Geochemistry of the coccoliths: proxy of surface water conditions or of resilience of coccolithophores facing climate change ?
International audience Coccolithophores, the pelagic calcite ocean producers, experience ocean acidification and warming of Anthropocene. Concomitantly, they can recorde changes in pH and temperature (SST) in surface waters, through the incorporation of elements (B, Sr, Li, Mg) and isotopes (d 11 B)...
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HAL CCSD
2019
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Online Access: | https://hal.archives-ouvertes.fr/hal-02331914 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDE]Environmental Sciences |
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[SDE]Environmental Sciences Boye, Marie Sabata I Vilardell, Nicola Guéguen, Bleuenn Schmidt, Sabine Gardin, Silvia Beaufort, Luc Geochemistry of the coccoliths: proxy of surface water conditions or of resilience of coccolithophores facing climate change ? |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Coccolithophores, the pelagic calcite ocean producers, experience ocean acidification and warming of Anthropocene. Concomitantly, they can recorde changes in pH and temperature (SST) in surface waters, through the incorporation of elements (B, Sr, Li, Mg) and isotopes (d 11 B) in their biominerals (coccoliths) during biocalcification. Yet, geochemistry of coccoliths is still relatively unexplored so far, stressing the need for calibration of such proxies in coccoliths. In this work, we studied the geochemistry of coccoliths deposited on top-core sediments of worlwide ocean. Elemental and isotopic compositions of these archives were then plotted against in situ data of surface-pH and SST to investigate potential relationships. A positive relationship was found between the B/Ca ratio of large sedimentary coccoliths (5-12 µm, mainly C. leptoporus) and surface-pH as predicted by thermodynamics, indicating these biominerals could be used as an archive of surface acidification. Conversely, the relation was negative for those of small size (3-5 µm, essentially consisting of E. huxleyi and G. oceanica), suggesting an increase of pH in the internal vesicle where coccoliths are formed when pH is decreasing in surface waters. Intra-vesicular pH regulation is favourable for the precipitation of calcite. We also showed that Li/Mg in coccoliths-rich sediments could be used to estimate SST. Our work constitutes an important step towards the calibration of proxies in coccoliths either to reconstruct surface water conditions, or to explore biocalcification mechanisms that will help to better anticipate and reconstruct the evolution of the pelagic calcification. |
author2 |
Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Centre de recherche sur la Paléobiodiversité et les Paléoenvironnements (CR2P) Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC) Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA) |
format |
Conference Object |
author |
Boye, Marie Sabata I Vilardell, Nicola Guéguen, Bleuenn Schmidt, Sabine Gardin, Silvia Beaufort, Luc |
author_facet |
Boye, Marie Sabata I Vilardell, Nicola Guéguen, Bleuenn Schmidt, Sabine Gardin, Silvia Beaufort, Luc |
author_sort |
Boye, Marie |
title |
Geochemistry of the coccoliths: proxy of surface water conditions or of resilience of coccolithophores facing climate change ? |
title_short |
Geochemistry of the coccoliths: proxy of surface water conditions or of resilience of coccolithophores facing climate change ? |
title_full |
Geochemistry of the coccoliths: proxy of surface water conditions or of resilience of coccolithophores facing climate change ? |
title_fullStr |
Geochemistry of the coccoliths: proxy of surface water conditions or of resilience of coccolithophores facing climate change ? |
title_full_unstemmed |
Geochemistry of the coccoliths: proxy of surface water conditions or of resilience of coccolithophores facing climate change ? |
title_sort |
geochemistry of the coccoliths: proxy of surface water conditions or of resilience of coccolithophores facing climate change ? |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.archives-ouvertes.fr/hal-02331914 |
op_coverage |
Barcelona, Spain |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Goldschmidt 2019 https://hal.archives-ouvertes.fr/hal-02331914 Goldschmidt 2019, Aug 2019, Barcelona, Spain |
op_relation |
hal-02331914 https://hal.archives-ouvertes.fr/hal-02331914 |
_version_ |
1766158880545439744 |
spelling |
ftccsdartic:oai:HAL:hal-02331914v1 2023-05-15T17:51:40+02:00 Geochemistry of the coccoliths: proxy of surface water conditions or of resilience of coccolithophores facing climate change ? Boye, Marie Sabata I Vilardell, Nicola Guéguen, Bleuenn Schmidt, Sabine Gardin, Silvia Beaufort, Luc Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Centre de recherche sur la Paléobiodiversité et les Paléoenvironnements (CR2P) Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC) Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA) Barcelona, Spain 2019-08-18 https://hal.archives-ouvertes.fr/hal-02331914 en eng HAL CCSD hal-02331914 https://hal.archives-ouvertes.fr/hal-02331914 Goldschmidt 2019 https://hal.archives-ouvertes.fr/hal-02331914 Goldschmidt 2019, Aug 2019, Barcelona, Spain [SDE]Environmental Sciences info:eu-repo/semantics/conferenceObject Conference papers 2019 ftccsdartic 2021-12-19T01:44:37Z International audience Coccolithophores, the pelagic calcite ocean producers, experience ocean acidification and warming of Anthropocene. Concomitantly, they can recorde changes in pH and temperature (SST) in surface waters, through the incorporation of elements (B, Sr, Li, Mg) and isotopes (d 11 B) in their biominerals (coccoliths) during biocalcification. Yet, geochemistry of coccoliths is still relatively unexplored so far, stressing the need for calibration of such proxies in coccoliths. In this work, we studied the geochemistry of coccoliths deposited on top-core sediments of worlwide ocean. Elemental and isotopic compositions of these archives were then plotted against in situ data of surface-pH and SST to investigate potential relationships. A positive relationship was found between the B/Ca ratio of large sedimentary coccoliths (5-12 µm, mainly C. leptoporus) and surface-pH as predicted by thermodynamics, indicating these biominerals could be used as an archive of surface acidification. Conversely, the relation was negative for those of small size (3-5 µm, essentially consisting of E. huxleyi and G. oceanica), suggesting an increase of pH in the internal vesicle where coccoliths are formed when pH is decreasing in surface waters. Intra-vesicular pH regulation is favourable for the precipitation of calcite. We also showed that Li/Mg in coccoliths-rich sediments could be used to estimate SST. Our work constitutes an important step towards the calibration of proxies in coccoliths either to reconstruct surface water conditions, or to explore biocalcification mechanisms that will help to better anticipate and reconstruct the evolution of the pelagic calcification. Conference Object Ocean acidification Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |