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Vaughan Phillips

Research in the Area of Clouds, Aerosols and Climate

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A new parameterization of cloud droplet activation applicable to general circulation models

Author

  • Y Ming
  • V Ramaswamy
  • LJ Donner
  • Vaughan Phillips

Summary, in English

A new parameterization is proposed to link the droplet number concentration to the size distribution and chemical composition of aerosol and updraft velocity. Except for an empirical assumption of droplet growth, the parameterization is formulated almost entirely on first principles to allow for satisfactory performance under a variety of conditions. For a series of updraft velocity ranging from 0.03 to 10.0 m s(-1), the droplet number concentrations predicted with the parameterization are in good agreement with the detailed parcel model simulations with an average error of -4 +/- 26% (one standard deviation). The accuracy is comparable to or better than some existing parameterizations. The parameterization is able to account for the effects of droplet surface tension and mass accommodation coefficient on activation without adjusting the empirical parameter. These desirable attributes make the parameterization suitable for being used in the prognostic determination of the cloud droplet number concentration in general circulation models (GCMs).

Publishing year

2006

Language

English

Pages

1348-1356

Publication/Series

Journal of Atmospheric Sciences

Volume

63

Issue

4

Document type

Journal article

Publisher

Amer Meteorological Soc

Topic

  • Physical Geography

Status

Published

ISBN/ISSN/Other

  • ISSN: 1520-0469