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Within the framework of the "Hill Cap Cloud Thuringia 2010" (HCCT-2010)international cloud experiment, the influence of cloud processing on theactivation properties of ambient aerosol particles was investigated.Particles were probed upwind and downwind of an orographic cap cloud onMt Schmücke, which is part of a large mountain ridge in Thuringia, Germany.The activation properties of the particles were investigated by means ofsize-segregated cloud condensation nuclei (CCN) measurements at 3 to 4different supersaturations. The observed CCN spectra together with the totalparticle spectra were used to calculate the hygroscopicity parameter κfor the upwind and downwind stations. The upwind and downwind criticaldiameters and κ values were then compared for defined cloud events(FCE) and non-cloud events (NCE). Cloud processing was found to increase thehygroscopicity of the aerosol particles significantly, with an averageincrease in κ of 50%. Mass spectrometry analysis and isotopicanalysis of the particles suggest that the observed increase in thehygroscopicity of the cloud-processed particles is due to an enrichment ofsulfate and possibly also nitrate in the particle phase

Influence of cloud processing on CCN activation behaviour in the Thuringian Forest, Germany during HCCT-2010