Modeling the Impact of Paleogeography on Cretaceous Ocean Deoxygenation
International audience Oceanic Anoxic Events (OAEs) were geologically short-lived events of widespread ocean deoxygenation and marine organic carbon burial and occurred mostly during the Cretaceous period. The development of OAEs is largely attributed to the impact of massive volcanism on climate an...
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ftceafr:oai:HAL:insu-03938068v1 2024-06-09T07:48:13+00:00 Modeling the Impact of Paleogeography on Cretaceous Ocean Deoxygenation Donnadieu, Yannick 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) à renseigner, Unknown Region 2022 https://insu.hal.science/insu-03938068 https://doi.org/10.5194/egusphere-egu22-11663 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu22-11663 insu-03938068 https://insu.hal.science/insu-03938068 BIBCODE: 2022EGUGA.2411663D doi:10.5194/egusphere-egu22-11663 EGU22 https://insu.hal.science/insu-03938068 EGU22, 2022, à renseigner, Unknown Region. ⟨10.5194/egusphere-egu22-11663⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/conferenceObject Conference papers 2022 ftceafr https://doi.org/10.5194/egusphere-egu22-11663 2024-05-16T13:40:10Z International audience Oceanic Anoxic Events (OAEs) were geologically short-lived events of widespread ocean deoxygenation and marine organic carbon burial and occurred mostly during the Cretaceous period. The development of OAEs is largely attributed to the impact of massive volcanism on climate and marine biogeochemistry; however, the lack of similar events during other carbon-cycle perturbations suggests additional mechanisms. We use the IPSL-CM5A2 Earth System Model to assess the role of changing paleogeography in priming the Cretaceous Ocean for large-scale decrease in intermediate and deep oxygen concentrations. We focus on three time-slices that present differences in potential gateway (e.g. the Central American Seaway) depth and basin configuration (e.g. the North Atlantic): the Aptian age (~120 Ma), the Cenomanian-Turonian boundary (~94 Ma) and the Maastrichtian age (~70 Ma). This set of simulations illustrates the impact of paleogeography on global circulation and its consequences for intermediate and deep water oxygenation. We also show results for two different atmospheric CO2 concentrations (2x and 4x pre-industrial) to study the additional influence of differing climatic states on oxygenation and primary productivity, and their importance relative to ocean dynamics. Conference Object North Atlantic HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
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HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
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English |
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[SDU]Sciences of the Universe [physics] |
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[SDU]Sciences of the Universe [physics] Donnadieu, Yannick Ladant, Jean-Baptiste Modeling the Impact of Paleogeography on Cretaceous Ocean Deoxygenation |
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[SDU]Sciences of the Universe [physics] |
description |
International audience Oceanic Anoxic Events (OAEs) were geologically short-lived events of widespread ocean deoxygenation and marine organic carbon burial and occurred mostly during the Cretaceous period. The development of OAEs is largely attributed to the impact of massive volcanism on climate and marine biogeochemistry; however, the lack of similar events during other carbon-cycle perturbations suggests additional mechanisms. We use the IPSL-CM5A2 Earth System Model to assess the role of changing paleogeography in priming the Cretaceous Ocean for large-scale decrease in intermediate and deep oxygen concentrations. We focus on three time-slices that present differences in potential gateway (e.g. the Central American Seaway) depth and basin configuration (e.g. the North Atlantic): the Aptian age (~120 Ma), the Cenomanian-Turonian boundary (~94 Ma) and the Maastrichtian age (~70 Ma). This set of simulations illustrates the impact of paleogeography on global circulation and its consequences for intermediate and deep water oxygenation. We also show results for two different atmospheric CO2 concentrations (2x and 4x pre-industrial) to study the additional influence of differing climatic states on oxygenation and primary productivity, and their importance relative to ocean dynamics. |
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) |
format |
Conference Object |
author |
Donnadieu, Yannick Ladant, Jean-Baptiste |
author_facet |
Donnadieu, Yannick Ladant, Jean-Baptiste |
author_sort |
Donnadieu, Yannick |
title |
Modeling the Impact of Paleogeography on Cretaceous Ocean Deoxygenation |
title_short |
Modeling the Impact of Paleogeography on Cretaceous Ocean Deoxygenation |
title_full |
Modeling the Impact of Paleogeography on Cretaceous Ocean Deoxygenation |
title_fullStr |
Modeling the Impact of Paleogeography on Cretaceous Ocean Deoxygenation |
title_full_unstemmed |
Modeling the Impact of Paleogeography on Cretaceous Ocean Deoxygenation |
title_sort |
modeling the impact of paleogeography on cretaceous ocean deoxygenation |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://insu.hal.science/insu-03938068 https://doi.org/10.5194/egusphere-egu22-11663 |
op_coverage |
à renseigner, Unknown Region |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
EGU22 https://insu.hal.science/insu-03938068 EGU22, 2022, à renseigner, Unknown Region. ⟨10.5194/egusphere-egu22-11663⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu22-11663 insu-03938068 https://insu.hal.science/insu-03938068 BIBCODE: 2022EGUGA.2411663D doi:10.5194/egusphere-egu22-11663 |
op_doi |
https://doi.org/10.5194/egusphere-egu22-11663 |
_version_ |
1801379857694720000 |