Dust direct radiative effect in CAM4

Hi,I am interested in how dust concentration changes would affect the local (direct) radiative forcing, and thus the atmospheric circulation and precipitation. To mimic the dust concentration changes, I am thinking of a more idealized approach by modifying the radiative properties of dust, such as any model coefficients associated with the scattering, reflection, or absorption processes. Does anyone have suggestions on what kind of coefficients I can probably modify?Thanks in advance,Shineng
 
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