Climate and ice sheet evolutions from the last glacial maximum to the pre-industrial period with an ice-sheet–climate coupled model
| العنوان: | Climate and ice sheet evolutions from the last glacial maximum to the pre-industrial period with an ice-sheet–climate coupled model |
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| المؤلفون: | A. Quiquet, D. M. Roche, C. Dumas, N. Bouttes, F. Lhardy |
| المساهمون: | Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Modélisation du climat (CLIM), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Vrije Universiteit Amsterdam [Amsterdam] (VU), The research leading to these results has received funding from the SCOR foundation project COASTRISK, Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-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)-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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Earth Sciences |
| المصدر: | Climate of the Past, Vol 17, Pp 2179-2199 (2021) Climate of the Past Climate of the Past, 2021, 17 (5), pp.2179-2199. ⟨10.5194/cp-17-2179-2021⟩ Climate of the Past, European Geosciences Union (EGU), 2021, 17 (5), pp.2179-2199. ⟨10.5194/cp-17-2179-2021⟩ Climate of the Past, 17(5), 2179-2199. European Geosciences Union Quiquet, A, Roche, D M, Dumas, C, Bouttes, N & Lhardy, F 2021, ' Climate and ice sheet evolutions from the last glacial maximum to the pre-industrial period with an ice-sheet-climate coupled model ', Climate of the Past, vol. 17, no. 5, pp. 2179-2199 . https://doi.org/10.5194/cp-17-2179-2021 |
| بيانات النشر: | Copernicus Publications, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | 010504 meteorology & atmospheric sciences, Stratigraphy, 010502 geochemistry & geophysics, 01 natural sciences, Environmental protection, Environmental pollution, TD169-171.8, Deglaciation, SDG 13 - Climate Action, GE1-350, SDG 14 - Life Below Water, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, Holocene, 0105 earth and related environmental sciences, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Global and Planetary Change, geography, geography.geographical_feature_category, Lead (sea ice), Global warming, Paleontology, iLOVECLIM, Last Glacial Maximum, Ice-sheet model, Environmental sciences, TD172-193.5, 13. Climate action, Climatology, Climate model, Ice sheet, Geology |
| الوصف: | International audience; Abstract. The last deglaciation offers an unique opportunity to understand the climate–ice-sheet interactions in a global warming context. In this paper, to tackle this question, we use an Earth system model of intermediate complexity coupled to an ice sheet model covering the Northern Hemisphere to simulate the last deglaciation and the Holocene (26–0 ka). We use a synchronous coupling every year between the ice sheet and the rest of the climate system and we ensure a closed water cycle considering the release of freshwater flux to the ocean due to ice sheet melting. Our reference experiment displays a gradual warming in response to the forcings, with no abrupt changes. In this case, while the amplitude of the freshwater flux to the ocean induced by ice sheet retreat is realistic, it is sufficient to shut down the Atlantic meridional overturning circulation from which the model does not recover within the time period simulated. However, with reduced freshwater flux we are nonetheless able to obtain different oceanic circulation evolutions, including some abrupt transitions between shut-down and active circulation states in the course of the deglaciation. The inclusion of a parameterisation for the sinking of brines around Antarctica also produces an abrupt recovery of the Atlantic meridional overturning circulation, absent in the reference experiment. The fast oceanic circulation recoveries lead to abrupt warming phases in Greenland. Our simulated ice sheet geometry evolution is in overall good agreement with available global reconstructions, even though the abrupt sea level rise at 14.6 ka is underestimated, possibly because the climate model underestimates the millennial-scale temperature variability. In the course of the deglaciation, large-scale grounding line instabilities are simulated both for the Eurasian and North American ice sheets. The first instability occurs in the Barents–Kara seas for the Eurasian ice sheet at 14.5 ka. A second grounding line instability occurs ca. 12 ka in the proglacial lake that formed at the southern margin of the North American ice sheet. With additional asynchronously coupled experiments, we assess the sensitivity of our results to different ice sheet model choices related to surface and sub-shelf mass balance, ice deformation and grounding line representation. While the ice sheet evolutions differ within this ensemble, the global climate trajectory is only weakly affected by these choices. In our experiments, only the abrupt shifts in the oceanic circulation due to freshwater fluxes are able to produce some millennial-scale variability since no self-generating abrupt transitions are simulated without these fluxes. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 1814-9332 1814-9324 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d439ee838cae270c4e28bdd76746be17 https://cp.copernicus.org/articles/17/2179/2021/cp-17-2179-2021.pdf |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....d439ee838cae270c4e28bdd76746be17 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 18149332 18149324 |
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