Deformation of the Size Distribution of Aerosol Particles Dispersing from Land to Ocean

  • M. Misaki
  • M. Ikegami
  • I. Kanazawa


When the aerosols originated on land are dispersed over the ocean, they are not only decreased in the concentration, but deformed in the pattern of size distribution. This deformation was ascertained by the experiments aboard an observation ship in 1972 and 1974.

From the mobility spectrometry of atmospheric ions using the apparata we have developed, and the concurrent size spectrometry of large particles using a Royco Optical Counter, the whole size distribution of aerosol particles covering the radius range from 3 nm to 5 µn was determined over the cruising course of 1000 km from Tokyo.

With the aid of the result of 222Rn concentration measurements, the effect of dilution by the spatial dispersion was estimated. Subtracting the dilution factor from the apparent decay rate of the aerosol concentration, the residence time of aerosols was determined in relation to the particle size.

In both the expeditions in 1972 and 1974, the deformation of the size distribution was found to take place in such a way that the center of gravity of the distribution is shifted towards smaller size with the increasing age of aerosols.


Aerosol Particle Aerosol Concentration Spatial Dispersion Decay Time Constant 222Rn Concentration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Cobb, W. E., J. Atmosph. Sci. 30, 101 (1973).CrossRefGoogle Scholar
  2. 2.
    Greenfield, S. M., J. Met. 14, 115 (1957).CrossRefGoogle Scholar
  3. 3.
    Misaki, M. and T. Takeuti, J. Met. Soc. Japan 48, 263 (1970).Google Scholar
  4. 4.
    Misaki, M., M. Ohtagaki, and I. Kanazawa, PAGEOPH 100, 133 (1972).CrossRefGoogle Scholar
  5. 5.
    Morita, Y., Proceedings of the Res. Inst. of Atmospherics, Nagoya Univ. 20, A, 1 (1973).Google Scholar
  6. 6.
    Sagalyn, R. C., The production and removal of small ions and charged nuclei over the Atlantic Ocean. Recent Advances in Atmospheric Electricity, Edited by L. G. Smith, Pergamon Press 21 -41 (1958).Google Scholar

Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG., Darmstadt 1976

Authors and Affiliations

  • M. Misaki
    • 1
  • M. Ikegami
    • 1
  • I. Kanazawa
    • 1
  1. 1.Meteorological Res. Inst.Suginami, TokyoJapan

Personalised recommendations