Carbon isotope offsets between benthic foraminifer species of the genus Cibicides (Cibicidoides) in the glacial sub-Antarctic Atlantic
Epibenthic foraminifer delta C-13 measurements are valuable for reconstructing past bottom water dissolved inorganic carbon d13C (delta C-13(DIC)), which are used to infer global ocean circulation patterns. Epibenthic delta C-13, however, may also reflect the influence of C-13-depleted phytodetritus...
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Amer Geophysical Union
2016
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Online Access: | https://archimer.ifremer.fr/doc/00421/53207/54927.pdf https://archimer.ifremer.fr/doc/00421/53207/54928.pdf https://doi.org/10.1002/2016PA003029 https://archimer.ifremer.fr/doc/00421/53207/ |
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ftarchimer:oai:archimer.ifremer.fr:53207 2023-05-15T13:50:50+02:00 Carbon isotope offsets between benthic foraminifer species of the genus Cibicides (Cibicidoides) in the glacial sub-Antarctic Atlantic Gottschalk, Julia Riveiros, Natalia Vazquez Waelbroeck, Claire Skinner, Luke C. Michel, Elisabeth Duplessy, Jean-claude Hodell, David Mackensen, Andreas 2016-12 application/pdf https://archimer.ifremer.fr/doc/00421/53207/54927.pdf https://archimer.ifremer.fr/doc/00421/53207/54928.pdf https://doi.org/10.1002/2016PA003029 https://archimer.ifremer.fr/doc/00421/53207/ eng eng Amer Geophysical Union info:eu-repo/grantAgreement/EC/FP7/339108/EU//ACCLIMATE info:eu-repo/grantAgreement/EC/FP7/243908/EU//PAST4FUTURE https://archimer.ifremer.fr/doc/00421/53207/54927.pdf https://archimer.ifremer.fr/doc/00421/53207/54928.pdf doi:10.1002/2016PA003029 https://archimer.ifremer.fr/doc/00421/53207/ 2016. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2016-12 , Vol. 31 , N. 12 , P. 1583-1602 text Publication info:eu-repo/semantics/article 2016 ftarchimer https://doi.org/10.1002/2016PA003029 2021-09-23T20:30:24Z Epibenthic foraminifer delta C-13 measurements are valuable for reconstructing past bottom water dissolved inorganic carbon d13C (delta C-13(DIC)), which are used to infer global ocean circulation patterns. Epibenthic delta C-13, however, may also reflect the influence of C-13-depleted phytodetritus, microhabitat changes, and/or variations in carbonate ion concentrations. Here we compare the delta C-13 of two benthic foraminifer species, Cibicides kullenbergi and Cibicides wuellerstorfi, and their morphotypes, in three sub-Antarctic Atlantic sediment cores over several glacial-interglacial transitions. These species are commonly assumed to be epibenthic, living above or directly below the sediment-water interface. While this might be consistent with the small delta C-13 offset that we observe between these species during late Pleistocene interglacial periods (Delta delta C-13=-0.19 +/- 0.31%, N=63), it is more difficult to reconcile with the significant delta C-13 offset that is found between these species during glacial periods (Delta delta C-13=-0.76 +/- 0.44%, N=44). We test possible scenarios by analyzing Uvigerina spp delta C-13 and benthic foraminifer abundances: (1) C. kullenbergi delta C-13 is biased to light values either due to microhabitat shifts or phytodetritus effects and (2) C. wuellerstorfi delta C-13 is biased to heavy values, relative to long-term average conditions, for instance by recording the sporadic occurrence of less depleted deepwater delta C-13(DIC). Neither of these scenarios can be ruled out unequivocally. However, our findings emphasize that supposedly epibenthic foraminifer delta C-13 in the sub-Antarctic Atlantic may reflect several factors rather than being solely a function of bottom water delta C-13(DIC). This could have a direct bearing on the interpretation of extremely light South Atlantic delta C-13 values at the Last Glacial Maximum. Article in Journal/Newspaper Antarc* Antarctic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Paleoceanography 31 12 1583 1602 |
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Open Polar |
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Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
Epibenthic foraminifer delta C-13 measurements are valuable for reconstructing past bottom water dissolved inorganic carbon d13C (delta C-13(DIC)), which are used to infer global ocean circulation patterns. Epibenthic delta C-13, however, may also reflect the influence of C-13-depleted phytodetritus, microhabitat changes, and/or variations in carbonate ion concentrations. Here we compare the delta C-13 of two benthic foraminifer species, Cibicides kullenbergi and Cibicides wuellerstorfi, and their morphotypes, in three sub-Antarctic Atlantic sediment cores over several glacial-interglacial transitions. These species are commonly assumed to be epibenthic, living above or directly below the sediment-water interface. While this might be consistent with the small delta C-13 offset that we observe between these species during late Pleistocene interglacial periods (Delta delta C-13=-0.19 +/- 0.31%, N=63), it is more difficult to reconcile with the significant delta C-13 offset that is found between these species during glacial periods (Delta delta C-13=-0.76 +/- 0.44%, N=44). We test possible scenarios by analyzing Uvigerina spp delta C-13 and benthic foraminifer abundances: (1) C. kullenbergi delta C-13 is biased to light values either due to microhabitat shifts or phytodetritus effects and (2) C. wuellerstorfi delta C-13 is biased to heavy values, relative to long-term average conditions, for instance by recording the sporadic occurrence of less depleted deepwater delta C-13(DIC). Neither of these scenarios can be ruled out unequivocally. However, our findings emphasize that supposedly epibenthic foraminifer delta C-13 in the sub-Antarctic Atlantic may reflect several factors rather than being solely a function of bottom water delta C-13(DIC). This could have a direct bearing on the interpretation of extremely light South Atlantic delta C-13 values at the Last Glacial Maximum. |
format |
Article in Journal/Newspaper |
author |
Gottschalk, Julia Riveiros, Natalia Vazquez Waelbroeck, Claire Skinner, Luke C. Michel, Elisabeth Duplessy, Jean-claude Hodell, David Mackensen, Andreas |
spellingShingle |
Gottschalk, Julia Riveiros, Natalia Vazquez Waelbroeck, Claire Skinner, Luke C. Michel, Elisabeth Duplessy, Jean-claude Hodell, David Mackensen, Andreas Carbon isotope offsets between benthic foraminifer species of the genus Cibicides (Cibicidoides) in the glacial sub-Antarctic Atlantic |
author_facet |
Gottschalk, Julia Riveiros, Natalia Vazquez Waelbroeck, Claire Skinner, Luke C. Michel, Elisabeth Duplessy, Jean-claude Hodell, David Mackensen, Andreas |
author_sort |
Gottschalk, Julia |
title |
Carbon isotope offsets between benthic foraminifer species of the genus Cibicides (Cibicidoides) in the glacial sub-Antarctic Atlantic |
title_short |
Carbon isotope offsets between benthic foraminifer species of the genus Cibicides (Cibicidoides) in the glacial sub-Antarctic Atlantic |
title_full |
Carbon isotope offsets between benthic foraminifer species of the genus Cibicides (Cibicidoides) in the glacial sub-Antarctic Atlantic |
title_fullStr |
Carbon isotope offsets between benthic foraminifer species of the genus Cibicides (Cibicidoides) in the glacial sub-Antarctic Atlantic |
title_full_unstemmed |
Carbon isotope offsets between benthic foraminifer species of the genus Cibicides (Cibicidoides) in the glacial sub-Antarctic Atlantic |
title_sort |
carbon isotope offsets between benthic foraminifer species of the genus cibicides (cibicidoides) in the glacial sub-antarctic atlantic |
publisher |
Amer Geophysical Union |
publishDate |
2016 |
url |
https://archimer.ifremer.fr/doc/00421/53207/54927.pdf https://archimer.ifremer.fr/doc/00421/53207/54928.pdf https://doi.org/10.1002/2016PA003029 https://archimer.ifremer.fr/doc/00421/53207/ |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2016-12 , Vol. 31 , N. 12 , P. 1583-1602 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/339108/EU//ACCLIMATE info:eu-repo/grantAgreement/EC/FP7/243908/EU//PAST4FUTURE https://archimer.ifremer.fr/doc/00421/53207/54927.pdf https://archimer.ifremer.fr/doc/00421/53207/54928.pdf doi:10.1002/2016PA003029 https://archimer.ifremer.fr/doc/00421/53207/ |
op_rights |
2016. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1002/2016PA003029 |
container_title |
Paleoceanography |
container_volume |
31 |
container_issue |
12 |
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1583 |
op_container_end_page |
1602 |
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1766254163300188160 |