Journal
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
Volume 129, Issue 587, Pages 39-65Publisher
WILEY
DOI: 10.1256/qj.01.204
Keywords
ice-particle concentration; ice-particle size; ice-water content
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A detailed study of mixed-phase clouds associated with frontal systems obtained from a large dataset collected by the Convair 580 aircraft of the National Research Council (NRC) of Canada is presented. The total length of analysed in-cloud legs having total-water content (TWC) > 0.01g m(-3) was about 44 x 10(3) km. The ice-water fraction (mu3 = ice-water content/TWC) had a minimum in the range 0.1 < mu3 < 0.9, and two maxima for liquid clouds (mu3 < 0. 1) and ice clouds (mu3 > 0.9). The concentration of particles in glaciated clouds was found to be nearly constant at 2-5 cm(-3) for temperatures -35 degreesC < T < 0 degreesC. The concentration of droplets in liquid clouds decreased with decreasing temperature. The mean volume diameter of particles in ice clouds varied between 20 mum and 35 mum, and in liquid clouds between 10 mum and 12 mum. Both ice- and liquid-water content decreased with decreasing temperature. The results of this study may be used for validation of remote-sensing retrievals, and for weather- and climate-models.
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