A Laboratory Study of the Melt and Evaporation of Ice Precipitation

水物质的转化与分配 在自然云层中， 大气的热量收支和运动能力。 的 蒸汽液体和冰之间的转化 大约20%的热量收支在对流层中部（15，000- 2万英尺），而水和冰的分布 基本上定义了辐射的一个关键成分 领域 此外，云粒子的融化和蒸发 可能产生危险的向下运动，如下击暴流。 这项工作的目的是实验 冰颗粒的融化和蒸发试验 各种大气条件下模拟的动态 扩散室;颗粒破碎，清除和 将研究电气化。 结果将 与最近野外获得的同源测量值相比， 实验 约翰·哈雷特博士完全有资格从事这项工作; 他很容易被同行们公认为是最好的人之一。 云物理学家

The transformation and distribution of water substance in natural clouds play a crucial role in both the atmosphere's heat budget and its capacity for motion. The transformations between vapor liquid and ice account for about 20% of the heat budget in the mid-troposphere (15,000 - 20,000 feet), while the distribution of water and ice essentially defines a crucial ingredient of the radiation field. Further, melting and evaporation of cloud particles can produce hazardous downward motions such as downbursts. The objective of this work is the experimental examination of melting and evaporation of ice particles under various atmospheric conditions as simulated in a dynamical diffusion chamber; particle breakup, scavenging and electrification will be examined. The results will be compared with cognate measurements obtained in recent field experiments. Dr. John Hallett is well qualified to pursue this work; he is readily acknowledged by his peers to be one of the best cloud physicists.