Model Setup of Thwaites Glacier

We set up our Thwaites model to study its evolution in the next 100 years. We use BEDMAP-2 data for ice surface elevation and ice shelf draft elevation (Fretwell et al., 2013). We apply the bed elevation from mass conservation on grounded ice (Morlighem et al., 2011, 2013) and the sea floor bathymetry from a gravity inversion beneath floating ice (Millan et al., 2017). We use the surface mass balance data from RACMO 2.3 (Lenaerts and van den Broeke, 2012). We conduct inversion for the basal friction coefficient and ice shelf rheology to match modeled velocity with observed surface velocity. The modeling study is done with the Ice Sheet System Model that can be found and downloaded at https://issm.jpl.nasa.gov/ Retreat of Thwaites Glacier, West Antarctica, over the next 100 years using various ice flow models, ice shelf melt scenarios and basal friction laws, The Cryosphere Discussion (submitted)