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The function and response of an improved stratospheric condensation nucleus counterAn improved condensation nucleus counter (CNC) for use in the stratosphere is described. The University of Minnesota CNC (UMCNC) has a sequential saturator and condenser and uses n-butyl alcohol as the working fluid. The use of a coaxial saturator flow, with aerosol in the center and filtered, alcohol-laden air around it, speeds the response of this instrument and improves its stability as pressure changes. The counting efficiency has been studied as a function of particle size and pressure. The UMCNC provides an accurate measure of submicron aerosol concentration as long as the number distribution is not dominated by sub-0.02 micron diameter aerosol. The response of the UMCNC is compared with that of other stratospheric condensation nucleus counters, and the results of a (near) comparison with a balloon-borne condensation nucleus counter are presented. The UMCNC has operated 14 times on a NASA U-2 aircraft at altitudes from 8 to 21.5 km.
Document ID
Document Type
Reprint (Version printed in journal)
Wilson, J. C.
(Minnesota Univ. Minneapolis, MN, United States)
Hyun, J. H.
(Minnesota Univ. Minneapolis, MN, United States)
Blackshear, E. D.
(Minnesota, University Minneapolis, MN, United States)
Date Acquired
August 11, 2013
Publication Date
August 20, 1983
Publication Information
Publication: Journal of Geophysical Research
Volume: 88
ISSN: 0148-0227
Subject Category
Instrumentation And Photography
Accession Number
Distribution Limits

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