Radiocarbon age offsets between two surface dwelling planktonic foraminifera species during abrupt climate events in the SW Iberian Margin
This study identifies temporal biases in the radiocarbon ages of the planktonic foraminifera species Globigerina bulloides and Globigerinoides ruber (white) in a sediment core from the SW Iberian margin (so‐called Shackleton site). Leaching of the outer shell and measurement of the radiocarbon conte...
Published in: | Paleoceanography and Paleoclimatology |
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Language: | English |
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2020
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Online Access: | http://hdl.handle.net/10400.1/14138 https://doi.org/10.1029/2018PA003490 |
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ftunivalgarve:oai:sapientia.ualg.pt:10400.1/14138 2023-05-15T18:00:24+02:00 Radiocarbon age offsets between two surface dwelling planktonic foraminifera species during abrupt climate events in the SW Iberian Margin Ausín, Blanca Haghipour, Negar Wacker, Lukas Voelker, Antje Hodell, David Magill, Clayton Looser, Nathan Bernasconi, Stefano M. Eglinton, Timothy I. 2020-07-23T21:16:42Z http://hdl.handle.net/10400.1/14138 https://doi.org/10.1029/2018PA003490 eng eng Wiley info:eu-repo/grantAgreement/FCT/5876/147257/PT 2572-4525 http://hdl.handle.net/10400.1/14138 cv-prod-423420 doi:10.1029/2018PA003490 openAccess http://creativecommons.org/licenses/by/4.0/ CC-BY Western Iberian margin Planktonic foraminifera Radiocarbon dating article 2020 ftunivalgarve https://doi.org/10.1029/2018PA003490 2022-05-30T08:49:10Z This study identifies temporal biases in the radiocarbon ages of the planktonic foraminifera species Globigerina bulloides and Globigerinoides ruber (white) in a sediment core from the SW Iberian margin (so‐called Shackleton site). Leaching of the outer shell and measurement of the radiocarbon content of both the leachate and leached sample enabled us to identify surface contamination of the tests and its impact on their 14C ages. Incorporation of younger radiocarbon on the outer shell affected both species and had a larger impact downcore. Interspecies comparison of the 14C ages of the leached samples reveal systematic offsets with 14C ages for G. ruber being younger than G. bulloides ages during the last deglaciation and part of the Early and mid‐Holocene. The greatest offsets (up to 1,030 years) were found during Heinrich Stadial 1, the Younger Dryas, and part of the Holocene. The potential factors differentially affecting these two planktonic species were assessed by complementary 14C, oxygen and carbon isotopes, and species abundance determinations. The coupled effect of bioturbation with changes in the abundance of G. ruber is invoked to account for the large age offsets. Our results highlight that 14C ages of planktonic foraminifera might be largely compromised even in settings characterized by high sediment accumulation rates. Thus, a careful assessment of potential temporal biases must be performed prior to using 14C ages for paleoclimate investigations or radiocarbon calibrations (e.g., marine calibration curve Marine13, Reimer et al., 2013, https://doi.org/10.2458/azu_js_rc.55.16947). UID/Multi/04326/2019, IF/01500/2014 info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Planktonic foraminifera Universidade do Algarve: Sapienta Reimer ENVELOPE(-86.200,-86.200,-77.800,-77.800) Shackleton Paleoceanography and Paleoclimatology 34 1 63 78 |
institution |
Open Polar |
collection |
Universidade do Algarve: Sapienta |
op_collection_id |
ftunivalgarve |
language |
English |
topic |
Western Iberian margin Planktonic foraminifera Radiocarbon dating |
spellingShingle |
Western Iberian margin Planktonic foraminifera Radiocarbon dating Ausín, Blanca Haghipour, Negar Wacker, Lukas Voelker, Antje Hodell, David Magill, Clayton Looser, Nathan Bernasconi, Stefano M. Eglinton, Timothy I. Radiocarbon age offsets between two surface dwelling planktonic foraminifera species during abrupt climate events in the SW Iberian Margin |
topic_facet |
Western Iberian margin Planktonic foraminifera Radiocarbon dating |
description |
This study identifies temporal biases in the radiocarbon ages of the planktonic foraminifera species Globigerina bulloides and Globigerinoides ruber (white) in a sediment core from the SW Iberian margin (so‐called Shackleton site). Leaching of the outer shell and measurement of the radiocarbon content of both the leachate and leached sample enabled us to identify surface contamination of the tests and its impact on their 14C ages. Incorporation of younger radiocarbon on the outer shell affected both species and had a larger impact downcore. Interspecies comparison of the 14C ages of the leached samples reveal systematic offsets with 14C ages for G. ruber being younger than G. bulloides ages during the last deglaciation and part of the Early and mid‐Holocene. The greatest offsets (up to 1,030 years) were found during Heinrich Stadial 1, the Younger Dryas, and part of the Holocene. The potential factors differentially affecting these two planktonic species were assessed by complementary 14C, oxygen and carbon isotopes, and species abundance determinations. The coupled effect of bioturbation with changes in the abundance of G. ruber is invoked to account for the large age offsets. Our results highlight that 14C ages of planktonic foraminifera might be largely compromised even in settings characterized by high sediment accumulation rates. Thus, a careful assessment of potential temporal biases must be performed prior to using 14C ages for paleoclimate investigations or radiocarbon calibrations (e.g., marine calibration curve Marine13, Reimer et al., 2013, https://doi.org/10.2458/azu_js_rc.55.16947). UID/Multi/04326/2019, IF/01500/2014 info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Ausín, Blanca Haghipour, Negar Wacker, Lukas Voelker, Antje Hodell, David Magill, Clayton Looser, Nathan Bernasconi, Stefano M. Eglinton, Timothy I. |
author_facet |
Ausín, Blanca Haghipour, Negar Wacker, Lukas Voelker, Antje Hodell, David Magill, Clayton Looser, Nathan Bernasconi, Stefano M. Eglinton, Timothy I. |
author_sort |
Ausín, Blanca |
title |
Radiocarbon age offsets between two surface dwelling planktonic foraminifera species during abrupt climate events in the SW Iberian Margin |
title_short |
Radiocarbon age offsets between two surface dwelling planktonic foraminifera species during abrupt climate events in the SW Iberian Margin |
title_full |
Radiocarbon age offsets between two surface dwelling planktonic foraminifera species during abrupt climate events in the SW Iberian Margin |
title_fullStr |
Radiocarbon age offsets between two surface dwelling planktonic foraminifera species during abrupt climate events in the SW Iberian Margin |
title_full_unstemmed |
Radiocarbon age offsets between two surface dwelling planktonic foraminifera species during abrupt climate events in the SW Iberian Margin |
title_sort |
radiocarbon age offsets between two surface dwelling planktonic foraminifera species during abrupt climate events in the sw iberian margin |
publisher |
Wiley |
publishDate |
2020 |
url |
http://hdl.handle.net/10400.1/14138 https://doi.org/10.1029/2018PA003490 |
long_lat |
ENVELOPE(-86.200,-86.200,-77.800,-77.800) |
geographic |
Reimer Shackleton |
geographic_facet |
Reimer Shackleton |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
info:eu-repo/grantAgreement/FCT/5876/147257/PT 2572-4525 http://hdl.handle.net/10400.1/14138 cv-prod-423420 doi:10.1029/2018PA003490 |
op_rights |
openAccess http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2018PA003490 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
34 |
container_issue |
1 |
container_start_page |
63 |
op_container_end_page |
78 |
_version_ |
1766169481672916992 |