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Synchronized sun-photometric measurements from the AERONET-CIMEL (AErosolRObotic NETwork) and GAW-PFR (Global Atmospheric Watch–Precision Filter Radiometer)aerosol networks are used to compare retrievals of the aerosol opticaldepth (AOD), effective radius, and volume concentration during a high-temporal-resolutionmeasurement campaign at the Athens site in the MediterraneanBasin from 14 to 22 July 2009. During this period, direct-sun AOD retrievalsfrom both instruments exhibited small differences in the range 0.01–0.02.The AODs measured with CIMEL and PFR instruments were inverted to retrieveparticle microphysical properties using the linear estimation (LE) technique. Forlow aerosol loads (AOD < 0.2), measurements of the effective radiusby the PFR were found to be −20% to +30% different from CIMEL valuesfor both direct-sun data and inversion data. At higher loads(AOD > 0.4), measurements of the effective radius by the PFR areconsistently 20 % lower than CIMEL for both direct-sun and inversion data.Volume concentrations at low aerosol loads from the PFR are up to 80%higher than the CIMEL for direct-sun data but are up to 20% lower whenderived from inversion data under these same conditions. At higher loads,the percentage difference in volume concentrations from the PFR and CIMEL issystematically negative, with inversion data predicting differences 30%lower than those obtained from direct-sun data.  An assessment of the effect of errors in the AOD retrieval on the estimationof PFR bulk parameters was performed and demonstrates that it is possible toestimate the particle volume concentration and effective radius with anuncertainty  < 65% when AOD < 0.2 and when input errors areas high as 10%

Aerosol microphysical retrievals from precision filter radiometer direct solar radiation measurements and comparison with AERONET