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Aerosols influence the Earth radiative budget through scattering andabsorption of solar radiation. Several methods are used to investigateaerosol properties and thus quantify their direct and indirect impacts onclimate. At the Puy de Dôme station, continuous high-altitude near-surface in situ measurements and low-altitude ground-based remote sensingatmospheric column measurements give the opportunity to compare the aerosolextinction measured with both methods over a 1-year period. To ourknowledge, it is the first time that such a comparison is realised withcontinuous measurements of a high-altitude site during a long-term period.This comparison addresses to which extent near-surface in situ measurements arerepresentative of the whole atmospheric column, the aerosol mixing layer (ML) or the free troposphere (FT). In particular, the impact of multi-aerosol layers events detected using lidar backscatter profiles is analysed.A good correlation between in situ aerosol extinction coefficient and aerosoloptical depth (AOD) measured by the Aerosol Robotic Network (AERONET) sunphotometer is observed with a correlation coefficient around 0.80,indicating that the in situ measurements station is representative of the overall atmospheric column. After filtering for multilayer cases and correcting for each layer optical contribution (ML and FT), the atmospheric structure seemsto be the main factor influencing the comparison between the two measurementtechniques. When the site lies in the ML, the in situ extinction represents 45 %of the sun photometer ML extinction while when the site lies within the FT,the in situ extinction is more than 2 times higher than the FT sun photometerextinction. Moreover, the assumption of a decreasing linear vertical aerosolprofile in the whole atmosphere has been tested, significantly improving theinstrumental agreement. Remote sensing retrievals of the aerosol particlesize distributions (PSDs) from the sun photometer observations are thencompared to the near-surface in situ measurements, at dry and at ambient relative humidities. When in situ measurements are considered at dry state, the in situ fine mode diameters are 44 % higher than the sun-photometer-retrieved diameters and in situ volume concentrations are 20 % lower than those of the sun-photometer-retrieved fine mode concentration. Using a parameterised hygroscopic growth factor applied to aerosol diameters, the difference between in situ and retrieved diameters grows larger. Coarse mode in situ diameters and concentrations show a good correlation with retrieved PSDs from remote sensing

Comparison of the aerosol optical properties and size distribution retrieved by sun photometer with in situ measurements at midlatitude