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. Knowledge of the particle lidar ratio (Sλ) and the particle lineardepolarisation ratio (δλ) for different aerosol types allowsfor aerosol typing and aerosol-type separation in lidar measurements.Reference values generally originate from dedicated lidar observations butmight also be obtained from the inversion of AErosol RObotic NETwork (AERONET) sun/sky radiometermeasurements. This study investigates the consistency of spectral Sλand δλ provided in the recently released AERONET version 3inversion product for observations of undiluted mineral dust in the vicinityof the following major deserts: Gobi, Sahara, Arabian, Great Basin, and Great Victoria. Pure dust conditions are identified by an Ångström exponent&lt;0.4 and a fine-mode fraction &lt;0.1. The values of spectral Sλ are found to vary for the different sourceregions but generally show an increase with decreasing wavelength. Thefeature correlates to AERONET, retrieving an increase in the imaginary part ofthe refractive index with decreasing wavelength. The smallest values ofSλ=35–45 sr are found for mineral dust from the Great Basindesert,while the highest values of 50–70 sr have been inferred from AERONETobservations of Saharan dust. Values of Sλ at 675, 870, and 1020 nmseem to be in reasonable agreement with available lidar observations, whilethose at 440 nm are up to 10 sr higher than the lidar reference. Thespectrum of δλ shows a maximum of 0.26–0.31 at 1020 nm anddecreasing values as wavelength decreases. AERONET-derived δλvalues at 870 and 1020 nm are in line with the lidar reference, while values of0.19–0.24 at 440 nm are smaller than the independent lidar observations bya difference of 0.03 to 0.08. This general behaviour is consistent withearlier studies based on AERONET version 2 products.

On the spectral depolarisation and lidar ratio of mineral dust provided in the AERONET version 3 inversion product