Geofisica pura e applicata

, Volume 43, Issue 1, pp 243–249

The nuclei of natural cloud formation part II: The supersaturation in natural clouds and the variation of cloud droplet concentration

  • S. Twomey

DOI: 10.1007/BF01993560

Cite this article as:
Twomey, S. Geofisica Pura e Applicata (1959) 43: 243. doi:10.1007/BF01993560


Calculations are performed to determine the time variation of supersaturation during cloud formation. It is shown that a simple expression can be used to obtain the maximum supersaturation (and hence the number of nuclei activated) as a function of updraught velocity and nucleus spectra insert omitted portion of copy reported in Part 1 and it isshown that they lead to cloud droplet concentrations which agree with those actually observed.

Copyright information

© Istituto Geofisico Italiano 1959

Authors and Affiliations

  • S. Twomey
    • 1
  1. 1.C.S.I.R.O., Division of RadiophysicsUniversity GroundsSydneyAustralia

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