Land cover LU_INDEX changed after wrf.exe run --WRF V3.9.1.1

[Chang_Shu]

Hello,

We are doing a 1 km resolution 3 domain nested simulation for the Ottawa area.
However, we found the LU_INDEX in the WRF output file came to be large pixels, which is different from that in the geo_em.d03.nc and met_em.d03.*.nc files.
Please find the plots for LU_INDEX in geo_em, met_em and wrfout files below.

LU_INDEX in geo_em.d03.nc


LU_INDEX in met_em.d03.*.nc


It seems reasonable with fine land cover resolution in the above two figures.
So I suppose the preprocessing programs (geogrid.exe and metgrid.exe) are running well.

But after wrf.exe run, the LU_INDEX changed to large pixels:
LU_INDEX in wrfout.d03.*.nc


The static geographical data we are using is the MODIS default configuration.
As specified in the namelist.wps file:

&geogrid
 parent_id         =   1,   1,    2,  
 parent_grid_ratio =   1,   3,    3,   
 i_parent_start    =   1,   99,   57,  
 j_parent_start    =   1,  106,   73,   
 e_we              = 276, 250,  391,  
 e_sn              = 296, 283,  364, 
 geog_data_res     = 'modis_30s+2m','modis_30s+30s','modis_30s+30s',

The version of the WRF we are using is WRF V3.9.1.1.


Could anyone please let me know if it is normal that the LU_INDEX distribution changes in the WRF output file?
And how can we avoid this problem in WRF V3.9.1.1?

Thanks!

 

[kwerner]

Hi,
Can you also attach your namelist.input file and let me know which type of input data you are using? Thanks!

 

[Chang_Shu]

Hello, kwerner
Thanks for your reply!
Please find the namelist.input in the attachment.
We are using NCEP North American Regional Reanalysis (NARR) ds608.0 as inputs.

 

[kwerner]

Thanks. Can you change "surface_input_source" to 3 and re-run real.exe and then wrf.exe, and let me know if that makes a difference?

 

[Chang_Shu]

Hello,
I have tried to change surface_input_source = 3. But it did not work.

I changed the line
input_from_file = .true.,.false.,.false.,
to
input_from_file = .true.,.true.,.true.,

Then the result seems good!
Thanks for the help!

Chang