Journal article

Observational study of influence of aerosol hygroscopic growth on scattering coefficient over rural area near Beijing mega-city

Pan X, Yan P, Tang J, Ma J, Wang Z, Gbaguidi A, Sun Y ...see all

Atmospheric Chemistry and Physics, vol. 9, issue 19 (2009) pp. 7519-7530

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We investigated aerosol hygroscopic growth property and its influence on
scattering coefficient using M9003 nephelometers in coupling with
humidity controlled inlet system at a rural site near Beijing mega-city
from 24 April to 15 May 2006. Inlet relative humidity was controlled in
an increasing range of 40%-90% while aerosol hygroscopic growth factor
of scattering coefficient, f (RH=80%) as ratio of scattering
coefficient at RH=80% to ``dry{''} scattering coefficient (RHvaried in a range of 1.07-2.35 during the measurement. Further analysis
indicated that under dust episode, measured f (RH=80%) is 1.2 +/- 0.02,
and estimated periodic mean value of f (RH=80%) was 1.31 +/- 0.03 under
clean periods; during urban pollution periods, the aerosol displayed
relative strong water absorbing properties with f (RH=80%) of about
1.57 +/- 0.02. An examination of chemical composition of daily filter
samples highlighted that aerosol hygroscopicity was generally depressed
with the increasing ratio of organic matter (OMC)/ammonium sulfate (AS)
in particle mass, similar with the results of many previous studies.
However, a special case with high value of f (RH=80%)=2.21 and high
OMC/AS ratio was also observed, this exception reflected
physico-chemical particularities of organic matter and its complex
interaction with other compounds during this episode.

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  • X. L. Pan

  • P. Yan

  • J. Tang

  • J. Z. Ma

  • Z. F. Wang

  • a. Gbaguidi

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