Revisiting the impact of the Drake Passage opening on ocean circulation and Eocene climate - A model study with paleo-friendly conditions
International audience The impact of the Drake Passage (DP) opening on climate is being debated for dozens of years. Indeed, being one ofthe major geographical changes occurring during the Eocene and at the beginning of a global climate cooling, it hasoften generated a lot of interest. To date, even...
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ftinsu:oai:HAL:insu-02090782v1 2024-02-11T09:57:10+01:00 Revisiting the impact of the Drake Passage opening on ocean circulation and Eocene climate - A model study with paleo-friendly conditions Toumoulin, Agathe Donnadieu, Yannick Ladant, Jean-Baptiste Dupont-Nivet, Guillaume Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Michigan Technological University (MTU) Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) Vienne, Austria 2019-04-07 https://insu.hal.science/insu-02090782 en eng HAL CCSD insu-02090782 https://insu.hal.science/insu-02090782 European Geosciences Union General Assembly 2019 https://insu.hal.science/insu-02090782 European Geosciences Union General Assembly 2019, Apr 2019, Vienne, Austria. , 21, pp.EGU2019-16686, 2019, Geophysical Research Abstracts https://www.egu2019.eu/ [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics info:eu-repo/semantics/conferenceObject Conference poster 2019 ftinsu 2024-01-24T17:36:15Z International audience The impact of the Drake Passage (DP) opening on climate is being debated for dozens of years. Indeed, being one ofthe major geographical changes occurring during the Eocene and at the beginning of a global climate cooling, it hasoften generated a lot of interest. To date, even though the overall signal remains unclear, it is considered as one ofthe main potential cause of the contemporaneous climate change. Several model studies have been aiming to assessthe importance of this gateway opening through different more or less complex models. However, according to ourknowledge on palaeoenvironments, most of them considered unrealistic boundary conditions (notably a low pCO2or a today-like geography) that might corrupt the transposition of their results to the original deep-time context. Inorder to better understand if and how climate might have been affected by this gateway opening the DP questionis here evaluated using an up2date IPCC like model, the IPSL-CM5A2, and Eocene-friendly boundary conditions(1120ppm, 40Ma land-sea distribution including an open Panama Seaway). Four simulations have been performedusing a closed Drake configuration and different DP depths 100m, 300m and 1000m. Striking changes are visible,since the earliest changes of the gateway opening, in the oceans dynamics and the Southern Ocean properties.However, the Drake throughflow remains weak, by far less intense than a mature Antarctic Circumpolar Currentand effects on temperatures remain geographically constrained. These experiments should help to understand ifthe impact of the DP was progressive or rather non linear while the passage deepened. Our results are compared toNeodymium and d13C data and discussed in the broader context of the Eocene-Oligocene climatic transition. Conference Object Antarc* Antarctic Drake Passage Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Antarctic Drake Passage Southern Ocean |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
spellingShingle |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics Toumoulin, Agathe Donnadieu, Yannick Ladant, Jean-Baptiste Dupont-Nivet, Guillaume Revisiting the impact of the Drake Passage opening on ocean circulation and Eocene climate - A model study with paleo-friendly conditions |
topic_facet |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
description |
International audience The impact of the Drake Passage (DP) opening on climate is being debated for dozens of years. Indeed, being one ofthe major geographical changes occurring during the Eocene and at the beginning of a global climate cooling, it hasoften generated a lot of interest. To date, even though the overall signal remains unclear, it is considered as one ofthe main potential cause of the contemporaneous climate change. Several model studies have been aiming to assessthe importance of this gateway opening through different more or less complex models. However, according to ourknowledge on palaeoenvironments, most of them considered unrealistic boundary conditions (notably a low pCO2or a today-like geography) that might corrupt the transposition of their results to the original deep-time context. Inorder to better understand if and how climate might have been affected by this gateway opening the DP questionis here evaluated using an up2date IPCC like model, the IPSL-CM5A2, and Eocene-friendly boundary conditions(1120ppm, 40Ma land-sea distribution including an open Panama Seaway). Four simulations have been performedusing a closed Drake configuration and different DP depths 100m, 300m and 1000m. Striking changes are visible,since the earliest changes of the gateway opening, in the oceans dynamics and the Southern Ocean properties.However, the Drake throughflow remains weak, by far less intense than a mature Antarctic Circumpolar Currentand effects on temperatures remain geographically constrained. These experiments should help to understand ifthe impact of the DP was progressive or rather non linear while the passage deepened. Our results are compared toNeodymium and d13C data and discussed in the broader context of the Eocene-Oligocene climatic transition. |
author2 |
Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Michigan Technological University (MTU) Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Toumoulin, Agathe Donnadieu, Yannick Ladant, Jean-Baptiste Dupont-Nivet, Guillaume |
author_facet |
Toumoulin, Agathe Donnadieu, Yannick Ladant, Jean-Baptiste Dupont-Nivet, Guillaume |
author_sort |
Toumoulin, Agathe |
title |
Revisiting the impact of the Drake Passage opening on ocean circulation and Eocene climate - A model study with paleo-friendly conditions |
title_short |
Revisiting the impact of the Drake Passage opening on ocean circulation and Eocene climate - A model study with paleo-friendly conditions |
title_full |
Revisiting the impact of the Drake Passage opening on ocean circulation and Eocene climate - A model study with paleo-friendly conditions |
title_fullStr |
Revisiting the impact of the Drake Passage opening on ocean circulation and Eocene climate - A model study with paleo-friendly conditions |
title_full_unstemmed |
Revisiting the impact of the Drake Passage opening on ocean circulation and Eocene climate - A model study with paleo-friendly conditions |
title_sort |
revisiting the impact of the drake passage opening on ocean circulation and eocene climate - a model study with paleo-friendly conditions |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://insu.hal.science/insu-02090782 |
op_coverage |
Vienne, Austria |
geographic |
Antarctic Drake Passage Southern Ocean |
geographic_facet |
Antarctic Drake Passage Southern Ocean |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_source |
European Geosciences Union General Assembly 2019 https://insu.hal.science/insu-02090782 European Geosciences Union General Assembly 2019, Apr 2019, Vienne, Austria. , 21, pp.EGU2019-16686, 2019, Geophysical Research Abstracts https://www.egu2019.eu/ |
op_relation |
insu-02090782 https://insu.hal.science/insu-02090782 |
_version_ |
1790609134692859904 |