Geofisica pura e applicata

, Volume 49, Issue 1, pp 217–224 | Cite as

Condensation nuclei and meteorological factors at Giza, Egypt

  • A. F. El Nadi
  • S. W. Banoub


Measurements of the concentration of condensation nuclei, carried out, daily, every two hours with aNolan-Pollak photoelectric nucleus counter in the period 1957–1960, are analysed for the relation between the concentration and the meteorological elements. It was found that the concentration of condensation nuclei changes according to the following behaviour:
  1. 1)

    The concentration increases to a maximum at:a) relative humidity in the range 50–59%,b) temperature in the range 25.0–29.0°C,c) vapour pressure in the range 12.0–12.6 mm Hg.

  2. 2)

    The concentration increases with direct sun light and decreases with diffused light.

  3. 3)

    The concentration is low during calm weather, high wind speeds and wind directions S-SSW.

  4. 4)

    The concentration varies slightly with the form and amount of clouds present in the sky except the case in which all the sky is hidden.



Relative Humidity Wind Speed Vapour Pressure Egypt Wind Direction 
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  1. (1).
    Aitken J. (1912):The sun as a fog producer, Proc. Roy. Soc. Edimb. 32, p. 183.Google Scholar
  2. (2).
    Atkinson J. R. (1955),Unchanged condensation nuclei produced by ultra-violet light, Geofisica pura e appl., 31, p. 54–9.CrossRefGoogle Scholar
  3. (3).
    Boylan R. K. (1926),Atmospheric dust and condensation nuclei, Proc. Roy. Irish Acad., A, 37, p. 58–70.Google Scholar
  4. (4).
    Dessens H. (1949):The use of spiders' threads in the study of condensation nuclei, Quart. J. Roy. Met. Soc., 75, p. 23.Google Scholar
  5. (5).
    Junge C. (1950),Das Wachstum der Kondensationskerne mit der relativen Feuchtigkeit, Ann. Met., 3, p. 126.Google Scholar
  6. (6).
    Junge C. (1952a),Gesetzmässigkeiten in der Grössenverteilung atmosphärischer Aerosol über dem Kontinent, Ber. Dtsch. Wetterdienst, U.S. Zone, 35, p. 261.Google Scholar
  7. (7).
    Junge C. (1952b),Remarks on formation of ice nuclei in the frost super-saturated region, Arch. Meteorol. Geophys. Bioklimatol, A, 5, p. 44–55.Google Scholar
  8. (8).
    Landsberg H. (1934),Condensation nuclei in the atmosphere, Monthly Weather Rev., 62, p. 442–5. (in German).CrossRefGoogle Scholar
  9. (9).
    Landsberg H. (1938)Atmospheric condensation nuclei, Gerlands Beitr. z. Geophys., Supplement Band 3, p. 155–252.Google Scholar
  10. (10).
    Nakaya U., Sugaya J. &Shoda M. (1957),Report of the Mauna Loa expedition in the winter of 1956–57, J. Fac. Sc. Hokkaido Univ. Ser. II (Physics), p. 1–34.Google Scholar
  11. (11).
    Nolan P. J. &Pollak L. W. (1946),The calibration of a Photo-Electric Nucleus Counter, Proc. Roy. Irish Acad. Dublin, A, 51, No. 2, p. 9–31.Google Scholar
  12. (12).
    Orr C., Hurd Jr. F. K. &Korbott W. J. (1958),Aerosols size and relative Humidity, J. of Coll. Sc., 13, p. 472–82.CrossRefGoogle Scholar
  13. (13).
    Scrase F. J. (1935),The sampling errors of Aitken Nucleus Counter, Quart. Jour. Roy. Met. Soc. London, 61, p. 367–79.Google Scholar
  14. (14).
    Verzár F. &Evans H. D. (1959),Production of atmospheric condensation nuclei by sun-rays, Geofis. pura e appl., 43, p. 259–69.CrossRefGoogle Scholar
  15. (15).
    Williams S. M. &Morgan W. A. (1955),The relation between the concentration of atmospheric condensation nuclei and other meteorological elements at Valentia Observatory, Geofis. pura e appl., 31, 129–46.CrossRefGoogle Scholar
  16. (16).
    Wright H. L. (1932),Observation of smoke particles and condensation nuclei at Kew Observatory, Geophys. Mem. (Met. Off. London), 6, No. 57, p. 22.Google Scholar

Copyright information

© Istituto Geofisico Italiano 1961

Authors and Affiliations

  • A. F. El Nadi
    • 1
  • S. W. Banoub
    • 2
  1. 1.Assiout UniversityAssioutEgypt
  2. 2.Faculty of EngineeringEin Shams UniversityCairoEgypt

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