CC BY 4.0 UnportedSun, SainanPattyn, FrankSimon, Erika G.Albrecht, TorstenCornford, StephenCalov, ReinhardDumas, ChristopheGillet-Chaulet, FabienGoelzer, GoelzerGolledge, Nicholas R.Greve, RalfHoffman, Matthew J.Humbert, AngelikaKazmierczak, EliseKleiner, ThomasLeguy, Gunter R.Lipscomb, William H.Martin, DanielMorlighem, MathieuNowicki, SophiePollard, DavidPrice, StephenQuiquet, AurélienSeroussi, HélèneSchlemm, TanjaSutter, Johannesvan de Wal, Roderik S.W.Winkelmann, RicardaZhang, Tong2021-11-112021-11-112020https://oa.tib.eu/renate/handle/123456789/7267https://doi.org/10.34657/6314Antarctica's ice shelves modulate the grounded ice flow, and weakening of ice shelves due to climate forcing will decrease their 'buttressing' effect, causing a response in the grounded ice. While the processes governing ice-shelf weakening are complex, uncertainties in the response of the grounded ice sheet are also difficult to assess. The Antarctic BUttressing Model Intercomparison Project (ABUMIP) compares ice-sheet model responses to decrease in buttressing by investigating the 'end-member' scenario of total and sustained loss of ice shelves. Although unrealistic, this scenario enables gauging the sensitivity of an ensemble of 15 ice-sheet models to a total loss of buttressing, hence exhibiting the full potential of marine ice-sheet instability. All models predict that this scenario leads to multi-metre (1-12 m) sea-level rise over 500 years from present day. West Antarctic ice sheet collapse alone leads to a 1.91-5.08 m sea-level rise due to the marine ice-sheet instability. Mass loss rates are a strong function of the sliding/friction law, with plastic laws cause a further destabilization of the Aurora and Wilkes Subglacial Basins, East Antarctica. Improvements to marine ice-sheet models have greatly reduced variability between modelled ice-sheet responses to extreme ice-shelf loss, e.g. compared to the SeaRISE assessments. Copyright © The Author(s) 2020.enghttps://creativecommons.org/licenses/by/4.0/550Antarctic glaciologyice shelvesice-sheet modellingArticle