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Growth rates of water droplets were measured with a static diffusion cloudcondensation chamber in May–June 2007 at a rural field site in SouthernOntario, Canada, 70 km north of Toronto. The observations include periodswhen the winds were from the south and the site was impacted byanthropogenic air from the U.S. and Southern Ontario as well as during a5-day period of northerly wind flow when the aerosol was dominated bybiogenic sources. The growth of droplets on anthropogenic size-selectedparticles centred at 0.1 μm diameter and composed of approximately40% organic and 60% ammonium sulphate (AS) by mass, was delayed by onthe order of 1 s compared to a pure AS aerosol. Simulations of thegrowth rate on monodisperse particles indicate that a lowering of the watermass accommodation coefficient from αc=1 to an average of αc=0.04 isneeded (assuming an insoluble organic with hygroscopicity parameter,κorg, of zero). Simulations of the initial growth rate on polydisperseanthropogenic particles agree best with observations for αc=0.07. Incontrast, the growth rate of droplets on size-selected aerosol of biogenic character,consisting of >80% organic, was similar to that of pure AS. Simulationsof the predominantly biogenic polydisperse aerosol show agreement betweenthe observations and simulations when κorg=0.2 (with upper and lowerlimits of 0.5 and 0.07, respectively) and αc=1. Inhibition of wateruptake by the anthropogenic organic applied to an adiabatic cloud parcelmodel in the form of a constant low αc increases the number of dropletsin a cloud compared to pure AS. If the αc is assumed to increase withincreasing liquid water on the droplets, then the number of dropletsdecreases which could diminish the indirect climate forcing effect. Theslightly lower κorg in the biogenic case decreases the number ofdroplets in a cloud compared to pure AS

Slower CCN growth kinetics of anthropogenic aerosol compared to biogenic aerosol observed at a rural site