The research team will investigate past, present and future interactions between the Greenland ice sheet (GrIS) and the climate system with the Community Earth System Model (CESM, www2.cesm.ucar.edu) coupled to the Community Ice Sheet Model version 2 (CISM2,oceans11.lanl.gov/cism/index.html). CESM is a global climate model capable of realistic simulation of GrIS surface mass balance, including explicit calculations of melt and refreezing. The offered projects will participate in the International Model Intercomparison Project 6 (ISMIP6).