Research on the Effects of Aerosol Water Content on Scatter ing Coefficient
Date Issued
2002-07-31
Date
2002-07-31
Author(s)
鄭福田
DOI
902211E002052
Abstract
Utilizing the facilities set up in the
previous year, changes of aerosol size
distribution and scattering coefficient are
measured in the relative
humidity-manipulated scenarios to resolve
the mechanism of aerosol water content
affecting scattering coefficient.
The poly-dispersed sodium chloride,
ammonium nitrate, and ammonium sulfate
particles were prepared as pure-salt test
particles. Internally mixed ammonium
nitrate and ammonium sulfate particles were
also used for test. The size distribution
change of test particles can be surveyed by
examining particle size change between 30%
RH and 90% RH. The results show that the
size change gets larger with larger initial
particle size. The particle size change
values are similar as those reported by other
studies. The scattering coefficients
corresponding to different RH do not follow
the same trend as particle size. The cause
should be the non-linearity behavior of
scattering efficiency with particle size.
The nephelometer readings are
systematically higher than the theoretical
estimation with a difference of 12% to 34%.
The modified theoretical solution considering
particles’ evaporation in nephelometer leads
to a less difference of 7% to 14%.
Subjects
Aerosol
Light scattering
Scattering coefficient
Water
content
content
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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