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Performance of a Focused Cavity Aerosol Spectrometer for Measurements in the Stratosphere of Particle Size in the 0.06–2.0-µm-Diameter Range

H.H. Jonsson* Department of Engineering, University of Denver, Denver, Colorado

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J.C. Wilson* Department of Engineering, University of Denver, Denver, Colorado

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C.A. Brock* Department of Engineering, University of Denver, Denver, Colorado

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R.G. KnollenbergParticle Measuring Systems, Inc., Boulder, Colorado

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T.R. NewtonParticle Measuring Systems, Inc., Boulder, Colorado

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J.E. DyeNational Center for Atmospheric Research, Boulder, Colorado

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D. BaumgardnerNational Center for Atmospheric Research, Boulder, Colorado

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S. BorrmannUniversity of Mainz, Mainz, Germany

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G.V. FerryNASA Ames Research Center, Moffett Field, California

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R. PueschelNASA Ames Research Center, Moffett Field, California

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Dave C. Woods** NASA Langley Research Center, Hampton, Virginia

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Mike C. PittsScience Applications International Corporation, Hampton, Virginia

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Abstract

A focused cavity aerosol spectrometer aboard a NASA ER-2 high-altitude aircraft provided high-resolution measurements of the size of the stratospheric particles in the 0.06–2.0-µm-diameter range in flights following the eruption of Mount Pinatubo in 1991. Effects of anisokinetic sampling and evaporation in the sampling system were accounted for by means adapted and specifically developed for this instrument. Calibrations with monodisperse aerosol particles provided the instrument's response matrix, which upon inversion during data reduction yielded the particle size distributions. The resultant dataset is internally consistent and generally shows agreement to within a factor of 2 with comparable measurements simultaneously obtained by a condensation nuclei counter, a forward-scattering spectrometer probe, and aerosol particle impactors, as well as with nearby extinction profiles obtained by satellite measurements and with lidar measurements of backscatter.

Abstract

A focused cavity aerosol spectrometer aboard a NASA ER-2 high-altitude aircraft provided high-resolution measurements of the size of the stratospheric particles in the 0.06–2.0-µm-diameter range in flights following the eruption of Mount Pinatubo in 1991. Effects of anisokinetic sampling and evaporation in the sampling system were accounted for by means adapted and specifically developed for this instrument. Calibrations with monodisperse aerosol particles provided the instrument's response matrix, which upon inversion during data reduction yielded the particle size distributions. The resultant dataset is internally consistent and generally shows agreement to within a factor of 2 with comparable measurements simultaneously obtained by a condensation nuclei counter, a forward-scattering spectrometer probe, and aerosol particle impactors, as well as with nearby extinction profiles obtained by satellite measurements and with lidar measurements of backscatter.

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