Hello,
I am running several WRF sensitivity simulations with four nested domains. All simulations use the same initial and boundary conditions, land-surface configuration, modified snow fields, land use, LAI, topography, microphysics, cumulus scheme, radiation schemes, and other physics settings. The main differences between the simulations are the PBL and surface-layer schemes.
In a group of simulations, I enabled:
swint_opt = 2 , couple_farms = .true.,
These runs stopped during the simulation. In several cases, the model terminated with:
STOP Error: Longwave radiation budget problem in NoahMP LSM
Other runs stopped with a segmentation fault at approximately the same simulation time.
Because this behavior appeared repeatedly, I suspected that the combination of swint_opt = 2 and couple_farms = .true., might be involved.
To test this, I started another simulation that is otherwise identical to one of the failed runs, including the same PBL scheme, surface-layer scheme, Noah-MP configuration, modified snow fields, domains, and other physics options. The only relevant change was:
swint_opt = 2, couple_farms = .false.,
This simulation has passed the time at which the corresponding run with couple_farms = .true. failed and is still running.
Therefore, it appears that the problem occurs when FARMS is enabled with swint_opt = 2 and its shortwave radiation is coupled to the land-surface model through couple_farms = .true.,
Could you please clarify why this combination might cause instability or a Noah-MP longwave radiation budget error?
In particular, I would like to understand whether there are known compatibility issues or limitations associated with:
swint_opt = 2, couple_farms = .true., sf_surface_physics = 4 ; Noah-MP, ra_sw_physics = 4 ; RRTMG shortwave, ra_lw_physics = 4 ; RRTMG longwave,
and whether the surface shortwave flux passed from FARMS to Noah-MP could lead to unrealistic surface temperatures or an inconsistent surface energy budget, eventually triggering the Noah-MP longwave radiation budget check.
For additional information, I have attached the full namelist.input, and the relevant rsl.error and rsl.out files from the failed simulation.
Thank you very much for your help.
I am running several WRF sensitivity simulations with four nested domains. All simulations use the same initial and boundary conditions, land-surface configuration, modified snow fields, land use, LAI, topography, microphysics, cumulus scheme, radiation schemes, and other physics settings. The main differences between the simulations are the PBL and surface-layer schemes.
In a group of simulations, I enabled:
swint_opt = 2 , couple_farms = .true.,
These runs stopped during the simulation. In several cases, the model terminated with:
STOP Error: Longwave radiation budget problem in NoahMP LSM
Other runs stopped with a segmentation fault at approximately the same simulation time.
Because this behavior appeared repeatedly, I suspected that the combination of swint_opt = 2 and couple_farms = .true., might be involved.
To test this, I started another simulation that is otherwise identical to one of the failed runs, including the same PBL scheme, surface-layer scheme, Noah-MP configuration, modified snow fields, domains, and other physics options. The only relevant change was:
swint_opt = 2, couple_farms = .false.,
This simulation has passed the time at which the corresponding run with couple_farms = .true. failed and is still running.
Therefore, it appears that the problem occurs when FARMS is enabled with swint_opt = 2 and its shortwave radiation is coupled to the land-surface model through couple_farms = .true.,
Could you please clarify why this combination might cause instability or a Noah-MP longwave radiation budget error?
In particular, I would like to understand whether there are known compatibility issues or limitations associated with:
swint_opt = 2, couple_farms = .true., sf_surface_physics = 4 ; Noah-MP, ra_sw_physics = 4 ; RRTMG shortwave, ra_lw_physics = 4 ; RRTMG longwave,
and whether the surface shortwave flux passed from FARMS to Noah-MP could lead to unrealistic surface temperatures or an inconsistent surface energy budget, eventually triggering the Noah-MP longwave radiation budget check.
For additional information, I have attached the full namelist.input, and the relevant rsl.error and rsl.out files from the failed simulation.
Thank you very much for your help.