Mie Scattering Applied to:

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Mie Scattering Applied to

• Optical particle counter response functions
• University of Wyoming measurements using optical
  particle counters

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Wyoming Optical Particle Counter, r gt 0.2 - 10.0
?m
Aerosol in
Optical Chamber
?Processor
White light
PHA
PMTs
Pump
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Sources of Error
Size Chromatic nature of light source Aerosol
index of refraction and shape Uniformity of
illumination PMT response pulse width broadening
Number concentration Flow rate Coincidence Poisson
counting uncertainty
Deshler, T., M. E. Hervig, D. J. Hofmann, J. M.
Rosen, and J. B. Liley, Thirty years of in situ
stratospheric aerosol size distribution
measurements from Laramie, Wyoming (41?N), using
balloon-borne instruments, J. Geophys. Res.,
108(D5), 4167, doi10.1029/2002JD002514, 2003
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Deshler, T., Observations for Chemistry (In
Situ) Particles, article for Encyclopedia of
Atmospheric Science, Academic Press, 2002.
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Low Gain
Mid Gain
High Gain
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Deshler, T. B. Nardi, A. Adriani, F. Cairo, G.
Hansen, F. Fierli, A. Hauchercorne, and L.
Pulvirenti, Determining the index of refraction
of polar stratospheric clouds above Andoya (69N)
by combining size-resolved concentration and
optical scattering measurements, J. Geophys.
Res., 105, 3943-3953, 2000.
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Deshler, T., R. Anderson-Sprecher, J. Barnes, B.
Clemesha, S. Godin-Beekmann, R. G. Grainger, D.
J. Hofmann, H. Jäger, S. Marsh, M. Osborn, and
D. Simonich, Non-volcanic stratospheric aerosol
trends 1971 - 2004, Chapter 5 of the SPARC
Assessment of Stratospheric Aerosol Properties
(L. W. Thomason and Th. Peter editors), WCRP-124,
WMO/TD-No. 1295, SPARC Report No. 4, February
2006.
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Eidhammer, T., D. C. Montague, and T. Deshler,
Determination of Index of Refraction and Size of
Supermicrometer Particles from Light Scattering
Measurements at Two Angles, J. Geophys. Res., in
press, May 2007.