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Airborne lidar and in-situ measurements of the aerosol properties wereconducted between Svalbard Island and Scandinavia in April 2008. Evidence ofaerosol transport from Europe and Asia is given. The analysis of the aerosoloptical properties based on a multiwavelength lidar (355, 532, 1064 nm)including volume depolarization at 355 nm aims at distinguishing the role ofthe different aerosol sources (Siberian wild fires, Eastern Asia and Europeananthropogenic emissions). Combining, first aircraft measurements, secondFLEXPART simulations with a calculation of the PBL air fraction originatingfrom the three different mid-latitude source regions, and third level-2CALIPSO data products (i.e. backscatter coefficient 532 nm,volumedepolarization and color ratio between 1064 and 532 nm in aerosol layers)along the transport pathways, appears a valuable approach to identify therole of the different aerosol sources even after a transport time larger than4 days. Optical depth of the aerosol layers are always rather small (<4%)while transported over the Arctic and ratio of the total attenuatedbackscatter (i.e. including molecular contribution) provide more stableresult than conventional aerosol backscatter ratio. Above Asia, CALIPSO dataindicate more depolarization (up to 15%) and largest color ratio (>0.5)for the northeastern Asia emissions (i.e. an expected mixture of Asianpollution and dust), while low depolarization together with smaller and quasiconstant color ratio (≈0.3) are observed for the Siberian biomassburning emissions. A similar difference is visible between two layersobserved by the aircraft above Scandinavia. The analysis of the timeevolution of the aerosol optical properties revealed by CALIPSO between Asiaand Scandinavia shows a gradual decrease of the aerosol backscatter,depolarization ratio and color ratio which suggests the removal of thelargest particles in the accumulation mode. A similar study conducted for aEuropean plume has shown aerosol optical properties intermediate between thetwo Asian sources with color ratio never exceeding 0.4 and moderatedepolarization ratio being always less than 8%, i.e. less aerosol from theaccumulation mode

Airborne measurements of aerosol optical properties related to early spring transport of mid-latitude sources into the Arctic