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In this paper, we report the first systematic comparison of 12-year modeleddust extinction profiles vs. Raman lidar measurements. We use the BSC-DREAM8bmodel, one of the most widely used dust regional models in theMediterranean, and Potenza EARLINET lidar profiles for Saharan dust cases,the largest one-site database of dust extinction profiles. A total of 310dust cases were compared for the May 2000–July 2012 period. The modelreconstructs the measured layers well: profiles are correlated within 5% ofsignificance for 60% of the cases and the dust layer center of mass asmeasured by lidar and modeled by BSC-DREAM8b differ on average 0.3 ± 1.0 km.Events with a dust optical depth lower than 0.1 account for 70% of uncorrelated profiles. Although there is good agreement in terms of profileshape and the order of magnitude of extinction values, the model overestimates theoccurrence of dust layer top above 10 km. Comparison with extinctionprofiles measured by the Raman lidar shows that BSC-DREAM8b typicallyunderestimates the dust extinction coefficient, in particular below 3 km.Lowest model–observation differences (below 17%) correspond to alidar ratio at 532 nm and Ångström exponent at 355/532 nm of60 ± 13 and 0.1 ± 0.6 sr, respectively. These are in agreement with valuestypically observed and modeled for pure desert dust. However, thehighest differences (higher than 85%) are typically related to greaterÅngström values (0.5 ± 0.6), denoting smaller particles. All theseaspects indicate that the level of agreement decreases with an increase in mixing/modification processes

EARLINET dust observations vs. BSC-DREAM8b modeled profiles: 12-year-long systematic comparison at Potenza, Italy