Asian Journal of Atmospheric Environment

Korean Society for Atmospheric Environment (한국대기환경학회)
권호 표지
DOI QR코드

DOI QR Code

Laboratory-scale Experiment and Model Calculation on the Washout Mechanism of Asian Dust Particles

  • Ma, Chang-Jin (Department of Environmental Science, Fukuoka Women's University) ;
  • Kim, Ki-Hyun (Department of Environment & Energy, Sejong University)
  • Received : 2013.07.27
  • Accepted : 2013.08.29
  • Published : 2013.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, an investigation was conducted to assess the washout mechanism of Asian dust particles through both laboratory-scale experiment and model calculation. To artificially simulate Asian dust particle, $CaCO_3$ particles were generated inside an experimental chamber. They were then scavenged by the artificial rain drops. The abundant $CaCO_3$ particles scavenged on a rain drop were successively identified by SEM observation. The concentrations of Ca in residual $CaCO_3$ particles on individual droplet were quantified by PIXE analysis. There was a tendency toward a high accumulation of Ca on a relatively small drop (e.g., <1.0 mm diameter). It is thus suggested that smaller rain drops can effectively scavenge a significant amount of Asian dust particles in ambient atmosphere. The numerical estimation can account for 92.1% and 83.2% of Ca that were measured in small (<1.0 mm diameter) and large (>2.0 mm diameter) size drops, respectively.

Keywords

References

  1. Croft, B., Lohmann, U., Martin, R.V., Stier, P., Wurzler, S., Feichter, J., Hoose, C., Heikkilä, U., Van Donkelaar, A., Ferrachat, S. (2010) Influences of in-cloud aerosol scavenging parameterizations on aerosol concentrations and wet deposition in ECHAM5-HAM. Atmospheric Chemistry and Physics 10, 1511-1543. https://doi.org/10.5194/acp-10-1511-2010
  2. Kawamura, C., Hara, H. (2006) Influence of Kosa on precipitation chemistry in Japan. Journal of Japan Society for Atmospheric Environment 41, 335-346 (in Japanese).
  3. Kim, J.Y., Jung, C.H., Choi, B.C., Oh, S.N., Brechtel, F.J., Yoon, S.C., Kin, S.W. (2007) Number size distribution of atmospheric aerosols during ACE-Asia dust and precipitation events. Atmospheric Environment 41, 4841-4855. https://doi.org/10.1016/j.atmosenv.2007.02.024
  4. Ma, C.J. (2006) Chemical composition of a yellowish rainfall by the application of PIXE and micro-PIXE technique. Nuclear Instruments and Methods in Physics Research B 251, 501-506. https://doi.org/10.1016/j.nimb.2006.07.025
  5. Ma, C.J., Choi, K.C. (2007) A combination of bulk and single particle analyses for Asian dust study. Water Air, and Soil Pollution 183, 3-13. https://doi.org/10.1007/s11270-006-9302-z
  6. Ma, C.J., Kasahara, M., Tohno, S., Kamiya, T. (2001) A new approach for characterization of single raindrops. Water, Air, and Soil Pollution 130, 1601-1606. https://doi.org/10.1023/A:1013951511287
  7. Ma, C.J., Tohno, S., Kasahara, M., Hayakawa, S. (2005) A case study of the size-resolved individual particles collected at ground-based site on west coast of Japan during Asian dust storm event. Atmospheric Environment 39, 739-747. https://doi.org/10.1016/j.atmosenv.2004.09.073
  8. Pruppacher, H.R., Klett, J.D. (1997) Microphysics of clouds and precipitation. Kluwer Academic Publishers, Boston, London, 38-57.
  9. Sera, K., Futatsugawa, S., Matsuda, K. (1999) Quantitative analysis of untreated bio-samples. Nuclear Instruments and Methods in Physics Research B 150, 226-233. https://doi.org/10.1016/S0168-583X(98)01071-4
  10. Slinn, W.G.N., Hales, J.M. (1971) A revaluation of the role of thermophoresis as a mechanism in and below cloud scavenging. Journal of Atmospheric Science 28, 1465-1471. https://doi.org/10.1175/1520-0469(1971)028<1465:AROTRO>2.0.CO;2
  11. Strauss, W. (1975) Industrial gas cleaning. Pergamon Press, New York, 293-3005.
  12. Tenberken, B., Bachmann, K. (1996) Analysis of individual raindrops by capillary zone electrophoresis. Journal of Chromatograph A 755, 121-126. https://doi.org/10.1016/S0021-9673(96)00572-9
  13. Wang, P.K., Pruppacher, H.R. (1977) An experimental determination of the efficiency with aerosol particles collected by water drops in subsaturated air. Journal of Atmospheric Science 34, 1664-1678. https://doi.org/10.1175/1520-0469(1977)034<1664:AEDOTE>2.0.CO;2