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Shortwave, Clear-Sky Diffuse Irradiance in the 350 to 1050 nm Range: Comparison of Models with RSS Measurements at the Southern Great Plains ARM Site in September/October 2001

A rotating shadowband spectroradiometer (RSS) operating in the spectral range between 350 to 1050 nm obtained measurements of direct and diffuse components of spectral irradiance during the first diffuse irradiance IOP in the autumn of 2001. Independent measurements of the primary inputs to spectral irradiance models, including aerosol optical depth, water vapor column, and ozone column measurements, were used. A parameterized spectral surface albedo based on filter measurements provided realistic surface reflectance as a further input to the models. Plausible wavelength independent single scattering albedo and asymmetry parameter were assumed for the column based on in situ surface-based measurements typical of early autumn. Spectral irradiance measurements are compared to three models including, MODTRAN, SBDART, and SMARTS2.