Ice particles in maritime clouds near Tasmania

摘要: An instrumented aircraft was used to sample particles in the upper regions of small supercooled cumulus clouds maritime air off Tasmanian coast May 1968. 114 were studied on nine days, and it found average that had a 50 per cent chance containing ice when summit temperature about − 8°C reached. Not only cloud but also width profound effect whether found. The at which first reached detectable concentrations narrow particular day related nucleus concentration as measured chamber, being, general, highest days high concentration. However, some glaciated crystal order 100 1−1 found. These greater by factor ∼ 104 than estimated number active nuclei. The process multiplication crystals may be associated with riming particles. Riming assisted presence large droplets, up drizzle size, these clouds. Multiplication 10 took place 8 minutes. The various stages glaciation are described.