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In this study, aerosol optical depth (AOD) measurements, from a MFR sunphotometer operating in Athens, were compared with columnar dust loadingestimations, from the BSC-DREAM model, during identified dust events, inorder to extract the typical specific extinction cross-section for dust overthe area. The selected urban environment of Athens provided us with theopportunity to investigate the mixing of dust and urban pollution and toestimate the contribution of the latter. The specific extinctioncross-section for dust at 500 nm was found to be equal to σ500*=0.64±0.04 m2 g, typical for medium to largedistances from dust sources, with weak wavelength dependence in the visibleand near infrared band (0.4–0.9 μm). The model showed a tendency tounderpredict AOD levels for increasing values of the Ångströmexponent, indicative of fine particles of anthropogenic origin inside theboundary layer. On average we found an AOD under-prediction of 10–15% forÅngström exponents in the range of 0 to 1 and 30–40% in the rangeof 1 to 2. Additionally, modelled surface concentrations were evaluatedagainst surface PM10 measurements. Model values were lower thanmeasured surface concentrations by 30% which, in conjunction with largescatter, indicated that the effect of the boundary layer anthropogeniccontribution to columnar dust loadings is amplified near the ground

annales geophysicae

Dust specific extinction cross-sections over the Eastern Mediterranean using the BSC-DREAM model and sun photometer data: the case of urban environments