Climate and low latitude water cycle variations during the Quaternary : a model-data approach
Quaternary glacial-interglacial cycles are recorded in various climatic archives from high to low latitudes. The EPICA Dome C ice core provides a high-resolution record over the last 800 ka of δ18Oatm (i.e. δ18O of atmospheric O2) which combines past variations of the low latitude water cycle and of...
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ftunivnantes:oai:HAL:tel-02986449v1 2023-05-15T16:06:18+02:00 Climate and low latitude water cycle variations during the Quaternary : a model-data approach Variations climatiques et variations du cycle hydrologique aux basses latitudes au cours du Quaternaire : une approche combinant modèle et données Extier, Thomas Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Université Paris Saclay (COmUE) Amaëlle Landais Didier Roche 2019-10-18 https://theses.hal.science/tel-02986449 https://theses.hal.science/tel-02986449/document https://theses.hal.science/tel-02986449/file/79543_EXTIER_2019_archivage.pdf fr fre HAL CCSD NNT: 2019SACLV056 tel-02986449 https://theses.hal.science/tel-02986449 https://theses.hal.science/tel-02986449/document https://theses.hal.science/tel-02986449/file/79543_EXTIER_2019_archivage.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-02986449 Sciences de la Terre. Université Paris Saclay (COmUE), 2019. Français. ⟨NNT : 2019SACLV056⟩ Low latitude hydrological cycle Isotopic composition of atmospheric oxygen Ice core Chronology Climate modeling Cycle hydrologique des basses latitudes Composition isotopique de l'oxygène de l'air Carotte de glace Chronologie Modélisation du climat [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/doctoralThesis Theses 2019 ftunivnantes 2023-03-08T03:41:50Z Quaternary glacial-interglacial cycles are recorded in various climatic archives from high to low latitudes. The EPICA Dome C ice core provides a high-resolution record over the last 800 ka of δ18Oatm (i.e. δ18O of atmospheric O2) which combines past variations of the low latitude water cycle and of the biosphere productivity. In absence of annual layer counting, this proxy can be used for orbital dating in association with the June 21st insolation at 65°N to build an ice core chronology. However a lag of 6 ka between the δ18Oatm and the insolation, classically observed during glacial-interglacial terminations, is applied to the entire record during the chronology construction. This lag and the complexity of the δ18Oatm signal are the main reasons why the ice core chronology presents a high 6 ka uncertainty which limits their interpretation, jointly with other paleoclimate archives, in terms of past climate and environmental variations. To solve this issue I have developed a new ice core chronology based on the relation between the δ18Oatm and the δ18Ocalcite of east-asian speleothems, using new isotope measurements allowing for the first time a complete record over the last 800 ka at Dome C. This new chronology reduces the uncertainties compared to the actual ice core chronology strongly based on δ18Oatm and shows a better sequence of events between the high and low latitudes records. Then, I have developed a model to reproduce the isotopic composition of atmospheric O2 to address the lack of quantitative interpretations of this proxy and to check our assumption of synchronicity with the δ18Ocalcite over several climatic cycles. To reproduce the variations of the δ18Oatm, it was necessary to couple the intermediate complexity climate model iLOVECLIM and the vegetation model CARAIB. Finally, the δ18Oatm variations simulated with the new coupled model over several thousand years are in phase with the insolation of the Northern hemisphere (except during Heinrich events) and with low latitudes δ18Ocalcite ... Doctoral or Postdoctoral Thesis EPICA ice core Université de Nantes: HAL-UNIV-NANTES |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
French |
topic |
Low latitude hydrological cycle Isotopic composition of atmospheric oxygen Ice core Chronology Climate modeling Cycle hydrologique des basses latitudes Composition isotopique de l'oxygène de l'air Carotte de glace Chronologie Modélisation du climat [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Low latitude hydrological cycle Isotopic composition of atmospheric oxygen Ice core Chronology Climate modeling Cycle hydrologique des basses latitudes Composition isotopique de l'oxygène de l'air Carotte de glace Chronologie Modélisation du climat [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Extier, Thomas Climate and low latitude water cycle variations during the Quaternary : a model-data approach |
topic_facet |
Low latitude hydrological cycle Isotopic composition of atmospheric oxygen Ice core Chronology Climate modeling Cycle hydrologique des basses latitudes Composition isotopique de l'oxygène de l'air Carotte de glace Chronologie Modélisation du climat [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
Quaternary glacial-interglacial cycles are recorded in various climatic archives from high to low latitudes. The EPICA Dome C ice core provides a high-resolution record over the last 800 ka of δ18Oatm (i.e. δ18O of atmospheric O2) which combines past variations of the low latitude water cycle and of the biosphere productivity. In absence of annual layer counting, this proxy can be used for orbital dating in association with the June 21st insolation at 65°N to build an ice core chronology. However a lag of 6 ka between the δ18Oatm and the insolation, classically observed during glacial-interglacial terminations, is applied to the entire record during the chronology construction. This lag and the complexity of the δ18Oatm signal are the main reasons why the ice core chronology presents a high 6 ka uncertainty which limits their interpretation, jointly with other paleoclimate archives, in terms of past climate and environmental variations. To solve this issue I have developed a new ice core chronology based on the relation between the δ18Oatm and the δ18Ocalcite of east-asian speleothems, using new isotope measurements allowing for the first time a complete record over the last 800 ka at Dome C. This new chronology reduces the uncertainties compared to the actual ice core chronology strongly based on δ18Oatm and shows a better sequence of events between the high and low latitudes records. Then, I have developed a model to reproduce the isotopic composition of atmospheric O2 to address the lack of quantitative interpretations of this proxy and to check our assumption of synchronicity with the δ18Ocalcite over several climatic cycles. To reproduce the variations of the δ18Oatm, it was necessary to couple the intermediate complexity climate model iLOVECLIM and the vegetation model CARAIB. Finally, the δ18Oatm variations simulated with the new coupled model over several thousand years are in phase with the insolation of the Northern hemisphere (except during Heinrich events) and with low latitudes δ18Ocalcite ... |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Université Paris Saclay (COmUE) Amaëlle Landais Didier Roche |
format |
Doctoral or Postdoctoral Thesis |
author |
Extier, Thomas |
author_facet |
Extier, Thomas |
author_sort |
Extier, Thomas |
title |
Climate and low latitude water cycle variations during the Quaternary : a model-data approach |
title_short |
Climate and low latitude water cycle variations during the Quaternary : a model-data approach |
title_full |
Climate and low latitude water cycle variations during the Quaternary : a model-data approach |
title_fullStr |
Climate and low latitude water cycle variations during the Quaternary : a model-data approach |
title_full_unstemmed |
Climate and low latitude water cycle variations during the Quaternary : a model-data approach |
title_sort |
climate and low latitude water cycle variations during the quaternary : a model-data approach |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://theses.hal.science/tel-02986449 https://theses.hal.science/tel-02986449/document https://theses.hal.science/tel-02986449/file/79543_EXTIER_2019_archivage.pdf |
genre |
EPICA ice core |
genre_facet |
EPICA ice core |
op_source |
https://theses.hal.science/tel-02986449 Sciences de la Terre. Université Paris Saclay (COmUE), 2019. Français. ⟨NNT : 2019SACLV056⟩ |
op_relation |
NNT: 2019SACLV056 tel-02986449 https://theses.hal.science/tel-02986449 https://theses.hal.science/tel-02986449/document https://theses.hal.science/tel-02986449/file/79543_EXTIER_2019_archivage.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766402192715022336 |