Supposing that I have mass concentration profile data of different aerosol species (dry state) along with RH profile from a chemical transport model (CTM). This CTM do have an internal aerosol routine which calculated AOD & SSA. In order to compute aerosol radiative forcing (ARF), one required scatter phase function or asymmetry parameter in addition to AOD & SSA values. Of course, I am aware that atmospheric profile data & surface reflectance information are also needed, which can be obtained respectively from radiosondes (alternately use climatological atmospheric profile that corresponds to the region of study) and MODIS. As per the above description of available data, I chose to use OPAC (assumption of external mixing) to compute the aerosol optical and scattering properties by using mass concentration data of different species. Once I have AOD, SSA and g, I was using the SBDART to compute ARF. 

My main questions are:

(a) Are there studies focused on giving a detailed uncertainty estimate combining all sources of uncertainty from measurements/model simulations till radiative forcing computation (say using offline RT model)?

(b) Is there any study which give the uncertainty in ARF computation by using asymmetry parameter instead of scattering phase function?

(c) What is the uncertainty of a general chemical transport model simulations of aerosol species mass concentrations?