Climate-ice sheets interaction during the Cretaceous-Paleogene greenhouse (120-34 Ma) : impact of paleogeography and atmospheric CO2
On geological timescales, global climate proxies indicate that variations of large magnitude occur between the Cretaceous and the Cenozoic. On the long term, these variations are mostly determined by the equilibrium between the greenhouse gases composition of the atmosphere, primarily the CO2, and c...
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ftuniversailles:oai:HAL:tel-01326858v1 2024-04-28T08:02:49+00:00 Climate-ice sheets interaction during the Cretaceous-Paleogene greenhouse (120-34 Ma) : impact of paleogeography and atmospheric CO2 Interactions climat-calotte durant la greenhouse Crétacé-Paléogène (120-34 Ma) : influence de la paléogéographie et du CO2 atmosphérique Ladant, Jean-Baptiste 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 (COmUE) Yannick Donnadieu 2015-11-30 https://theses.hal.science/tel-01326858 https://theses.hal.science/tel-01326858/document https://theses.hal.science/tel-01326858/file/70803_LADANT_2015_archivage.pdf fr fre HAL CCSD NNT: 2015SACLV019 tel-01326858 https://theses.hal.science/tel-01326858 https://theses.hal.science/tel-01326858/document https://theses.hal.science/tel-01326858/file/70803_LADANT_2015_archivage.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-01326858 Climatologie. Université Paris Saclay (COmUE), 2015. Français. ⟨NNT : 2015SACLV019⟩ Climate modelling Paleoclimate Climate-Ice sheet interactions Modélisation Paléoclimatologie Interactions climat-Calottes [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/doctoralThesis Theses 2015 ftuniversailles 2024-04-04T17:39:21Z On geological timescales, global climate proxies indicate that variations of large magnitude occur between the Cretaceous and the Cenozoic. On the long term, these variations are mostly determined by the equilibrium between the greenhouse gases composition of the atmosphere, primarily the CO2, and continental weathering set up by the spatial location of Earth’s landmasses. Here, the links between paleogeography and CO2 are looked upon in a climate-ice sheet interactions framework during a greenhouse period of Earth history (120 – 34 Ma). A suite of models involving both coupled and ice sheet models have been used to demonstrate that paleogeographic reorganizations have regulated the presence of ice over Antarctica during the Cretaceous. In a second time and using a similar setup, a new method for climate-ice sheet coupling have been developed and applied to the Eocene-Oligocene (EO) glaciation to yield a new scenario of ice evolution, in good agreement with data. Two feedbacks related to this glaciation and the coeval atmospheric CO2 fall are investigated. First, it is shown that the EO glaciation generates an intensification of the Antarctic Circumpolar Current. Second, within a data-model study demonstrating active Asian monsoons as old as the mid-Eocene, it is shown that the climatic change at the end of the Eocene is responsible for a reduction in the intensity of the Asian monsoon. Finally, with the aim of analysing the effect of paleogeographic changes on marine biogeochemistry during the Cenozoic, sensitivity tests to Drake Passage and Panama Seaway have been carried out. Les enregistrements climatiques globaux à l’échelle géologique entre le Crétacé et le début du Cénozoïque indiquent des variations de grande amplitude. Sur le long terme, celles-ci sont déterminées par l’équilibre entre la composition atmosphérique en gaz à effet de serre, principalement le CO2, issus du dégazage volcanique et l’altération continentale, modulée par les mouvements tectoniques des continents. Dans cette thèse, les liens ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctica Drake Passage Ice Sheet Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
institution |
Open Polar |
collection |
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
op_collection_id |
ftuniversailles |
language |
French |
topic |
Climate modelling Paleoclimate Climate-Ice sheet interactions Modélisation Paléoclimatologie Interactions climat-Calottes [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
Climate modelling Paleoclimate Climate-Ice sheet interactions Modélisation Paléoclimatologie Interactions climat-Calottes [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Ladant, Jean-Baptiste Climate-ice sheets interaction during the Cretaceous-Paleogene greenhouse (120-34 Ma) : impact of paleogeography and atmospheric CO2 |
topic_facet |
Climate modelling Paleoclimate Climate-Ice sheet interactions Modélisation Paléoclimatologie Interactions climat-Calottes [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
On geological timescales, global climate proxies indicate that variations of large magnitude occur between the Cretaceous and the Cenozoic. On the long term, these variations are mostly determined by the equilibrium between the greenhouse gases composition of the atmosphere, primarily the CO2, and continental weathering set up by the spatial location of Earth’s landmasses. Here, the links between paleogeography and CO2 are looked upon in a climate-ice sheet interactions framework during a greenhouse period of Earth history (120 – 34 Ma). A suite of models involving both coupled and ice sheet models have been used to demonstrate that paleogeographic reorganizations have regulated the presence of ice over Antarctica during the Cretaceous. In a second time and using a similar setup, a new method for climate-ice sheet coupling have been developed and applied to the Eocene-Oligocene (EO) glaciation to yield a new scenario of ice evolution, in good agreement with data. Two feedbacks related to this glaciation and the coeval atmospheric CO2 fall are investigated. First, it is shown that the EO glaciation generates an intensification of the Antarctic Circumpolar Current. Second, within a data-model study demonstrating active Asian monsoons as old as the mid-Eocene, it is shown that the climatic change at the end of the Eocene is responsible for a reduction in the intensity of the Asian monsoon. Finally, with the aim of analysing the effect of paleogeographic changes on marine biogeochemistry during the Cenozoic, sensitivity tests to Drake Passage and Panama Seaway have been carried out. Les enregistrements climatiques globaux à l’échelle géologique entre le Crétacé et le début du Cénozoïque indiquent des variations de grande amplitude. Sur le long terme, celles-ci sont déterminées par l’équilibre entre la composition atmosphérique en gaz à effet de serre, principalement le CO2, issus du dégazage volcanique et l’altération continentale, modulée par les mouvements tectoniques des continents. Dans cette thèse, les liens ... |
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 (COmUE) Yannick Donnadieu |
format |
Doctoral or Postdoctoral Thesis |
author |
Ladant, Jean-Baptiste |
author_facet |
Ladant, Jean-Baptiste |
author_sort |
Ladant, Jean-Baptiste |
title |
Climate-ice sheets interaction during the Cretaceous-Paleogene greenhouse (120-34 Ma) : impact of paleogeography and atmospheric CO2 |
title_short |
Climate-ice sheets interaction during the Cretaceous-Paleogene greenhouse (120-34 Ma) : impact of paleogeography and atmospheric CO2 |
title_full |
Climate-ice sheets interaction during the Cretaceous-Paleogene greenhouse (120-34 Ma) : impact of paleogeography and atmospheric CO2 |
title_fullStr |
Climate-ice sheets interaction during the Cretaceous-Paleogene greenhouse (120-34 Ma) : impact of paleogeography and atmospheric CO2 |
title_full_unstemmed |
Climate-ice sheets interaction during the Cretaceous-Paleogene greenhouse (120-34 Ma) : impact of paleogeography and atmospheric CO2 |
title_sort |
climate-ice sheets interaction during the cretaceous-paleogene greenhouse (120-34 ma) : impact of paleogeography and atmospheric co2 |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://theses.hal.science/tel-01326858 https://theses.hal.science/tel-01326858/document https://theses.hal.science/tel-01326858/file/70803_LADANT_2015_archivage.pdf |
genre |
Antarc* Antarctic Antarctica Drake Passage Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Drake Passage Ice Sheet |
op_source |
https://theses.hal.science/tel-01326858 Climatologie. Université Paris Saclay (COmUE), 2015. Français. ⟨NNT : 2015SACLV019⟩ |
op_relation |
NNT: 2015SACLV019 tel-01326858 https://theses.hal.science/tel-01326858 https://theses.hal.science/tel-01326858/document https://theses.hal.science/tel-01326858/file/70803_LADANT_2015_archivage.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1797574061581139968 |