, Andreas |
author_sort |
Rickaby, Rosalind E M |
title |
Figure 5. Trace metal analysis of sediment core PS1506-1 |
title_short |
Figure 5. Trace metal analysis of sediment core PS1506-1 |
title_full |
Figure 5. Trace metal analysis of sediment core PS1506-1 |
title_fullStr |
Figure 5. Trace metal analysis of sediment core PS1506-1 |
title_full_unstemmed |
Figure 5. Trace metal analysis of sediment core PS1506-1 |
title_sort |
figure 5. trace metal analysis of sediment core ps1506-1 |
publisher |
PANGAEA |
publishDate |
2009 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.728597 https://doi.org/10.1594/PANGAEA.728597 |
op_coverage |
LATITUDE: -68.732500 * LONGITUDE: -5.849660 * DATE/TIME START: 1987-03-02T12:10:00 * DATE/TIME END: 1987-03-02T12:10:00 * MINIMUM DEPTH, sediment/rock: 0.51 m * MAXIMUM DEPTH, sediment/rock: 7.32 m |
long_lat |
ENVELOPE(-5.849660,-5.849660,-68.732500,-68.732500) |
geographic |
Pacific Southern Ocean Weddell Weddell Sea |
geographic_facet |
Pacific Southern Ocean Weddell Weddell Sea |
genre |
Southern Ocean Weddell Sea |
genre_facet |
Southern Ocean Weddell Sea |
op_source |
Supplement to: Rickaby, Rosalind E M; Elderfield, Henry; Roberts, Natalie L; Hillenbrand, Claus-Dieter; Mackensen, Andreas (2010): Evidence for elevated alkalinity in the glacial Southern Ocean. Paleoceanography, 25(1), PA1209, https://doi.org/10.1029/2009PA001762 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.728597 https://doi.org/10.1594/PANGAEA.728597 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.728597 https://doi.org/10.1029/2009PA001762 |
_version_ |
1766207545183043584 |