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Experimental characterization of the COndensation PArticle counting System for high altitude aircraft-borne application [Discussion paper]

  • his 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. An instrumental inter-comparison (cross-correlation) has been performed for several measurement flights and mission flights in the Arctic and the Tropics are discussed. Finally, COPAS measurements are used for an aircraft plume crossing analysis.

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Author:Ralf Weigel, Markus Hermann, Joachim CurtiusORCiD, Christiane Voigt, Saskia Walter, Thomas Böttger, Boris Lepukhov, Gennady Belyaev, Stephan BorrmannORCiDGND
URN:urn:nbn:de:hebis:30:3-292640
DOI:https://doi.org/10.5194/amtd-1-321-2008
ISSN:1867-8610
Parent Title (English):Atmospheric measurement techniques discussions
Publisher:European Geophysical Society
Place of publication:Katlenburg-Lindau
Document Type:Article
Language:English
Date of Publication (online):2008/11/28
Date of first Publication:2008/11/28
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2013/03/21
Volume:1
Page Number:27
First Page:321
Last Page:374
Note:
© Author(s) 2008. This work is distributed under the Creative Commons Attribution 3.0 License.
HeBIS-PPN:214745996
Institutes:Geowissenschaften / Geographie / Geowissenschaften
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 3.0