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During the international ASTAR experiment (Arctic Studyof Aerosols, Clouds and Radiation) carried out from Longyearbyen(Spitsbergen) from 10 May to 11 June 2004, the AWI (Alfred WegenerInstitute) Polar 2 aircraft was equipped with a unique combination of remoteand in situ instruments. The airborne AMALi lidar provided downwardbackscatter and Depolarisation ratio profiles at 532 nm wavelength. The insitu instrumental setup comprised a Polar Nephelometer, a Cloud ParticleImager (CPI) as well as a Nevzorov and standard PMS probes to measure cloudparticle properties in terms of scattering characteristics, particlemorphology and size, and in-cloud partitioning of ice/water content. Theobjective of the paper is to present the results of a case study related toobservations with ice crystals precipitating down to supercooledboundary-layer stratocumulus. The flight pattern was predefined in a waythat firstly the AMALi lidar probed the cloud tops to guide the in situmeasurements into a particular cloud formation. Three kinds of clouds withdifferent microphysical and optical properties have therefore beenquasi-simultaneously observed: (i) water droplets stratiform-layer, (ii)drizzle-drops fallstreak and (iii) precipitating ice-crystals from a cirruscloud above. The signatures of these clouds are clearly evidenced from thein situ measurements and from the lidar profiles in term of backscatter andDepolarisation ratio. Accordingly, typical lidar ratios, i.e.,extinction-to-backscatter ratios, are derived from the measured scatteringphase function combined with subsequent particle shapes and sizedistributions. The backscatter profiles can therefore be retrieved underfavourable conditions of low optical density. From these profiles extinctionvalues in different cloud types can be obtained and compared with the directin situ measurements

Microphysical and optical properties of precipitating drizzle and ice particles obtained from alternated lidar and in situ measurements