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Multi-filter Rotating Shadowband Radiometers (MFRSRs) provide routine measurements of the aerosol op- tical depth ( ) at six wavelengths (0.415, 0.5, 0.615, 0.673, 0.870 and 0.94µm). The single-scattering albedo ($0) is typically estimated from the MFRSR measurements by as- suming the asymmetry parameter (g). In most instances, however, it is not easy to set an appropriate value of g due to its strong temporal and spatial variability. Here, we introduce and validate an updated version of our retrieval technique that allows one to estimate simultaneously $0 and g for different types of aerosol. We use the aerosol and radiative properties obtained during the Atmospheric Radiation Measurement (ARM) Program's Aerosol Inten- sive Operational Period (IOP) to validate our retrieval in two ways. First, the MFRSR-retrieved optical properties are compared with those obtained from independent surface, Aerosol Robotic Network (AERONET), and aircraft mea- surements. The MFRSR-retrieved optical properties are in reasonable agreement with these independent measurements. Second, we perform radiative closure experiments using the MFRSR-retrieved optical properties. The calculated broad- band values of the direct and diffuse fluxes are comparable ( 5 W/m 2 ) to those obtained from measurements.

Aerosol single-scattering albedo and asymmetry parameter from MFRSR observations during the ARM Aerosol IOP 2003