Issue with sf_surface_mosaic in WRF 4.6 (module_io_quilt_old.F error)

[ZHOU Wan]

Hello WRF Support Team,

I am using WRF version 4.6, and I encountered an issue when enabling the mosaic approach (sf_surface_mosaic). When I set sf_surface_mosaic to either 0 or 1, the model fails with the following error message:

module_io_quilt_old.F 2931 T
------ ERROR while reading namelist physics ------
Maybe here?: sf_urban_physics = 4, 4, 4,
Maybe here?: sf_surface_mosaic = 0, 0, 1,
-------------- FATAL CALLED ---------------
FATAL CALLED FROM FILE: <stdin> LINE: 11680
ERRORS while reading one or more namelists from namelist.input.
Abort(1) on node 0 (rank 0 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, 1) - process 0

After multiple attempts, I found that the model only runs successfully if I completely comment out sf_surface_mosaic in namelist.input. Below is my namelist configuration:

&physics
physics_suite = 'CONUS'
mp_physics = 6, 6, 6,
cu_physics = 1, 1, 0,
ra_lw_physics = 4, 4, 4,
ra_sw_physics = 4, 4, 4,
bl_pbl_physics = 1, 1, 1,
sf_sfclay_physics = 1, 1, 1,
sf_surface_physics = 4, 4, 4,
radt = 30, 30, 30,
bldt = 0, 0, 0,
cudt = 5, 5, 5,
icloud = 1,
num_land_cat = 61,
num_soil_layers = 4,
sf_urban_physics = 1, 1, 1,
! sf_surface_mosaic = 0, 0, 0,
! mosaic_cat = 3, 3, 3,

​

Questions:​

• Is sf_surface_mosaic officially supported in WRF 4.6?
• Are there any dependencies or conflicts with other physics options, such as sf_urban_physics or SF_surface_physics?
• Should sf_surface_mosaic be set consistently across all domains, or can it vary between nested domains?
• Are there additional settings or modifications required to enable the mosaic approach successfully?

Any guidance or suggestions would be greatly appreciated. Wish your early reply! Thank you!

 

[kwerner]

Hi,
The issue is that you have multiple settings for the sf_surface_mosaic parameter, and this parameter only accepts a single setting. You can either turn it on or off for the entire domain. To turn it on, please set "sf_surface_mosaic = 1."