A recipe for using analytic_ic's

In your case directory,

./xmlchange CAM_CONFIG_OPTS=' -analytic_ic' --append

and the in the user_nl_cam file, set:

analytic_ic_type = 'us_standard_atmosphere' use_topo_file = .true.

Do not comment out the ncdata file pointing to the (unstable) inic's --- CAM needs an ncdata file to provide the vertical grid.

You then will probably need to rebuild the model due to the change to CAM_CONFIG_OPTS.

From Adam Herrington (October 22, 2024)