Calibration of the B/Ca proxy in the planktic foraminifer Orbulina universa to Paleocene seawater conditions

This research is funded by NSF [OCE12-32987] to BH. The B/Ca ratio of planktic foraminiferal calcite, a proxy for the surface ocean carbonate system, displays large negative excursions during the Paleocene-Eocene Thermal Maximum (PETM, 55.9 Ma), consistent with rapid ocean acidification at that time...

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Published in:Paleoceanography
Main Authors: Haynes, Laura L., Hönisch, Bärbel, Dyez, Kelsey A., Holland, Kate, Rosenthal, Yair, Fish, Carina R., Subhas, Adam V., Rae, James W. B.
Other Authors: NERC, University of St Andrews. Earth and Environmental Sciences, University of St Andrews. St Andrews Isotope Geochemistry
Format: Article in Journal/Newspaper
Language:English
Published: 2017
Subjects:
DAS
GE
GC
Online Access:http://hdl.handle.net/10023/12348
https://doi.org/10.1002/2016PA003069
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spelling ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/12348 2023-07-02T03:33:21+02:00 Calibration of the B/Ca proxy in the planktic foraminifer Orbulina universa to Paleocene seawater conditions Haynes, Laura L. Hönisch, Bärbel Dyez, Kelsey A. Holland, Kate Rosenthal, Yair Fish, Carina R. Subhas, Adam V. Rae, James W. B. NERC University of St Andrews. Earth and Environmental Sciences University of St Andrews. St Andrews Isotope Geochemistry 2017-12-17 application/pdf http://hdl.handle.net/10023/12348 https://doi.org/10.1002/2016PA003069 eng eng Paleoceanography Haynes , L L , Hönisch , B , Dyez , K A , Holland , K , Rosenthal , Y , Fish , C R , Subhas , A V & Rae , J W B 2017 , ' Calibration of the B/Ca proxy in the planktic foraminifer Orbulina universa to Paleocene seawater conditions ' , Paleoceanography , vol. 32 , no. 6 , pp. 580-599 . https://doi.org/10.1002/2016PA003069 1944-9186 PURE: 250026271 PURE UUID: 9a9f4b85-42cb-4329-826f-0a8b61c170f0 Bibtex: urn:e3e468c24bc547e8f0b924619dc09b52 Scopus: 85020548523 ORCID: /0000-0003-3904-2526/work/60196314 WOS: 000405638700005 http://hdl.handle.net/10023/12348 https://doi.org/10.1002/2016PA003069 NE/N011716/1 ©2017 American Geophysical Union. All Rights Reserved. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: https://dx.doi.org/10.1002/2016PA003069 O. universa B/Ca Paleocene-Eocene Thermal Maximum Ocean acidification Planktic foraminifera GE Environmental Sciences GC Oceanography DAS SDG 14 - Life Below Water GE GC Journal article 2017 ftstandrewserep https://doi.org/10.1002/2016PA003069 2023-06-13T18:27:35Z This research is funded by NSF [OCE12-32987] to BH. The B/Ca ratio of planktic foraminiferal calcite, a proxy for the surface ocean carbonate system, displays large negative excursions during the Paleocene-Eocene Thermal Maximum (PETM, 55.9 Ma), consistent with rapid ocean acidification at that time. However, the B/Ca excursion measured at the PETM exceeds a magnitude that modern pH-calibrations can explain. Numerous other controls on the proxy have been suggested, including foraminiferal growth rate and the total concentration of Dissolved Inorganic Carbon (DIC). Here we present new calibrations for B/Ca vs. the combined effects of pH and DIC in the symbiont-bearing planktic foraminifer Orbulina universa, grown in culture solutions with simulated Paleocene seawater elemental composition (high [Ca], low [Mg], and low [B]T). We also investigate the isolated effects of low seawater total boron concentration ([B]T), high [Ca], reduced symbiont photosynthetic activity, and average shell growth rate on O. universa B/Ca in order to further understand the proxy systematics and to determine other possible influences on the PETM records. We find that average shell growth rate does not appear to determine B/Ca in high calcite saturation experiments. In addition, our “Paleocene” calibration shows higher sensitivity than the modern calibration at low [B(OH)4-]/DIC. Given a large DIC pulse at the PETM, this amplification of the B/Ca response can more fully explain the PETM B/Ca excursion. However, further calibrations with other foraminifer species are needed to determine the range of foraminifer species-specific proxy sensitivities under these conditions for quantitative reconstruction of large carbon cycle perturbations. Publisher PDF Peer reviewed Article in Journal/Newspaper Ocean acidification University of St Andrews: Digital Research Repository Paleoceanography 32 6 580 599
institution Open Polar
collection University of St Andrews: Digital Research Repository
op_collection_id ftstandrewserep
language English
topic O. universa
B/Ca
Paleocene-Eocene Thermal Maximum
Ocean acidification
Planktic foraminifera
GE Environmental Sciences
GC Oceanography
DAS
SDG 14 - Life Below Water
GE
GC
spellingShingle O. universa
B/Ca
Paleocene-Eocene Thermal Maximum
Ocean acidification
Planktic foraminifera
GE Environmental Sciences
GC Oceanography
DAS
SDG 14 - Life Below Water
GE
GC
Haynes, Laura L.
Hönisch, Bärbel
Dyez, Kelsey A.
Holland, Kate
Rosenthal, Yair
Fish, Carina R.
Subhas, Adam V.
Rae, James W. B.
Calibration of the B/Ca proxy in the planktic foraminifer Orbulina universa to Paleocene seawater conditions
topic_facet O. universa
B/Ca
Paleocene-Eocene Thermal Maximum
Ocean acidification
Planktic foraminifera
GE Environmental Sciences
GC Oceanography
DAS
SDG 14 - Life Below Water
GE
GC
description This research is funded by NSF [OCE12-32987] to BH. The B/Ca ratio of planktic foraminiferal calcite, a proxy for the surface ocean carbonate system, displays large negative excursions during the Paleocene-Eocene Thermal Maximum (PETM, 55.9 Ma), consistent with rapid ocean acidification at that time. However, the B/Ca excursion measured at the PETM exceeds a magnitude that modern pH-calibrations can explain. Numerous other controls on the proxy have been suggested, including foraminiferal growth rate and the total concentration of Dissolved Inorganic Carbon (DIC). Here we present new calibrations for B/Ca vs. the combined effects of pH and DIC in the symbiont-bearing planktic foraminifer Orbulina universa, grown in culture solutions with simulated Paleocene seawater elemental composition (high [Ca], low [Mg], and low [B]T). We also investigate the isolated effects of low seawater total boron concentration ([B]T), high [Ca], reduced symbiont photosynthetic activity, and average shell growth rate on O. universa B/Ca in order to further understand the proxy systematics and to determine other possible influences on the PETM records. We find that average shell growth rate does not appear to determine B/Ca in high calcite saturation experiments. In addition, our “Paleocene” calibration shows higher sensitivity than the modern calibration at low [B(OH)4-]/DIC. Given a large DIC pulse at the PETM, this amplification of the B/Ca response can more fully explain the PETM B/Ca excursion. However, further calibrations with other foraminifer species are needed to determine the range of foraminifer species-specific proxy sensitivities under these conditions for quantitative reconstruction of large carbon cycle perturbations. Publisher PDF Peer reviewed
author2 NERC
University of St Andrews. Earth and Environmental Sciences
University of St Andrews. St Andrews Isotope Geochemistry
format Article in Journal/Newspaper
author Haynes, Laura L.
Hönisch, Bärbel
Dyez, Kelsey A.
Holland, Kate
Rosenthal, Yair
Fish, Carina R.
Subhas, Adam V.
Rae, James W. B.
author_facet Haynes, Laura L.
Hönisch, Bärbel
Dyez, Kelsey A.
Holland, Kate
Rosenthal, Yair
Fish, Carina R.
Subhas, Adam V.
Rae, James W. B.
author_sort Haynes, Laura L.
title Calibration of the B/Ca proxy in the planktic foraminifer Orbulina universa to Paleocene seawater conditions
title_short Calibration of the B/Ca proxy in the planktic foraminifer Orbulina universa to Paleocene seawater conditions
title_full Calibration of the B/Ca proxy in the planktic foraminifer Orbulina universa to Paleocene seawater conditions
title_fullStr Calibration of the B/Ca proxy in the planktic foraminifer Orbulina universa to Paleocene seawater conditions
title_full_unstemmed Calibration of the B/Ca proxy in the planktic foraminifer Orbulina universa to Paleocene seawater conditions
title_sort calibration of the b/ca proxy in the planktic foraminifer orbulina universa to paleocene seawater conditions
publishDate 2017
url http://hdl.handle.net/10023/12348
https://doi.org/10.1002/2016PA003069
genre Ocean acidification
genre_facet Ocean acidification
op_relation Paleoceanography
Haynes , L L , Hönisch , B , Dyez , K A , Holland , K , Rosenthal , Y , Fish , C R , Subhas , A V & Rae , J W B 2017 , ' Calibration of the B/Ca proxy in the planktic foraminifer Orbulina universa to Paleocene seawater conditions ' , Paleoceanography , vol. 32 , no. 6 , pp. 580-599 . https://doi.org/10.1002/2016PA003069
1944-9186
PURE: 250026271
PURE UUID: 9a9f4b85-42cb-4329-826f-0a8b61c170f0
Bibtex: urn:e3e468c24bc547e8f0b924619dc09b52
Scopus: 85020548523
ORCID: /0000-0003-3904-2526/work/60196314
WOS: 000405638700005
http://hdl.handle.net/10023/12348
https://doi.org/10.1002/2016PA003069
NE/N011716/1
op_rights ©2017 American Geophysical Union. All Rights Reserved. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: https://dx.doi.org/10.1002/2016PA003069
op_doi https://doi.org/10.1002/2016PA003069
container_title Paleoceanography
container_volume 32
container_issue 6
container_start_page 580
op_container_end_page 599
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