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LADNMASK was restored after running real.exe

xpji

New member
hi, all

To make an ideal experiment with a surface covered by water, I changed HGT_M in geogrid.*nc to 0, LANDMASK to 0, and LU_INDEX to 16 through "read_wrf_nc.f90".
The above three variables in the met*nc file obtained by successfully running metgrid.exe are also consistent.

1705565801391.png1705565826272.png1705565852610.png


However, when I run real.exe, the HGT and LU_INDEX in the generated wrfinput_d01 remain unchanged, while LANDMASK was changed.

1705566034835.png

In addition, when I run wrf.exe, the LU_INDEX in the generated wrfoutput*file also changed.

1705566134324.png



Is this normal? Can it always remain the same?

geogrid.nc

met.nc

wrfinput_d01
 

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Hi,
I would like to apologize for the long delay in response. Between holidays, unplanned time out of the office, the AMS conference, and planning for our WRF tutorial taking place this week, we got pretty behind on forum questions. Thank you so much for your patience.

Are you still experiencing issues with this?
 
Hi,
I would like to apologize for the long delay in response. Between holidays, unplanned time out of the office, the AMS conference, and planning for our WRF tutorial taking place this week, we got pretty behind on forum questions. Thank you so much for your patience.

Are you still experiencing issues with this?
Hi,
Yes, can you explain what causes this? Will this have a big impact on my ideal experiment results?
 
It looks like you used MODIS landuse data, and for that dataset, 17 is the value for a water point. Therefore, if you set lu_index=16 but set landmask = 0, then, based on the lu_index, the points are not considered to be water, though they are water, based on landmass. In this case, the real.exe program will adjust the two fields to make them consistent. Try changing the lu_index to 17, instead of 16 and see if that makes a difference.

An alternative, and perhaps easier method, may be to simply adjust all the values in the wrfinput file, instead - after real.exe is run.
 
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