Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 2 2009 10.5194/acpd-9-10303-2009 http://www.atmos-chem-phys-discuss.net/9/10303/2009/ http://www.atmos-chem-phys-discuss.net/9/10303/2009/acpd-9-10303-2009.html http://www.atmos-chem-phys-discuss.net/9/10303/2009/acpd-9-10303-2009.pdf 10303 10336 2009-04-27 Cloud condensation nuclei measurements in the eastern Mediterranean marine boundary layer: CCN closure and droplet growth kinetics A. Bougiatioti C. Fountoukis N. Kalivitis S. N. Pandis A. Nenes N. Mihalopoulos mihalo@chemistry.uoc.gr Environmental Chemical Processes Laboratory, Department of Chemistry, University of Crete, Voutes, 71003, Heraklion, Greece Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA Institute of Chemical Engineering and High Temperature Chemical Processes (ICE-HT), Foundation for Research and Technology Hellas (FORTH), Patras, 26504, Greece Department of Chemical Engineering, Carnegie Mellon Univ., Pittsburgh, PA 15213, USA Measurements of cloud condensation nuclei (CCN) concentrations (cm^&minus;3) between 0.2 and 1.0% supersaturation, aerosol size distribution and chemical composition were performed at a remote marine site in the eastern Mediterranean, from September to October 2007 during the FAME-07 campaign. Virtually all the particles activate at 0.8% supersaturation, consistent with the very aged nature of the aerosol sampled. Application of Köhler theory, using measurements of bulk composition and size distribution, and assuming that organics are insoluble resulted in agreement between predicted and measured CCN concentrations within 3.4&plusmn;11% for all supersaturations, with a tendency for CCN underprediction (15&plusmn;8%; <i>r</i>²=0.92) at lower supersaturations (0.2-0.4%). Including the effects of the water-soluble organic fraction (which represents around 70% of the total organic content) reduces the underprediction bias at low supersaturations, but introduces a slight overprediction (around 5&plusmn;15%) bias at higher supersaturations (0.6–0.8%), likely from size-dependent variations of the sulfate to organic ratio. 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