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Hi,
If you output the variable RMOL, which will give the inverse of the Monin-Obukhov length, so you could calculate it from that.
This variable is not currently set to output in the history files. There are 2 ways to turn it on:
1) Modify the WRF/Registry/Registry.EM_COMMON file. In this line:
Code:
state real RMOL ij misc 1 - r "RMOL" "1./Monin Ob. Length" ""
You'll need to add an 'h' for 'history in the I/O column, so that it reads:
Code:
state real RMOL ij misc 1 - rh "RMOL" "1./Monin Ob. Length" ""
The downfall with this option is that you will have to clean, reconfigure, and recompile the model.
2) A simpler option may be to use the Runtime I/O option. You can read more about that here:
http://www2.mmm.ucar.edu/wrf/users/docs/user_guide_v4/v4.0/users_guide_chap5.html#runtimeio
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