Alexei Korolev
Cloud Physics and Severe Weather Research Division
Results of in-situ measurements of microphysics of cold clouds will be
presented here. The data were collected from the NRC Convair-580 during
seven field campaigns between 1994 and 2004.
The presentation will be focused on following issues:
1.Ice particle habits from in-situ measurements. Occurrence of
different habits versus temperature. Occurrence of pristine ice forms
(hexagonal columns and plates). Aspect ratio and roundness of ice
particles.
2. Microphysics of mixed phase and ice clouds. Ice water fraction
(IWC/TWC) at different temperatures, ice and droplet concentrations,
LWC, IWC, TWC, ice particle sizes vs. temperature. Occurrences of ice,
liquid and mixed phase clouds. Problem of existing of sustained mixed
clouds.
3. Relative humidity in ice, mixed and liquid clouds: theoretical
consideration and in-situ measurements. Generalization of Squires
equation for mixed phase clouds and its solution for quasi-steady
conditions. Time of phase relaxation in ice, mixed and liquid clouds.
Observation of the relative humidity in clouds with different phase
composition and comparison with the theory.