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Cldfra and Swdown relationship


New member
Hello everybody!!!

The subject, where I can find the relationship between Cldfrac and Swdown wrf variables??? Physically is clearly, but the apparently qualitative nature of cldfra and it's impact on swdwn is something I want to know!!! Any idea?? Thank you!!!
you can think as if the final GHI is a weighted mean of the clear sky and cloudy sky GHI where the weight is the cloud fraction.