Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 10 3 2010 10.5194/acp-10-1329-2010 http://www.atmos-chem-phys.net/10/1329/2010/ http://www.atmos-chem-phys.net/10/1329/2010/acp-10-1329-2010.html http://www.atmos-chem-phys.net/10/1329/2010/acp-10-1329-2010.pdf 1329 1344 2010-02-05 Aerosol hygroscopicity at high (99 to 100%) relative humidities C. R. Ruehl crruehl@ucdavis.edu P. Y. Chuang A. Nenes Earth & Planetary Sciences, University of California, Santa Cruz, USA Earth & Atmospheric Sciences, Georgia Institute of Technology, Atlanta, USA The hygroscopicity of an aerosol strongly influences its effects on climate and, for smaller particles, atmospheric lifetime. While many aerosol hygroscopicity measurements have been made at lower relative humidities (RH) and under cloud formation conditions (RH>100%), relatively few have been made at high RH (99 to 100%), where the Kelvin (curvature) effect is comparable to the Raoult (solute) effect. We measured the size of droplets at high RH that had formed on particles composed of one of seven compounds with dry diameters between 0.1 and 0.5 μm. We report the hygroscopicity of these compounds using a parameterization of the Kelvin term, in addition to a standard parameterization (κ) of the Raoult term. For inorganic compounds, hygroscopicity could reliably be predicted using water activity data (measured in macroscopic solutions) and assuming a surface tension of pure water. In contrast, most organics exhibited a slight to mild increase in hygroscopicity with droplet diameter. This trend was strongest for sodium dodecyl sulfate (SDS), the most surface-active compound studied. The results suggest that, for single-component aerosols at high RH, partitioning of solute to the particle-air interface reduces particle hygroscopicity by reducing the bulk solute concentration. 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