Hysteresis of the Antarctic Ice Sheet With a Coupled Climate‐Ice‐Sheet Model
Abstract The stability of the Antarctic ice sheet under different fixed CO2 levels and orbital configurations is explored using a coupled climate‐ice sheet model, starting from either a pre‐industrial ice sheet or an ice‐free, isostatically rebounded geometry. Simulations reveal a strong hysteresis...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-03-01
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| Series: | Geophysical Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2024GL111492 |
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| author | G. Leloup A. Quiquet D. M. Roche C. Dumas D. Paillard |
| author_facet | G. Leloup A. Quiquet D. M. Roche C. Dumas D. Paillard |
| author_sort | G. Leloup |
| collection | DOAJ |
| description | Abstract The stability of the Antarctic ice sheet under different fixed CO2 levels and orbital configurations is explored using a coupled climate‐ice sheet model, starting from either a pre‐industrial ice sheet or an ice‐free, isostatically rebounded geometry. Simulations reveal a strong hysteresis effect: equilibrium ice volumes differ significantly for equivalent CO2 levels, depending on the initial ice sheet geometry. Crucially, the albedo‐melt feedback is accounted for in our coupled setting, resulting in a nonlinear response of the ice sheet to the CO2 forcing. Critical CO2 thresholds trigger either the complete Antarctic ice sheet loss or near‐complete regrowth. The orbital configuration influences these CO2 thresholds. These findings highlight the importance of ice sheet‐atmosphere interactions, notably the albedo‐melt feedback, in projecting future long‐term ice sheet behavior. Neglecting these feedbacks could lead to an overestimation of CO2 thresholds for ice sheet destabilization, with implications for future long‐term sea level rise under high emission scenarios. |
| format | Article |
| id | doaj-art-946191a8f09f4b7cb3fdb06ae057a62d |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-946191a8f09f4b7cb3fdb06ae057a62d2025-08-20T03:52:42ZengWileyGeophysical Research Letters0094-82761944-80072025-03-01525n/an/a10.1029/2024GL111492Hysteresis of the Antarctic Ice Sheet With a Coupled Climate‐Ice‐Sheet ModelG. Leloup0A. Quiquet1D. M. Roche2C. Dumas3D. Paillard4Laboratoire des Sciences du Climat et de l’Environnement LSCE/IPSL CEA‐CNRS‐UVSQ Université Paris‐Saclay Gif‐sur‐Yvette FranceLaboratoire des Sciences du Climat et de l’Environnement LSCE/IPSL CEA‐CNRS‐UVSQ Université Paris‐Saclay Gif‐sur‐Yvette FranceLaboratoire des Sciences du Climat et de l’Environnement LSCE/IPSL CEA‐CNRS‐UVSQ Université Paris‐Saclay Gif‐sur‐Yvette FranceLaboratoire des Sciences du Climat et de l’Environnement LSCE/IPSL CEA‐CNRS‐UVSQ Université Paris‐Saclay Gif‐sur‐Yvette FranceLaboratoire des Sciences du Climat et de l’Environnement LSCE/IPSL CEA‐CNRS‐UVSQ Université Paris‐Saclay Gif‐sur‐Yvette FranceAbstract The stability of the Antarctic ice sheet under different fixed CO2 levels and orbital configurations is explored using a coupled climate‐ice sheet model, starting from either a pre‐industrial ice sheet or an ice‐free, isostatically rebounded geometry. Simulations reveal a strong hysteresis effect: equilibrium ice volumes differ significantly for equivalent CO2 levels, depending on the initial ice sheet geometry. Crucially, the albedo‐melt feedback is accounted for in our coupled setting, resulting in a nonlinear response of the ice sheet to the CO2 forcing. Critical CO2 thresholds trigger either the complete Antarctic ice sheet loss or near‐complete regrowth. The orbital configuration influences these CO2 thresholds. These findings highlight the importance of ice sheet‐atmosphere interactions, notably the albedo‐melt feedback, in projecting future long‐term ice sheet behavior. Neglecting these feedbacks could lead to an overestimation of CO2 thresholds for ice sheet destabilization, with implications for future long‐term sea level rise under high emission scenarios.https://doi.org/10.1029/2024GL111492ice sheetclimatefeedbacksalbedomodeling |
| spellingShingle | G. Leloup A. Quiquet D. M. Roche C. Dumas D. Paillard Hysteresis of the Antarctic Ice Sheet With a Coupled Climate‐Ice‐Sheet Model Geophysical Research Letters ice sheet climate feedbacks albedo modeling |
| title | Hysteresis of the Antarctic Ice Sheet With a Coupled Climate‐Ice‐Sheet Model |
| title_full | Hysteresis of the Antarctic Ice Sheet With a Coupled Climate‐Ice‐Sheet Model |
| title_fullStr | Hysteresis of the Antarctic Ice Sheet With a Coupled Climate‐Ice‐Sheet Model |
| title_full_unstemmed | Hysteresis of the Antarctic Ice Sheet With a Coupled Climate‐Ice‐Sheet Model |
| title_short | Hysteresis of the Antarctic Ice Sheet With a Coupled Climate‐Ice‐Sheet Model |
| title_sort | hysteresis of the antarctic ice sheet with a coupled climate ice sheet model |
| topic | ice sheet climate feedbacks albedo modeling |
| url | https://doi.org/10.1029/2024GL111492 |
| work_keys_str_mv | AT gleloup hysteresisoftheantarcticicesheetwithacoupledclimateicesheetmodel AT aquiquet hysteresisoftheantarcticicesheetwithacoupledclimateicesheetmodel AT dmroche hysteresisoftheantarcticicesheetwithacoupledclimateicesheetmodel AT cdumas hysteresisoftheantarcticicesheetwithacoupledclimateicesheetmodel AT dpaillard hysteresisoftheantarcticicesheetwithacoupledclimateicesheetmodel |