Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 5 1 2005 10.5194/acpd-5-287-2005 http://www.atmos-chem-phys-discuss.net/5/287/2005/ http://www.atmos-chem-phys-discuss.net/5/287/2005/acpd-5-287-2005.html http://www.atmos-chem-phys-discuss.net/5/287/2005/acpd-5-287-2005.pdf 287 323 2005-01-25 Water activity and activation diameters from hygroscopicity data – Part I: Theory and application to inorganic salts S. M. Kreidenweis K. Koehler P. DeMott A. J. Prenni C. Carrico B. Ervens Department of Atmospheric Science, Colorado State University, Fort Collins, CO, 80523, USA Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO, 80523/NOAA, Boulder, CO, USA A method is described that uses particle hygroscopicity measurements, made with a humidified tandem differential mobility analyzer (HTDMA), to determine solution water activity as a function of composition. The use of derived water activity data in computations 5 determining the ability of aerosols to serve as cloud condensation nuclei (CCN) is explored. Results for sodium chloride and ammonium sulfate are shown in Part I. In Part II (Koehler et al., to be submitted, 2005), results are reported for several atmospherically-relevant dicarboxylic acids: malonic acid, glutaric acid and oxalic acid. The methodology yields solution water activities and critical dry diameters for 10 ammonium sulfate and sodium chloride in good agreement with previously published data. The approach avoids the assumptions required for application of simplified and modified K¨ohler equations to predict CCN activity, most importantly, knowledge of the molecular weight and the degree of dissociation of the soluble species. Predictions of the dependence of water activity on the mass fraction of aerosol species are sensitive 15 to the assumed dry density, but predicted critical dry diameters are not.