Li/Mg ratio in scleractinian corals : a new powerful proxy for ocean paleo-temperatures ?
The Li/Mg paleothermometer was here updated in a calibration including 15 species of coral from culture or various environmental context, from tropical areas to deep Antarctic waters. This work showed that this new proxy well defines the whole ocean temperature range from -1 to 29°C, with a precisio...
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ftuniparissaclay:oai:HAL:tel-02971509v1 2024-06-16T07:34:09+00:00 Li/Mg ratio in scleractinian corals : a new powerful proxy for ocean paleo-temperatures ? Le rapport élémentaire Li/Mg dans les coraux scléractiniaires : un nouveau et puissant traceur des paléo-températures de l’océan ? Cuny-Guirriec, Kristan Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Université Paris-Saclay Eric Douville Edwige Pons-Branchu 2020-02-27 https://theses.hal.science/tel-02971509 https://theses.hal.science/tel-02971509/document https://theses.hal.science/tel-02971509/file/82622_CUNY-GUIRRIEC_2020_archivage.pdf fr fre HAL CCSD NNT: 2020UPASV009 tel-02971509 https://theses.hal.science/tel-02971509 https://theses.hal.science/tel-02971509/document https://theses.hal.science/tel-02971509/file/82622_CUNY-GUIRRIEC_2020_archivage.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-02971509 Climatologie. Université Paris-Saclay, 2020. Français. ⟨NNT : 2020UPASV009⟩ Climate change Ocean Paleo-Temperatures New geochemical proxy Li/Mg Corals Changement climatique Océan Paléo-Températures Nouveaux traceurs géochimiques Coraux [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/doctoralThesis Theses 2020 ftuniparissaclay 2024-05-23T23:50:04Z The Li/Mg paleothermometer was here updated in a calibration including 15 species of coral from culture or various environmental context, from tropical areas to deep Antarctic waters. This work showed that this new proxy well defines the whole ocean temperature range from -1 to 29°C, with a precision of ± 1.0°C. However, presence of organic matter or diagenetic calcite in the skeleton can bias the reconstructed temperatures. A specific chemical cleaning and micro analysis can overcome these effects. Yet, uncertainties of reconstructed temperatures are higher for tropical corals from shallow waters, largely subjected to seasonal variation of environmental factors (e.g. SST, light, precipitations). Calcification and growth processes of these zooxanthellate species, controlled by their localisation in the lagoon and by seasonal variation, seem to alter the precision of the Li/Mg proxy. By combining Li/Mg and Sr/Ca ratios in a multi-proxy approach, these uncertainties can be considerably reduced, with a precision reaching ± 0.6°C. In a first application, general and local calibrations were compared in order to reconstruct the historical evolution of temperatures from analysis on a Siderastrea siderea, sampled alive in Martinique. The resulting temporal series covers the last two centuries and clearly shows the global warming affecting the Caribbean, in agreement with existing data. A second application was conducted on fossil deep-water corals from Mediterranean Sea, providing the first reconstruction of the temperature evolution of intermediate waters since 55.000 years, with a particularly cold signal during LGM, in response of the last glacial/interglacial cycle. La calibration du paléo-thermomètre Li/Mg a ici été revisitée pour 15 espèces de corail mises en culture ou issues de contextes environnementaux variés, allant des régions tropicales aux eaux profondes Antarctiques. Ces travaux de thèse ont montré que ce nouveau proxy retrace bien toute la gamme de température de l’océan allant de -1 à 29°C, avec une ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctique* Archives ouvertes de Paris-Saclay Antarctic |
institution |
Open Polar |
collection |
Archives ouvertes de Paris-Saclay |
op_collection_id |
ftuniparissaclay |
language |
French |
topic |
Climate change Ocean Paleo-Temperatures New geochemical proxy Li/Mg Corals Changement climatique Océan Paléo-Températures Nouveaux traceurs géochimiques Coraux [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
Climate change Ocean Paleo-Temperatures New geochemical proxy Li/Mg Corals Changement climatique Océan Paléo-Températures Nouveaux traceurs géochimiques Coraux [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Cuny-Guirriec, Kristan Li/Mg ratio in scleractinian corals : a new powerful proxy for ocean paleo-temperatures ? |
topic_facet |
Climate change Ocean Paleo-Temperatures New geochemical proxy Li/Mg Corals Changement climatique Océan Paléo-Températures Nouveaux traceurs géochimiques Coraux [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
The Li/Mg paleothermometer was here updated in a calibration including 15 species of coral from culture or various environmental context, from tropical areas to deep Antarctic waters. This work showed that this new proxy well defines the whole ocean temperature range from -1 to 29°C, with a precision of ± 1.0°C. However, presence of organic matter or diagenetic calcite in the skeleton can bias the reconstructed temperatures. A specific chemical cleaning and micro analysis can overcome these effects. Yet, uncertainties of reconstructed temperatures are higher for tropical corals from shallow waters, largely subjected to seasonal variation of environmental factors (e.g. SST, light, precipitations). Calcification and growth processes of these zooxanthellate species, controlled by their localisation in the lagoon and by seasonal variation, seem to alter the precision of the Li/Mg proxy. By combining Li/Mg and Sr/Ca ratios in a multi-proxy approach, these uncertainties can be considerably reduced, with a precision reaching ± 0.6°C. In a first application, general and local calibrations were compared in order to reconstruct the historical evolution of temperatures from analysis on a Siderastrea siderea, sampled alive in Martinique. The resulting temporal series covers the last two centuries and clearly shows the global warming affecting the Caribbean, in agreement with existing data. A second application was conducted on fossil deep-water corals from Mediterranean Sea, providing the first reconstruction of the temperature evolution of intermediate waters since 55.000 years, with a particularly cold signal during LGM, in response of the last glacial/interglacial cycle. La calibration du paléo-thermomètre Li/Mg a ici été revisitée pour 15 espèces de corail mises en culture ou issues de contextes environnementaux variés, allant des régions tropicales aux eaux profondes Antarctiques. Ces travaux de thèse ont montré que ce nouveau proxy retrace bien toute la gamme de température de l’océan allant de -1 à 29°C, avec une ... |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Université Paris-Saclay Eric Douville Edwige Pons-Branchu |
format |
Doctoral or Postdoctoral Thesis |
author |
Cuny-Guirriec, Kristan |
author_facet |
Cuny-Guirriec, Kristan |
author_sort |
Cuny-Guirriec, Kristan |
title |
Li/Mg ratio in scleractinian corals : a new powerful proxy for ocean paleo-temperatures ? |
title_short |
Li/Mg ratio in scleractinian corals : a new powerful proxy for ocean paleo-temperatures ? |
title_full |
Li/Mg ratio in scleractinian corals : a new powerful proxy for ocean paleo-temperatures ? |
title_fullStr |
Li/Mg ratio in scleractinian corals : a new powerful proxy for ocean paleo-temperatures ? |
title_full_unstemmed |
Li/Mg ratio in scleractinian corals : a new powerful proxy for ocean paleo-temperatures ? |
title_sort |
li/mg ratio in scleractinian corals : a new powerful proxy for ocean paleo-temperatures ? |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://theses.hal.science/tel-02971509 https://theses.hal.science/tel-02971509/document https://theses.hal.science/tel-02971509/file/82622_CUNY-GUIRRIEC_2020_archivage.pdf |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctique* |
genre_facet |
Antarc* Antarctic Antarctique* |
op_source |
https://theses.hal.science/tel-02971509 Climatologie. Université Paris-Saclay, 2020. Français. ⟨NNT : 2020UPASV009⟩ |
op_relation |
NNT: 2020UPASV009 tel-02971509 https://theses.hal.science/tel-02971509 https://theses.hal.science/tel-02971509/document https://theses.hal.science/tel-02971509/file/82622_CUNY-GUIRRIEC_2020_archivage.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1802007828922105856 |