branch run of CAM4.0

[weili@psu_edu]

Hi CAM users,

I tried to run a branch run of CAM4.0 starting from year 1, year 2.. of the control run, but using a perturbed sst field. The model stopped running due to this problem:

cice ymd= 101 cice tod= 1800
sync ymd= 10101 sync tod= 1800
(shr_sys_abort) ERROR: ice_run_mct:: Internal sea-ice clock not in sync with Sync Clock
(shr_sys_abort) WARNING: calling shr_mpi_abort() and stopping

Anyone can help? I can provide more detailed namelist information if it is necessary.

Thanks.

 

[eaton]

What you're trying to do sounds reasonable. It's probably a mistake in setting up the namelist for the branch run. To do a branch run you should just need to specify a consistent set of restart files from the point where you want to branch. Please do provide more details about how you're setting up the namelist.

 

[weili@psu_edu]

Thank you for help eaton. Seems my namelist is too long to be posted. Is there any other way that I can send you the namelist?

Thanks.

 

[eaton]

The best thing would be to post the configure and build-namelist commands that you used to generate the namelists. Also, if you did any hand editing of the namelists produced by build-namelist then describe those changes as well.

 

[weili@psu_edu]

Thank you eaton. Actually the problem has been solved.

 

[lappen7@gmail_com]

I am having this exact problem. I cant figure out from this discussion what was done to solve the problem. Any help
clarifying this would be appreciated.

Cara-Lyn

 

[eaton]

Here is a sample build-namelist command for the ccsm4_0 release code. It includes just the settings that are relevent to specifying the restart datasets needed for a branch run. The filenames are specified in the form of the default restart files produced by a model run. $rundir is the location of the files. $case is the name of the case for the run that produced the restart files. $brstrt is the string that specifies the branch start time, for example, 0000-01-02-00000.

% build-namelist  
        -cice_nl "&ice ice_ic='$rundir/$case.cice.r.$brstrt.nc' /" 
        -namelist "&atm_in start_type='branch' 
         restart_file='$rundir/$case.cpl.r.$brstrt.nc' 
         cam_branch_file='$rundir/$case.cam2.r.$brstrt.nc' 
         dom_branch_file='$rundir/$case.camdom.r.$brstrt' 
         nrevsn='$rundir/$case.clm2.r.$brstrt.nc' /"