Aerosol and vertical-velocity profiling and cloud glaciation observations during COPS

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After carrying out multiwavelength aerosol lidar and Doppler lidar measurements during three months of COPS, we begin the data analysis with the optical and microphysical characterization of the aerosols observed in the boundary layer and the free troposphere. Focus of our work is the retrieval of microphysical properties (e.g., particle number concentration, volume concentration) from six–wavelength aerosol lidar observations, and the analysis of vertical–velocity fields in the upper convective boundary layer (in updrafts and downdrafts, diurnal cycle, case studies) from Doppler lidar observations. These products are of outmost interest for modelling groups. A statistical analysis of the vertical–velocity data in the boundary layer and in the free troposphere (in aerosol layers, altocumulus and mixed–phase clouds, cirrus) will be performed, too. We will further focus on the poorly understood process of heterogeneous ice formation (cloud glaciation) in mid tropospheric altocumulus (embedded in the Saharan dust or forest fire smoke layers that we detected during COPS). We will analyze these cases with respect to the occurrence of ice layers as a function of cloud top temperature and aerosol type (smoke or dust).