Multiwavelength micropulse lidar (MML) designed for continuous optical sounding of the atmosphere is presented. A
specific signal processing technique applying two directional Kalman filtering is introduced in order to enhance signal
to noise ratio. Application of this technique is illustrated with profiles collected in course of COAST 2009 and
WRNP 2010 research campaigns.
Results of measurements of atmospheric aerosol performed with multiwavelength lidar are presented. An approach to
retrieve profiles of aerosol particle size distribution was elaborated. It consists in direct fit of predefined distribution
(usually combination of lognormal functions with a few free parameters) to the experimental signals. The approach was
used for retrieving marine aerosol distributions. Studies of behavior of the particles at the cumulus cloud base were
performed as well. There the assumptions based on Twomey's model of the adiabatic parcel were used to support the
retrieving technique which was adopted to analyze lidar profiles (at 355, 532 and 1064 nm wavelengths) registered in the
region of the base of small warm cumulus clouds. Size distribution profiles and changes of particle effective radius
within the range of 0.5 - 3 μm were discussed.