Restarting the Coupled Model

Restart Control Parameters and Settings

	FV3	CMEPS	MOM6	CICE6	WW3
restart control: creating a restart during model run	model_configure: restart_interval. Give the value in hours. Set 0 to write a restart only at the end.	nems.configure: restart_n and restart_option. For example, use restart_n = 48 and restart_option = nhours to write a restart every 48 hours	nems.configure: restart_n and restart_option	nems.configure: restart_n and restart_option
restart filenames	checkpoint restarts are named timestamp.filename.nc. Final restarts are named filename.nc	ufs.s2s.cpl.r.timestamp.nc	checkpoint restarts are named MOM.res.timestampX.nc, where X=(none,_1,_2 etc) depending on file size. Final restarts are named MOM.resX.nc	iced_timestamp.nc
restart write location	RESTART	RESTART. Controlled in nems.configure using case_name = ./RESTART/ufs.s2s	RESTART. Controlled in MOM_input_nml (located in input.nml) using restart_output_dir = 'RESTART/'	RESTART. Controlled in ice_in, using restart_dir = ./RESTART
input location for restart runs	INPUT	INPUT. Use rpointer.cpl in run directory to specify filename and location	INPUT. Use restart_input_dir in MOM_input_nml (located in input.nml) to specify location	INPUT. Use ice.restart_file in run directory to specify filename and location
input files for restart runs	coupler.res fv_core.res.nc fv_core.res.tile[1-6].nc fv_srf_wnd.res.tile[1-6].nc fv_tracer.res.tile[1-6].nc phy_data.tile[1-6].nc sfc_data.tile[1-6].nc	ufs.s2s.cpl.r.timestamp.nc rpointer.cpl where timestamp is the time of the restart. The file name and path is stored in rpointer.cpl for use when restarting the model.	MOM.res_1.nc MOM.res_2.nc MOM.res_3.nc MOM.res.nc Note the actual number of files depends on MOM6 resolution. For 1 deg and 1/2 deg, there is a single MOM.res.nc restart file. For 1/4 deg, there are 4 MOM.res().nc files.	iced.timestamp.nc ice.restart_file where timestamp is the time of the restart. The file name and path is stored in ice.restart_file for use when restarting the model.
restart trigger	Set fhrot as described below and set input.nml parameters: warm_start =.T. make_nh =.T. na_init = 0 external_ic = F nggps_ic = F mountain = .T.	Set start_type = continue in nems.configure	Set input_filename ='r' in MOM_input_nml (located in input.nml). MOM6 will expect a restart file with root name MOM.res in INPUT	Set runtype ='continue' and use_restart_time =.true. in ice_in

Model Configure and fhrot

1 day run: 2012-01-01-00 → 2012-01-02-00	1 day run: 2012-01-02-00 → 2012-01-03-00
model configure: start_year: 2012 start_month: 01 start_day: 01 start_hour: 00 start_minute: 0 start_second: 0 nhours_fcst: 24 restart_interval: 24 fhrot: 0	model configure: start_year: 2012 start_month: 01 start_day: 01 start_hour: 00 start_minute: 0 start_second: 0 nhours_fcst: 48 restart_interval: 24 fhrot: 24
In nems.configure, set: stop_n = 24 restart_n = 24 restart_option = nhours start_type = startup	In nems.configure, set: stop_n = 24 restart_n = 24 restart_option = nhours start_type = continue