Initialization and bootstrapping

There are three ways to start PISM:

• option -i reads a previously-saved “complete” PISM model state from a NetCDF file, or

• option -i -bootstrap reads an “incomplete” NetCDF file and uses heuristics to fill in needed fields, or

• pism -eisII ... and the pism -test ... are used to initialize simplified-geometry experiments and verification tests from formulas in the source code, and thus no input file is required.

Modeling usually starts with the -i input.nc -bootstrap because real ice sheet observations are never complete initial conditions. Runs with multiple stages often use the -i option after the first stage.

• Initialization from a saved model state
  • -i file format
• Bootstrapping
  • -bootstrap file format

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