| Summary: | To demonstrate the viability of a precipitation regime change leading to a fundamentally different volume-to-area ratio of the Antarctic ice sheet, we deploy the 3D thermodynamical ice sheet/shelf model IMAU-ICE v1.1.1. In the standard set-up ( Stap et al., 2021a , 2021b ), climate forcing follows from pre-run warm and cold snapshot climate simulations. The applied climate forcing is transiently calculated based on the prescribed CO 2 concentration and the modelled ice sheet size, through a matrix interpolation method. Equilibrium experiments are performed at various CO 2 levels between preindustrial and 3x preindustrial CO 2 values, with insolation at present-day levels and initiated from an ice-free Miocene Antarctic topography (dataset Hochmuth et al., 2020 ). Here, we perform additional sensitivity experiments, in which we apply a fixed precipitation increase and extreme sub-shelf melt rates. The precipitation anomaly is calculated as 25% of the warm snapshot precipitation fields, sub-shelf melt rates are set to 400 m/yr. L.B. Stap is funded by the Dutch Research Council (NWO), through VENI grant VI.Veni.202.031. Simulations were performed on the Gemini computing cluster of the Faculty of Science, Utrecht University.
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