CESM2.1.3 CISM CASEROOT Variable Definitions

Name of land ice-sheet component

TRUE implies CISM is built with support for the trilinos library
      When using the higher-order dynamical cores in CISM, one option is to
      use the trilinos solver library for sparse matrix solves. In order to
      exercise that option, you need to build CISM with trilinos support, and
      link to the trilinos libraries when building the CESM executable. Setting
      this variable to TRUE accomplishes these things. Note that you can set
      this to TRUE and still choose not to use the trilinos solvers for the
      sparse matrix solves. Also, note that trilinos is only available on a
      limited set of machines; this must remain FALSE to run CISM on a
      machine that does not have trilinos, or for which the CESM scripts are
      not aware of the existence of trilinos.

Version of CISM physics/dynamics to use

Whether CISM ice evolution is on or off.

     Setting CISM_EVOLVE to FALSE in a hybrid case also forces the use
     of observed initial conditions, as if you had also set
     CISM_OBSERVED_IC=TRUE.
     

For hybrid runs, whether CISM should use observed initial
    conditions instead of restart file.

    For hybrid runs, a value of FALSE (default) implies that CISM should
    use the restart file from the reference case; a value of TRUE
    implies that CISM should instead use the observed initial conditions
    that are generally used for startup runs. This variable is ignored
    for startup runs; for branch runs, it must be FALSE.

    Note that setting CISM_EVOLVE to FALSE in a hybrid case also forces
    the use of observed initial conditions, as if you had also set
    CISM_OBSERVED_IC=TRUE.