MOM6 restart file generation issue

[paulhall]

Using CESM (cesm2_3_alpha16g) out of the box (unmodified) on derecho with a CMOM compset, if I create a run with a duration that is a fraction of a day, the time indicated by the name of the restart file for MOM6 does not match the time of the names of the other components. For example, the restart files generated for a case with STOP_OPTION=nhours, STOP_N=23 are:

c.23a16g.CMOM.T62_t061.restart.023.cpl.r.0001-01-01-82800.nc
c.23a16g.CMOM.T62_t061.restart.023.datm.r.0001-01-01-82800.nc
c.23a16g.CMOM.T62_t061.restart.023.mom6.r.0001-01-01-00000.nc
c.23a16g.CMOM.T62_t061.restart.023.dice.r.0001-01-01-82800.nc
c.23a16g.CMOM.T62_t061.restart.023.drof.r.0001-01-01-82800.nc

For a case with STOP_OPTION=nhours, STOP_N=25, the restart files that are generated are:
c.23a16g.CMOM.T62_t061.restart.025.cpl.r.0001-01-02-03600.nc
c.23a16g.CMOM.T62_t061.restart.025.datm.r.0001-01-02-03600.nc
c.23a16g.CMOM.T62_t061.restart.025.mom6.r.0001-01-02-00000.nc
c.23a16g.CMOM.T62_t061.restart.025.dice.r.0001-01-02-03600.nc
c.23a16g.CMOM.T62_t061.restart.025.drof.r.0001-01-02-03600.nc

It appears that the MOM6 component writes out a restart file for the start of the current day, rather than for the actual time of the final timestep. As a result, the short-term archiver does not move the MOM6 restart file to the restart directory in the archive location (though the other restart files do appear there).

Is there a MOM6 setting that I need to adjust to get restart files for times intervals of fractions of a day? Or is this a fixed limit?

Thanks in advance for any advice on this!
Paul

CESM version: cesm2_3_alpha16g-0-g47ebedb
compset: CMOM
grid: T62_t061

 

[altuntas]

Hi Paul,
The following PR's should resolve this issue. Please let us know if the issue persists:

Fix intraday CESM restart file names by alperaltuntas · Pull Request #267 · NCAR/MOM6

This PR fixes intraday CESM restart file names. Note that, to short-term archive interim restart fiesl, DOUT_S_SAVE_INTERIM_RESTART_FILES xml variable must be set to True. This PR should be evaulat...

github.com

Add rpointer_content entry in config_archive.xml by alperaltuntas · Pull Request #155 · ESCOMP/MOM_interface

This PR fixes a short term archiver issue that occurs whenDOUT_S_SAVE_INTERIM_RESTART_FILES is set to True.

github.com

Note that in MOM6, the intervals for history averaging are reset each time the model is restarted. For instance, if you restart the model at 06:00, the daily averages will be calculated from 06:00 to 06:00 the following day (unlike the remaining CESM models.)

 

[paulhall]

That's great! I'll give it a try. Thanks Alper!