initMIP-Antarctica: an ice sheet model initialization experiment of ISMIP6

摘要: Ice sheet numerical modeling is an important tool to estimate the dynamic contribution of Antarctic ice sea level rise over coming centuries. The influence initial conditions on model simulations, however, still unclear. To better understand this influence, state intercomparison exercise (initMIP) has been developed compare, evaluate, and improve initialization procedures their impact century-scale simulations. initMIP first set experiments Sheet Model Intercomparison Project for CMIP6 (ISMIP6), which primary Coupled Phase 6 (CMIP6) activity focusing Greenland sheets. Following initMIP-Greenland, initMIP-Antarctica designed explore uncertainties associated with spin-up evaluate changes in external forcings. Starting from at end procedure, three forward are each run 100 years: a control run, surface mass balance anomaly, basal melting anomaly beneath floating ice. This study presents results 25 simulations performed by 16 international groups. submitted use different methods, as well flow parameters reference We find good agreement among responses but large variations anomaly. These can be attributed differences extent shelves upstream tributaries, treatment grounding line, ocean applied, suggesting that ongoing efforts represent continental-scale models should continue.