Atmospheric Measurement Techniques Discussions www.atmos-meas-tech-discuss.net 1867-8610 1 1 2008 10.5194/amtd-1-321-2008 http://www.atmos-meas-tech-discuss.net/1/321/2008/ http://www.atmos-meas-tech-discuss.net/1/321/2008/amtd-1-321-2008.html http://www.atmos-meas-tech-discuss.net/1/321/2008/amtd-1-321-2008.pdf 321 374 2008-11-28 Experimental characterization of the COndensation PArticle counting System for high altitude aircraft-borne application R. Weigel r.weigel@opgc.univ-bpclermont.fr M. Hermann J. Curtius C. Voigt S. Walter T. Böttger B. Lepukhov G. Belyaev S. Borrmann Max Planck Institute for Chemistry, Particle Chemistry Department, Mainz, Germany Leibniz Institute for Tropospheric Research, Leipzig, Germany Institute for Atmospheric Physics, Johannes Gutenberg-University, Mainz, Germany Inst. for Atmosphere and Environment, Johann Wolfgang Goethe Univ., Frankfurt, Germany Deutsches Zentrum fuer Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany Myasishchev Design Bureau, Moscow, Russia now at: Lab. de Météorologie Physique, Univ. Blaise Pascal, Clermont-Ferrand, France This study aims at a detailed characterization of an ultra-fine aerosol particle counting system for operation on board the Russian high altitude research aircraft M-55 "Geophysica" (maximum ceiling of 21 km). The COndensation PArticle counting Systems (COPAS) consists of an aerosol inlet and two dual-channel continuous flow Condensation Particle Counters (CPCs). The aerosol inlet, adapted for COPAS measurements on board the M-55 "Geophysica", is described concerning aspiration, transmission, and transport losses. The counting efficiencies of the CPCs using the chlorofluorocarbon FC-43 as the working fluid are studied experimentally at two pressure conditions, 300 hPa and 70 hPa. Three COPAS channels are operated with different temperature differences between the saturator and the condenser block yielding smallest detectable particle sizes (dp50 – as 50% detection "cut off" diameters) of 6 nm, 11 nm, and 15 nm, respectively, at ambient pressure of 70 hPa. The fourth COPAS channel is operated with an aerosol heating line (250°C) for a determination of the non-volatile number of particles. The heating line is experimentally proven to volatilize pure H2SO4-H2O particles for a particle diameter (dp) range of 11 nm<dp<200 nm. Additionally this study includes investigation to exclude auto-nucleation of the working fluid inside the CPCs. 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