Hi all,
I’m running a default CESM2 case with F2000climo compset, and I’m trying to assess spin-up stability using Keith Oleson’s script SpinupStability_SP_v10.ncl. I’m surprised that after a 20-year run, several global variables still fail the equilibrium tests unless I loosen thresholds. I focused on three variables: FSH, EFLX_LH_TOT, and GPP. When I set glob_thresh_fsh to 0.06, glob_thresh_lh to 0.06, and glob_thresh_gpp to 0.18, these three variables are in equilibrium. I’d appreciate guidance on whether this is expected for F2000climo and how best to proceed.
case basics:
CESM version: cesm2.1.4
Compset: F2000climo
Run length: 20 years
Output: monthly
case build up code:
./create_newcase --case /glade/u/home/dyang/cases/F_ref --res f09_f09_mg17 --compset F2000climo --project WYOM0195
./xmlchange --subgroup case.run JOB_WALLCLOCK_TIME=06:00:00
./xmlchange INFO_DBUG=3,STOP_N=2,STOP_OPTION=nyears,RESUBMIT=4
./case.setup
vi user_nl_cpl
histaux_a2x3hr = .true.
vi user_nl_clm
hist_nhtfrq = 0
hist_mfilt = 1
vi user_nl_cam
mfilt = 1
nhtfrq = 0
./preview_namelists
./case.build
./case.submit
./xmlchange CONTINUE_RUN=TRUE
./xmlchange STOP_N=2,STOP_OPTION=nyears,RESUBMIT=4
./case.submit
I set subper to 4 and ran the script SpinupStability_SP_v10.ncl, and the result is shown in the attached image.
My questions:
1. Do I need to explicitly specify RUN_STARTDATE as 2000 to avoid a cold start? I didn't specify RUN_STARTDATE when creating the case. Will this cause the case to become a cold start, which takes longer to spin up?
2. Do I need to run a new case with the F2000climo compset and specify the RUN_STARTDATE as 2000-01-01 to shorten the spinup? I read the CTSM manual on spinups, which says that the variables are basically in equilibrium after about 10 years run.
Thanks! Any insights and recommended spin-up strategies would be greatly appreciated.
I’m running a default CESM2 case with F2000climo compset, and I’m trying to assess spin-up stability using Keith Oleson’s script SpinupStability_SP_v10.ncl. I’m surprised that after a 20-year run, several global variables still fail the equilibrium tests unless I loosen thresholds. I focused on three variables: FSH, EFLX_LH_TOT, and GPP. When I set glob_thresh_fsh to 0.06, glob_thresh_lh to 0.06, and glob_thresh_gpp to 0.18, these three variables are in equilibrium. I’d appreciate guidance on whether this is expected for F2000climo and how best to proceed.
case basics:
CESM version: cesm2.1.4
Compset: F2000climo
Run length: 20 years
Output: monthly
case build up code:
./create_newcase --case /glade/u/home/dyang/cases/F_ref --res f09_f09_mg17 --compset F2000climo --project WYOM0195
./xmlchange --subgroup case.run JOB_WALLCLOCK_TIME=06:00:00
./xmlchange INFO_DBUG=3,STOP_N=2,STOP_OPTION=nyears,RESUBMIT=4
./case.setup
vi user_nl_cpl
histaux_a2x3hr = .true.
vi user_nl_clm
hist_nhtfrq = 0
hist_mfilt = 1
vi user_nl_cam
mfilt = 1
nhtfrq = 0
./preview_namelists
./case.build
./case.submit
./xmlchange CONTINUE_RUN=TRUE
./xmlchange STOP_N=2,STOP_OPTION=nyears,RESUBMIT=4
./case.submit
I set subper to 4 and ran the script SpinupStability_SP_v10.ncl, and the result is shown in the attached image.
My questions:
1. Do I need to explicitly specify RUN_STARTDATE as 2000 to avoid a cold start? I didn't specify RUN_STARTDATE when creating the case. Will this cause the case to become a cold start, which takes longer to spin up?
2. Do I need to run a new case with the F2000climo compset and specify the RUN_STARTDATE as 2000-01-01 to shorten the spinup? I read the CTSM manual on spinups, which says that the variables are basically in equilibrium after about 10 years run.
Thanks! Any insights and recommended spin-up strategies would be greatly appreciated.
