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Optical and geometrical characteristics of cirrus clouds over Thessaloniki,Greece (40.6° N, 22.9° E) have been determined from the analysisof lidar and radiosonde measurements performed during the period from 2000to 2006. Cirrus clouds are generally observed in a mid-altitude regionranging from 8.6 to 13 km, with mid-cloud temperatures in the range from−65° to −38°C. The cloud thickness generally ranges from 1 to 5km and 38{%} of the cases studied have thickness between 2 and 3 km. Theretrieval of optical depth and lidar ratio of cirrus clouds is performedusing three different methods, taking into account multiple scatteringeffect. The mean optical depth is found to be 0.31±0.24 and thecorresponding mean lidar ratio is 30±17 sr following the scheme ofKlett-Fernald method. Sub-visual, thin and opaque cirrus clouds are observedat 3%, 57% and 40% of the measured cases, respectively. Acomparison of the results obtained between the three methods shows goodagreement. The multiple scattering errors of the measured effectiveextinction coefficients range from 20 to 60%, depending on cloud opticaldepth. The temperature and thickness dependencies on optical properties havealso been studied in detail. A maximum mid-cloud depth of ~3.5 km isfound at temperatures around ~−47.5°C, while there is anindication that optical depth and mean extinction coefficient increases withincreasing mid-cloud temperature. A correlation between optical depth andthickness was also found. However, no clear dependence of the lidar ratiovalues on the cloud temperature and thickness was found

Optical and geometrical characteristics of cirrus clouds over a Southern European lidar station