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The chemical composition of 39 cloud samples and droplet sizedistributions in 24 cloud events were investigated at the summit of Mt. Taifrom July to October 2014. Inorganic ions, organic acids, metals, HCHO,H2O2, sulfur(IV), organic carbon, and elemental carbon as well as pH andelectrical conductivity were analyzed. The acidity of the cloud watersignificantly decreased from a reported value of pH 3.86 during 2007–2008 (Guoet al., 2012) to pH 5.87 in the present study. The concentrations of nitrateand ammonium were both increased since 2007–2008, but the overcompensation ofammonium led to an increase in the mean pH value. The microphysicalproperties showed that cloud droplets were smaller than 26.0 µm andmost were in the range of 6.0–9.0 µm at Mt. Tai. The maximum dropletnumber concentration (Nd) was associated with a dropletsize of 7.0 µm. High liquid water content (LWC) values could facilitate the formation of larger cloud dropletsand broadened the droplet size distribution. Cloud droplets exhibited a stronginteraction with atmospheric aerosols. Higher PM2. 5 levels resulted inhigher concentrations of water-soluble ions and smaller sizes with increased numbers of cloud droplets. The lower pH values were likely to occur at higherPM2. 5 concentrations. Clouds were an important sink for soluble materialsin the atmosphere. The dilution effect of cloud water should be consideredwhen estimating concentrations of soluble components in the cloud phase

Chemical composition and droplet size distribution of cloud at the summit of Mount Tai, China