"CLOUD OPTICAL THICKNESS FOR ICE" and "CLOUD OPTICAL THICKNESS FOR WATER" not present in output of WRF

[todor_Gai]

Hi, I am new to WRF and I want to obtain "CLOUD OPTICAL THICKNESS FOR ICE" (TAUCLDI) and "CLOUD OPTICAL THICKNESS FOR WATER" (TAUCLDC) from the WRF forecast. The problem is that the variables are not present in the WRF output.
I use WRF V4 and my namelist.input file for physics looks like this:

&physics                 
mp_physics               = 7,
ra_lw_physics            = 5,
ra_sw_physics            = 5,
radt                     = 10,
sf_sfclay_physics        = 1,
sf_surface_physics       = 2,
bl_pbl_physics           = 1,
bldt                     = 0,
cu_physics               = 0,
cudt                     = 5,
isfflx                   = 1,
ifsnow                   = 0,
icloud                   = 1,
surface_input_source     = 1,
num_soil_layers          = 4,
sf_urban_physics         = 0,
maxiens                  = 1,
maxens                   = 3,
maxens2                  = 3,
maxens3                  = 16,
ensdim                   = 144,
/

Can someone help me with the configuration of wrf so that the model outputs the variables ?
Thank you

 

[Ming Chen]

Please look at Registr.EM_COMMON, find the line below:

state real taucldc ikj misc 1 - r "TAUCLDC" "CLOUD OPTICAL THICKNESS FOR WATER"

change it to

state real taucldc ikj misc 1 - rh "TAUCLDC" "CLOUD OPTICAL THICKNESS FOR WATER"

Please do the same for TAUCLDI.

Then type ./clean -a and recompile WRF.

 

[todor_Gai]

Hi Ming Chen , thank you for the clear answer. I did what you've described and now the vars are available in the output from WRF.

The strange thing is that all the values are zeros. Is it possible that some more data must be provided to the model in order to make
forecast for the variables. Currently I am using the GRIB data from
https://www.ncei.noaa.gov/data/global-forecast-system/access/grid-004-0.5-degree/forecast/

I am particularly interested in cloud forecasting.

Thank you