On leave from Institute of Geophysics, University of Warsaw, Poland.
Microphysical properties of stratocumulus clouds during ACE-2
Version of Record online: 28 FEB 2003
Volume 52, Issue 2, pages 868–887, April 2000
How to Cite
Pawlowska, H. and Brenguier, J.-L. (2000), Microphysical properties of stratocumulus clouds during ACE-2. Tellus B, 52: 868–887. doi: 10.1034/j.1600-0889.2000.00076.x
- Issue online: 28 FEB 2003
- Version of Record online: 28 FEB 2003
- Received 29 March 1999; in final form 1 October 1999
- Cited By
Microphysical measurements performed during 8 flights of the CLOUDYCOLUMN component of ACE-2, with the Meteo-France Merlin-IV, are analyzed in terms of droplet number concentration and size. The droplet concentration is dependent upon the aerosol properties within the boundary layer. Its mean value over a flight varies from 55 cm−3, for the cleanest conditions, to 244 cm−3, for the most polluted one. For each flight, the variability of the concentration, in selected cloud regions that are not affected by mixing with dry air or drizzle scavenging, ranges from 0.5 to 1.5 of the mean value. The mean volume diameter increases with altitude above cloud base according to the adiabatic cloud model. The frequency distribution of mean droplet volume normalized by the adiabatic value, for the selected regions, shows the same dispersion as the distribution of normalized concentration. The values of droplet concentration versus mean volume diameter are then examined in sub-adiabatic samples to characterize the effects of mixing and drizzle scavenging. Finally, the ratio of mean volume diameter to effective diameter is analyzed and a simple relationship between these 2 crucial parameters is proposed.