Determination of ultraviolet cosine-corrected irradiances and aerosol optical thickness by combined measurements with a Brewer spectrophotometer and a multifilter rotating shadowband radiometer

摘要: Combined measurements of diffuse-to-global radiation ratio and global spectral irradiances in the UV are used to derive cosine-corrected aerosol optical depth (AOD). The is first cosine correction irradiance, then calculate absolutely calibrated direct irradiances. Beer-Lambert law applied AOD using independent extraterrestrial solar flux. can be derived with an uncertainty about 0.03 at 60° zenith angle. method was obtained two multifilter rotating shadowband radiometers (UV-MFRSRs) a MK III Brewer spectrophotometer on Island Lampedusa Central Mediterranean during periods 2002 2004. 318 332 nm compared measured 318, 320, 368 different techniques. retrieved AOD, combining MFRSR measurements, good agreement other methods.