Accession Number:

AD0657750

Title:

ICE MULTIPLICATION IN THE ATMOSPHERE,

Descriptive Note:

Corporate Author:

RAND CORP SANTA MONICA CALIF

Personal Author(s):

Report Date:

1967-08-01

Pagination or Media Count:

25.0

Abstract:

Data on the composition of unpolluted, unseeded stratocumulus and nimbostratus clouds having temperatures warmer than -9C reveal, in some instances, high concentrations of ice particles to approximately 400 per liter of cloud. On the basis of measurements of the concentration of ice-forming nuclei reported in the literature, and the activation temperature of particles believed to be natural atmospheric ice nuclei, it is concluded that some multiplication process was responsible for the observed concentrations of ice particles. Since moderately large drops were present in the glaciating clouds, the data are consistent with a process whereby drops are frozen and splintered however, in view of other evidence casting doubt on the validity of this process in the free atmosphere, alternative hypotheses are examined. Freezing of drops by a stochastic process is untenable, but a mechanical fracturing process seems possible and merits additional study. Author

Subject Categories:

  • Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE