[Wrf-users] question on diagnosed cloud fractions in WRF-NMM

[Case, Jonathan (MSFC)]

Dear WRF community,

 

I was wondering how the diagnosed cloud fractions are calculated in the
WRF-NMM?  

 

I've noticed that there are low, mid, and high cloud fractions (cfracl,
cfracm, and cfrach).  

I figure there must be embedded code that empirically assigns a cloud
fraction based on a minimum cloud mixing ratio threshold, and a range of
z-levels that pre-defines the low, mid, and high layers, but I have not
yet found it in the WRF-NMM code.  

 

For those with this familiarity, could you point me to the source code
where this is determine/defined?  

What are the heights of the layers that correspond to low, mid, and
high, and the minimum mixing ratio threshold used?  

Finally,  is there a citation that could be referenced for this
information.

 

Your assistance is greatly appreciated.

Jonathan

 

*********************************************************** 
Jonathan Case, ENSCO, Inc. 
Aerospace Sciences & Engineering Division 
Short-term Prediction Research and Transition Center 
320 Sparkman Drive, Room 3062 
Huntsville, AL 35805-1912 
Voice: (256) 961-7504   Fax: (256) 961-7788 
Emails: Jonathan.Case at nsstc.nasa.gov
<mailto:Jonathan.Case at nsstc.nasa.gov>   
              case.jonathan at ensco.com <mailto:case.jonathan at ensco.com>  
*********************************************************** 

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