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. A new In-Cloud Aerosol Scavenging Experiment (In-CASE) has been conceived tomeasure the collection efficiency (CE) of submicron aerosol particles bycloud droplets. In this setup, droplets fall at their terminal velocitythrough a 1 m high chamber in a laminar flow containing aerosolparticles. At the bottom of the In-CASE chamber, the droplet train isseparated from the aerosol particle flow – droplets are collected in animpaction cup, whereas aerosol particles are deposited on a high-efficiencyparticulate air (HEPA) filter. The collected droplets and the filter arethen analysed by fluorescence spectrometry since the aerosol particles areatomised from a sodium fluorescein salt solution(C20H10Na2O5). In-CASE fully controls all the parameterswhich affect the CE – the droplets and aerosol particles size distributionsare monodispersed, the electric charges of droplets and aerosol particlesare controlled, and the relative humidity is indirectly set via thechamber's temperature. This novel In-CASE setup is presented here as well asthe first measurements obtained to study the impact of relative humidity onCE. For this purpose, droplets and particles are electrically neutralised. Adroplet radius of 49.6±1.3 µm has been considered for sixparticle dry radii between 50 and 250 nm and three relative humidity levelsof 71.1±1.3 %, 82.4±1.4 % and 93.5±0.9 %. These newCE measurements have been compared to theoretical models from literaturewhich adequately describe the relative humidity influence on the measuredCE.

Laboratory study of the collection efficiency of submicron aerosol particles by cloud droplets – Part I: Influence of relative humidity