Deglacial climate changes as forced by different ice sheet reconstructions
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 topog...
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ftdoajarticles:oai:doaj.org/article:61803a42ee96442294485daa0fb3c926 2023-06-11T04:06:36+02:00 Deglacial climate changes as forced by different ice sheet reconstructions N. Bouttes F. Lhardy A. Quiquet D. Paillard H. Goosse D. M. Roche 2023-05-01T00:00:00Z https://doi.org/10.5194/cp-19-1027-2023 https://doaj.org/article/61803a42ee96442294485daa0fb3c926 EN eng Copernicus Publications https://cp.copernicus.org/articles/19/1027/2023/cp-19-1027-2023.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-19-1027-2023 1814-9324 1814-9332 https://doaj.org/article/61803a42ee96442294485daa0fb3c926 Climate of the Past, Vol 19, Pp 1027-1042 (2023) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2023 ftdoajarticles https://doi.org/10.5194/cp-19-1027-2023 2023-05-28T00:35:19Z 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 Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Climate of the Past 19 5 1027 1042 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 N. Bouttes F. Lhardy A. Quiquet D. Paillard H. Goosse D. M. Roche Deglacial climate changes as forced by different ice sheet reconstructions |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
N. Bouttes F. Lhardy A. Quiquet D. Paillard H. Goosse D. M. Roche |
author_facet |
N. Bouttes F. Lhardy A. Quiquet D. Paillard H. Goosse D. M. Roche |
author_sort |
N. Bouttes |
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 |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/cp-19-1027-2023 https://doaj.org/article/61803a42ee96442294485daa0fb3c926 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Sea ice |
genre_facet |
Antarc* Antarctic Ice Sheet Sea ice |
op_source |
Climate of the Past, Vol 19, Pp 1027-1042 (2023) |
op_relation |
https://cp.copernicus.org/articles/19/1027/2023/cp-19-1027-2023.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-19-1027-2023 1814-9324 1814-9332 https://doaj.org/article/61803a42ee96442294485daa0fb3c926 |
op_doi |
https://doi.org/10.5194/cp-19-1027-2023 |
container_title |
Climate of the Past |
container_volume |
19 |
container_issue |
5 |
container_start_page |
1027 |
op_container_end_page |
1042 |
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1768378630493175808 |