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Raman lidar measurements performed in Potenza by the Raman lidar system BASILin the presence of cirrus clouds are discussed.Measurements were performed on 6 September 2004 in the frame of the Italian phaseof the EAQUATE Experiment. The major feature of BASIL is represented by its capability to perform high-resolutionand accurate measurements of atmospheric temperature and water vapour,and consequently relative humidity, both in daytime and night-time, based on theapplication of the rotational and vibrational Raman lidar techniques in the UV.BASIL is also capable to provide measurements of the particle backscatter and extinctioncoefficient, and consequently lidar ratio (at the time of these measurements, only at one wavelength),which are fundamental to infer geometrical and microphysical properties of clouds. A case study is discussed in order to assess the capability of Raman lidars to measurehumidity in presence of cirrus clouds, both below and inside the cloud.While air inside the cloud layers is observed to be always under-saturated with respect to water,both ice super-saturation and under-saturation conditions are found inside these clouds.Upper tropospheric moistening is observed below the lower cloud layer. The synergic use of the data derived from the ground based Raman Lidar and of spectral radiances measured by the NAST-I Airborne Spectrometer allows the determination of the temporalevolution of the atmospheric cooling/heating rates due to the presence of the cirrus cloud. Lidar measurements beneath the cirrus cloud layer have been interpreted usinga 1-D cirrus cloud model with explicit microphysics. The 1-D simulationsindicate that sedimentation-moistening has contributed significantly to themoist anomaly, but other mechanisms are also contributing. This resultsupports the hypothesis that the observed mid-tropospheric humidification isa real feature which is strongly influenced by the sublimation ofprecipitating ice crystals. Results illustrated in this study demonstratethat Raman lidars, like the one used in this study, can resolve the spatialand temporal scales required for the study of cirrus cloud microphysicalprocesses and appear sensitive enough to reveal and quantify uppertropospheric humidification associated with cirrus cloud sublimation

UV Raman lidar measurements of relative humidity for the characterization of cirrus cloud microphysical properties