Calibration and application of B/Ca, Cd/Ca, and d11B in Neogloboquadrina pachyderma (sinistral)
The North Atlantic and Norwegian Sea are prominent sinks of atmospheric CO2 today, but their roles in the past remain poorly constrained. In this study, we attempt to use B/Ca and d11B ratios in the planktonic foraminifera Neogloboquadrina pachyderma (sinistral variety) to reconstruct subsurface wat...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.821825 2023-05-15T16:49:38+02:00 Calibration and application of B/Ca, Cd/Ca, and d11B in Neogloboquadrina pachyderma (sinistral) Yu, Jimin Thornalley, David JR Rae, James W B McCave, I Nick MEDIAN LATITUDE: 60.419404 * MEDIAN LONGITUDE: -9.154811 * SOUTH-BOUND LATITUDE: 50.710000 * WEST-BOUND LONGITUDE: -52.952000 * NORTH-BOUND LATITUDE: 63.760000 * EAST-BOUND LONGITUDE: 52.950000 2013-11-06 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.821825 https://doi.org/10.1594/PANGAEA.821825 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.821825 https://doi.org/10.1594/PANGAEA.821825 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Yu, Jimin; Thornalley, David JR; Rae, James W B; McCave, I Nick (2013): Calibration and application of B/Ca, Cd/Ca, and d11B in Neogloboquadrina pachyderma (sinistral) to constrain CO2 uptake in the subpolar North Atlantic during the last deglaciation. Paleoceanography, 28(2), 237-252, https://doi.org/10.1002/palo.20024 Dataset 2013 ftpangaea https://doi.org/10.1594/PANGAEA.821825 https://doi.org/10.1002/palo.20024 2023-01-20T07:33:10Z The North Atlantic and Norwegian Sea are prominent sinks of atmospheric CO2 today, but their roles in the past remain poorly constrained. In this study, we attempt to use B/Ca and d11B ratios in the planktonic foraminifera Neogloboquadrina pachyderma (sinistral variety) to reconstruct subsurface water pH and pCO2 changes in the polar North Atlantic during the last deglaciation. Comparison of core-top results with nearby hydrographic data shows that B/Ca in N. pachyderma (s) is mainly controlled by seawater [B(OH)4]-/[HCO3]- with a roughly constant partition coefficient (KD =([B/Ca]of CaCO3)/([B(OH)4]-/[HCO3]-)of seawater) of 1.48 ± 0.15 * 10**-3 (2sigma), and d11B in this species is offset below d11B of the borate in seawater by 3.38 ± 0.71 per mil (2sigma). These values represent our best estimates with the sparse available hydrographic data close to our core-tops. More culturing and sediment trap work is needed to improve our understanding of boron incorporation into N. pachyderma (s). Application of a constant KD of 1.48 * 10**-3 to high resolution N. pachyderma (s) B/Ca records from two adjacent cores off Iceland shows that subsurface pCO2 at the habitat depth of N. pachyderma (s) (~50 m) generally followed the atmospheric CO2 trend but with negative offsets of ~10-50 ppmv during 19-10 ka. These B/Ca-based reconstructions are supported by independent estimates from low-resolution d11B measurements in the same cores. We also calibrate and apply Cd/Ca in N. pachyderma (s) to reconstruct nutrient levels for the same down cores. Like today's North Atlantic, past subsurface pCO2 variability off Iceland was significantly correlated with nutrient changes that might be linked to surface nutrient utilization and mixing within the upper water column. Because surface pCO2 (at 0 m water depth) is always lower than at deeper depths and if the application of a constant KD is valid, our results suggest that the polar North Atlantic has remained a CO2 sink during the calcification seasons of N. pachyderma (s) over the last ... Dataset Iceland Neogloboquadrina pachyderma North Atlantic Norwegian Sea Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science Norwegian Sea ENVELOPE(-52.952000,52.950000,63.760000,50.710000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
The North Atlantic and Norwegian Sea are prominent sinks of atmospheric CO2 today, but their roles in the past remain poorly constrained. In this study, we attempt to use B/Ca and d11B ratios in the planktonic foraminifera Neogloboquadrina pachyderma (sinistral variety) to reconstruct subsurface water pH and pCO2 changes in the polar North Atlantic during the last deglaciation. Comparison of core-top results with nearby hydrographic data shows that B/Ca in N. pachyderma (s) is mainly controlled by seawater [B(OH)4]-/[HCO3]- with a roughly constant partition coefficient (KD =([B/Ca]of CaCO3)/([B(OH)4]-/[HCO3]-)of seawater) of 1.48 ± 0.15 * 10**-3 (2sigma), and d11B in this species is offset below d11B of the borate in seawater by 3.38 ± 0.71 per mil (2sigma). These values represent our best estimates with the sparse available hydrographic data close to our core-tops. More culturing and sediment trap work is needed to improve our understanding of boron incorporation into N. pachyderma (s). Application of a constant KD of 1.48 * 10**-3 to high resolution N. pachyderma (s) B/Ca records from two adjacent cores off Iceland shows that subsurface pCO2 at the habitat depth of N. pachyderma (s) (~50 m) generally followed the atmospheric CO2 trend but with negative offsets of ~10-50 ppmv during 19-10 ka. These B/Ca-based reconstructions are supported by independent estimates from low-resolution d11B measurements in the same cores. We also calibrate and apply Cd/Ca in N. pachyderma (s) to reconstruct nutrient levels for the same down cores. Like today's North Atlantic, past subsurface pCO2 variability off Iceland was significantly correlated with nutrient changes that might be linked to surface nutrient utilization and mixing within the upper water column. Because surface pCO2 (at 0 m water depth) is always lower than at deeper depths and if the application of a constant KD is valid, our results suggest that the polar North Atlantic has remained a CO2 sink during the calcification seasons of N. pachyderma (s) over the last ... |
format |
Dataset |
author |
Yu, Jimin Thornalley, David JR Rae, James W B McCave, I Nick |
spellingShingle |
Yu, Jimin Thornalley, David JR Rae, James W B McCave, I Nick Calibration and application of B/Ca, Cd/Ca, and d11B in Neogloboquadrina pachyderma (sinistral) |
author_facet |
Yu, Jimin Thornalley, David JR Rae, James W B McCave, I Nick |
author_sort |
Yu, Jimin |
title |
Calibration and application of B/Ca, Cd/Ca, and d11B in Neogloboquadrina pachyderma (sinistral) |
title_short |
Calibration and application of B/Ca, Cd/Ca, and d11B in Neogloboquadrina pachyderma (sinistral) |
title_full |
Calibration and application of B/Ca, Cd/Ca, and d11B in Neogloboquadrina pachyderma (sinistral) |
title_fullStr |
Calibration and application of B/Ca, Cd/Ca, and d11B in Neogloboquadrina pachyderma (sinistral) |
title_full_unstemmed |
Calibration and application of B/Ca, Cd/Ca, and d11B in Neogloboquadrina pachyderma (sinistral) |
title_sort |
calibration and application of b/ca, cd/ca, and d11b in neogloboquadrina pachyderma (sinistral) |
publisher |
PANGAEA |
publishDate |
2013 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.821825 https://doi.org/10.1594/PANGAEA.821825 |
op_coverage |
MEDIAN LATITUDE: 60.419404 * MEDIAN LONGITUDE: -9.154811 * SOUTH-BOUND LATITUDE: 50.710000 * WEST-BOUND LONGITUDE: -52.952000 * NORTH-BOUND LATITUDE: 63.760000 * EAST-BOUND LONGITUDE: 52.950000 |
long_lat |
ENVELOPE(-52.952000,52.950000,63.760000,50.710000) |
geographic |
Norwegian Sea |
geographic_facet |
Norwegian Sea |
genre |
Iceland Neogloboquadrina pachyderma North Atlantic Norwegian Sea Planktonic foraminifera |
genre_facet |
Iceland Neogloboquadrina pachyderma North Atlantic Norwegian Sea Planktonic foraminifera |
op_source |
Supplement to: Yu, Jimin; Thornalley, David JR; Rae, James W B; McCave, I Nick (2013): Calibration and application of B/Ca, Cd/Ca, and d11B in Neogloboquadrina pachyderma (sinistral) to constrain CO2 uptake in the subpolar North Atlantic during the last deglaciation. Paleoceanography, 28(2), 237-252, https://doi.org/10.1002/palo.20024 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.821825 https://doi.org/10.1594/PANGAEA.821825 |
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.821825 https://doi.org/10.1002/palo.20024 |
_version_ |
1766039768577081344 |