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Prescribing cloud cover

I am trying to modify the source code for a CAM3+SOM setup to prescribe low cloud cover for the duration of the simulation. My initial guess was to search for all instances of "CLDST" and then to insert a line of code that reads in the prescribed cloud fraction from an input file. How would I go about doing this?
 

eaton

CSEG and Liaisons
I'd be tempted to modify cldst at the point where the model calculates it, which is in subroutine cldfrc (in cloud_fraction.F90). Disclaimer: I have no idea whether it makes sense scientifically to do this.
 
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