Deglacial climate changes as forced by different ice sheet reconstructions
International audience Abstract. During the last deglaciation, the climate evolves from a cold state at the Last Glacial Maximum (LGM) at 21 ka (thousand years ago) with large ice sheets to the warm Holocene at ∼9 ka with reduced ice sheets. The deglacial ice sheet melt can impact the climate throug...
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Online Access: | https://hal.science/hal-04125578 https://hal.science/hal-04125578/document https://hal.science/hal-04125578/file/cp-19-1027-2023.pdf https://doi.org/10.5194/cp-19-1027-2023 |
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ftuniversailles:oai:HAL:hal-04125578v1 2024-04-28T08:02:50+00:00 Deglacial climate changes as forced by different ice sheet reconstructions Bouttes, Nathaelle Lhardy, Fanny Quiquet, Aurélien Paillard, Didier Goosse, Hugues Roche, Didier M. 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) 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)) Earth and Life Institute - Environmental Sciences (ELIE) Université Catholique de Louvain = Catholic University of Louvain (UCL) Cluster Earth and Climate Amsterdam Department of Earth Sciences Amsterdam Vrije Universiteit Amsterdam Amsterdam (VU)-Vrije Universiteit Amsterdam Amsterdam (VU) 2023 https://hal.science/hal-04125578 https://hal.science/hal-04125578/document https://hal.science/hal-04125578/file/cp-19-1027-2023.pdf https://doi.org/10.5194/cp-19-1027-2023 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-19-1027-2023 hal-04125578 https://hal.science/hal-04125578 https://hal.science/hal-04125578/document https://hal.science/hal-04125578/file/cp-19-1027-2023.pdf doi:10.5194/cp-19-1027-2023 info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-04125578 Climate of the Past, 2023, 19 (5), pp.1027-1042. ⟨10.5194/cp-19-1027-2023⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2023 ftuniversailles https://doi.org/10.5194/cp-19-1027-2023 2024-04-04T17:28:57Z International audience Abstract. During the last deglaciation, the climate evolves from a cold state at the Last Glacial Maximum (LGM) at 21 ka (thousand years ago) with large ice sheets to the warm Holocene at ∼9 ka with reduced ice sheets. The deglacial ice sheet melt can impact the climate through multiple ways: changes of topography and albedo, bathymetry and coastlines, and freshwater fluxes (FWFs). In the PMIP4 (Paleoclimate Modelling Intercomparison Project – Phase 4) protocol for deglacial simulations, these changes can be accounted for or not depending on the modelling group choices. In addition, two ice sheet reconstructions are available (ICE-6G_C and GLAC-1D). In this study, we evaluate all these effects related to ice sheet changes on the climate using the iLOVECLIM model of intermediate complexity. We show that the two reconstructions yield the same warming to a first order but with a different amplitude (global mean temperature of 3.9 ∘C with ICE-6G_C and 3.8 ∘C with GLAC-1D) and evolution. We obtain a stalling of temperature rise during the Antarctic Cold Reversal (ACR, from ∼14 to ∼12 ka) similar to proxy data only with the GLAC-1D ice sheet reconstruction. Accounting for changes in bathymetry in the simulations results in a cooling due to a larger sea ice extent and higher surface albedo. Finally, freshwater fluxes result in Atlantic meridional overturning circulation (AMOC) drawdown, but the timing in the simulations disagrees with proxy data of ocean circulation changes. This questions the causal link between reconstructed freshwater fluxes from ice sheet melt and recorded AMOC weakening. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Sea ice Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ Climate of the Past 19 5 1027 1042 |
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Open Polar |
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Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
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ftuniversailles |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Bouttes, Nathaelle Lhardy, Fanny Quiquet, Aurélien Paillard, Didier Goosse, Hugues Roche, Didier M. Deglacial climate changes as forced by different ice sheet reconstructions |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Abstract. During the last deglaciation, the climate evolves from a cold state at the Last Glacial Maximum (LGM) at 21 ka (thousand years ago) with large ice sheets to the warm Holocene at ∼9 ka with reduced ice sheets. The deglacial ice sheet melt can impact the climate through multiple ways: changes of topography and albedo, bathymetry and coastlines, and freshwater fluxes (FWFs). In the PMIP4 (Paleoclimate Modelling Intercomparison Project – Phase 4) protocol for deglacial simulations, these changes can be accounted for or not depending on the modelling group choices. In addition, two ice sheet reconstructions are available (ICE-6G_C and GLAC-1D). In this study, we evaluate all these effects related to ice sheet changes on the climate using the iLOVECLIM model of intermediate complexity. We show that the two reconstructions yield the same warming to a first order but with a different amplitude (global mean temperature of 3.9 ∘C with ICE-6G_C and 3.8 ∘C with GLAC-1D) and evolution. We obtain a stalling of temperature rise during the Antarctic Cold Reversal (ACR, from ∼14 to ∼12 ka) similar to proxy data only with the GLAC-1D ice sheet reconstruction. Accounting for changes in bathymetry in the simulations results in a cooling due to a larger sea ice extent and higher surface albedo. Finally, freshwater fluxes result in Atlantic meridional overturning circulation (AMOC) drawdown, but the timing in the simulations disagrees with proxy data of ocean circulation changes. This questions the causal link between reconstructed freshwater fluxes from ice sheet melt and recorded AMOC weakening. |
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) 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)) Earth and Life Institute - Environmental Sciences (ELIE) Université Catholique de Louvain = Catholic University of Louvain (UCL) Cluster Earth and Climate Amsterdam Department of Earth Sciences Amsterdam Vrije Universiteit Amsterdam Amsterdam (VU)-Vrije Universiteit Amsterdam Amsterdam (VU) |
format |
Article in Journal/Newspaper |
author |
Bouttes, Nathaelle Lhardy, Fanny Quiquet, Aurélien Paillard, Didier Goosse, Hugues Roche, Didier M. |
author_facet |
Bouttes, Nathaelle Lhardy, Fanny Quiquet, Aurélien Paillard, Didier Goosse, Hugues Roche, Didier M. |
author_sort |
Bouttes, Nathaelle |
title |
Deglacial climate changes as forced by different ice sheet reconstructions |
title_short |
Deglacial climate changes as forced by different ice sheet reconstructions |
title_full |
Deglacial climate changes as forced by different ice sheet reconstructions |
title_fullStr |
Deglacial climate changes as forced by different ice sheet reconstructions |
title_full_unstemmed |
Deglacial climate changes as forced by different ice sheet reconstructions |
title_sort |
deglacial climate changes as forced by different ice sheet reconstructions |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04125578 https://hal.science/hal-04125578/document https://hal.science/hal-04125578/file/cp-19-1027-2023.pdf https://doi.org/10.5194/cp-19-1027-2023 |
genre |
Antarc* Antarctic Ice Sheet Sea ice |
genre_facet |
Antarc* Antarctic Ice Sheet Sea ice |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-04125578 Climate of the Past, 2023, 19 (5), pp.1027-1042. ⟨10.5194/cp-19-1027-2023⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-19-1027-2023 hal-04125578 https://hal.science/hal-04125578 https://hal.science/hal-04125578/document https://hal.science/hal-04125578/file/cp-19-1027-2023.pdf doi:10.5194/cp-19-1027-2023 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-19-1027-2023 |
container_title |
Climate of the Past |
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19 |
container_issue |
5 |
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1027 |
op_container_end_page |
1042 |
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