Changing Various Model Timesteps for Restart

[msl3v@virginia_edu]

Hello forum

Is it possible to run a CAM restart with a different atmosphere timestep than the runs used to generate the restart files?

I'd tried to do that but got an error & end_run:
" ocn_run_mct:: Internal SOM ocean model clock not in sync with Sync Clock"

All model timesteps were changed from 60 sec to 600 sec, for the restart, to cause this.

 

[hannay]

A restart run is basically an exact continuation of the run and you cannot modify the timestep.

See below: CAM documentation

In addition to initial simulations, there are two types of continuation runs: restart and
branch. A restart run is an exact continuation of a previous simulation from its point of
termination. Namelist variables other than NESTEP, NELAPSE, and NSREST should never
be modified for restart runs. A branch run, on the other hand, is a new case that uses
restart data from a previous simulation to begin the integration. Since a branch run is
a new case, the length of the history interval and the output history fields do not have
to be the same as in the control simulation. For example, the branching option can
be used to output selected fields more frequently than was the case in the control run.
Only history file namelist options should be modified for branch runs. If the
user desires to modify other options, such as physics control variables, a new initial run
should be done using initial datasets generated by the control run.