I try to measure radiative forcing in northwestern Argentina using a NIP and PSP.
First, a PSP is extremely sensitive to thermal imbalance issues, so that its offset needs correction. See http://www.sciencedirect.com/science/article/pii/S0038092X08001813
Then, you need other sources of data, since you need to compare your measurements to what the surface radiation would be without aerosols. There is an abundance of publications on this topic. See e.g. https://www.researchgate.net/publication/249312655_Aerosol_properties_and_radiative_forcing_over_Kanpur_during_severe_aerosol_loading_conditions
You also need a measurement of aerosol optical characteristics from satellite remote sensing or (better) by a ground-based sunphotometer.
Article Aerosol properties and radiative forcing over Kanpur during ...
To quantify radiative forcing of aerosols, the way i look at this problem is first to have optical properties of aerosols over the study site using ground based sky-radiometer and then use aid of models OPAC and SBDART to compute aerosol radiative forcing or forcing efficiency (change in radiative forcing per unit increase in aerosol optical depth: only clear sky observations to minimize the error and see the affect is only due to aerosols). If a ground be based pyranometer is at the study site one can always calculate the change in total solar flux for the increase in aerosol loading (applying zenith angle correcting) for which the slope will give aerosol forcing efficiency a diurnal average for all the respective hours will be the average forcing efficiency. this can be compared with the standard models of OPAC to quantify the forcing for the place. The CERES satellite observations of the outgoing flux will also be helpful (for clear sky days). This is my opinion and i agree with chris. I don't know about PSP or NIP (but the reference chris provided will be helpful).
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