Glacial onset predated Late Ordovician climate cooling
International audience The Ordovician glaciation represents the acme of one of only three major icehouse periods in Earth's Phanerozoic history and is notorious for setting the scene for one of the "big five" mass extinction events. Nevertheless, the mechanisms that drove ice sheet gr...
Published in: | Paleoceanography |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2016
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Online Access: | https://hal.science/hal-02902792 https://hal.science/hal-02902792/document https://hal.science/hal-02902792/file/2016PA002928.pdf https://doi.org/10.1002/2016PA002928 |
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Institut national des sciences de l'Univers: HAL-INSU |
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English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology Pohl, Alexandre Donnadieu, Yannick Le Hir, Guillaume Ladant, Jean‐baptiste Dumas, Christophe Alvarez‐solas, Jorge Vandenbroucke, Thijs Glacial onset predated Late Ordovician climate cooling |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology |
description |
International audience The Ordovician glaciation represents the acme of one of only three major icehouse periods in Earth's Phanerozoic history and is notorious for setting the scene for one of the "big five" mass extinction events. Nevertheless, the mechanisms that drove ice sheet growth remain poorly understood and the final extent of the ice sheet crudely constrained. Here using an Earth system model with an innovative coupling method between ocean, atmosphere, and land ice accounting for climate and ice sheet feedback processes, we report simulations portraying for the first time the detailed evolution of the Ordovician ice sheet. We show that the emergence of the ice sheet happened in two discrete phases. In a counterintuitive sequence of events, the continental ice sheet appeared suddenly in a warm climate. Only during the second act, and set against a background of decreasing atmospheric CO 2 , followed steeply dropping temperatures and extending sea ice. The comparison with abundant sedimentological, geochemical, and micropaleontological data suggests that glacial onset may have occurred as early as the Middle Ordovician Darriwilian, in agreement with recent studies reporting third-order glacioeustatic cycles during the same period. The second step in ice sheet growth, typified by a sudden drop in tropical sea surface temperatures by ∼8 ∘ C and the further extension of a single, continental-scale ice sheet over Gondwana, marked the onset of the Hirnantian glacial maximum. By suggesting the presence of an ice sheet over Gondwana throughout most of the Middle and Late Ordovician, our models embrace the emerging paradigm of an "early Paleozoic Ice Age." |
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) 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) Modélisation du climat (CLIM) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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)) Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) |
format |
Article in Journal/Newspaper |
author |
Pohl, Alexandre Donnadieu, Yannick Le Hir, Guillaume Ladant, Jean‐baptiste Dumas, Christophe Alvarez‐solas, Jorge Vandenbroucke, Thijs |
author_facet |
Pohl, Alexandre Donnadieu, Yannick Le Hir, Guillaume Ladant, Jean‐baptiste Dumas, Christophe Alvarez‐solas, Jorge Vandenbroucke, Thijs |
author_sort |
Pohl, Alexandre |
title |
Glacial onset predated Late Ordovician climate cooling |
title_short |
Glacial onset predated Late Ordovician climate cooling |
title_full |
Glacial onset predated Late Ordovician climate cooling |
title_fullStr |
Glacial onset predated Late Ordovician climate cooling |
title_full_unstemmed |
Glacial onset predated Late Ordovician climate cooling |
title_sort |
glacial onset predated late ordovician climate cooling |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-02902792 https://hal.science/hal-02902792/document https://hal.science/hal-02902792/file/2016PA002928.pdf https://doi.org/10.1002/2016PA002928 |
genre |
Ice Sheet Sea ice |
genre_facet |
Ice Sheet Sea ice |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.science/hal-02902792 Paleoceanography, 2016, 31 (6), pp.800-821. ⟨10.1002/2016PA002928⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2016PA002928 hal-02902792 https://hal.science/hal-02902792 https://hal.science/hal-02902792/document https://hal.science/hal-02902792/file/2016PA002928.pdf doi:10.1002/2016PA002928 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2016PA002928 |
container_title |
Paleoceanography |
container_volume |
31 |
container_issue |
6 |
container_start_page |
800 |
op_container_end_page |
821 |
_version_ |
1797584756504788992 |
spelling |
ftinsu:oai:HAL:hal-02902792v1 2024-04-28T08:24:33+00:00 Glacial onset predated Late Ordovician climate cooling Pohl, Alexandre Donnadieu, Yannick Le Hir, Guillaume Ladant, Jean‐baptiste Dumas, Christophe Alvarez‐solas, Jorge Vandenbroucke, Thijs 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) 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) Modélisation du climat (CLIM) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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)) Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) 2016-06-30 https://hal.science/hal-02902792 https://hal.science/hal-02902792/document https://hal.science/hal-02902792/file/2016PA002928.pdf https://doi.org/10.1002/2016PA002928 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2016PA002928 hal-02902792 https://hal.science/hal-02902792 https://hal.science/hal-02902792/document https://hal.science/hal-02902792/file/2016PA002928.pdf doi:10.1002/2016PA002928 info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.science/hal-02902792 Paleoceanography, 2016, 31 (6), pp.800-821. ⟨10.1002/2016PA002928⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology info:eu-repo/semantics/article Journal articles 2016 ftinsu https://doi.org/10.1002/2016PA002928 2024-04-05T00:41:30Z International audience The Ordovician glaciation represents the acme of one of only three major icehouse periods in Earth's Phanerozoic history and is notorious for setting the scene for one of the "big five" mass extinction events. Nevertheless, the mechanisms that drove ice sheet growth remain poorly understood and the final extent of the ice sheet crudely constrained. Here using an Earth system model with an innovative coupling method between ocean, atmosphere, and land ice accounting for climate and ice sheet feedback processes, we report simulations portraying for the first time the detailed evolution of the Ordovician ice sheet. We show that the emergence of the ice sheet happened in two discrete phases. In a counterintuitive sequence of events, the continental ice sheet appeared suddenly in a warm climate. Only during the second act, and set against a background of decreasing atmospheric CO 2 , followed steeply dropping temperatures and extending sea ice. The comparison with abundant sedimentological, geochemical, and micropaleontological data suggests that glacial onset may have occurred as early as the Middle Ordovician Darriwilian, in agreement with recent studies reporting third-order glacioeustatic cycles during the same period. The second step in ice sheet growth, typified by a sudden drop in tropical sea surface temperatures by ∼8 ∘ C and the further extension of a single, continental-scale ice sheet over Gondwana, marked the onset of the Hirnantian glacial maximum. By suggesting the presence of an ice sheet over Gondwana throughout most of the Middle and Late Ordovician, our models embrace the emerging paradigm of an "early Paleozoic Ice Age." Article in Journal/Newspaper Ice Sheet Sea ice Institut national des sciences de l'Univers: HAL-INSU Paleoceanography 31 6 800 821 |