The dimensions and aggregation of ice crystals in natural clouds
The dimensions and aggregation of ice crystals in natural clouds
复制标题
自然云中冰晶的尺寸和聚集
DOI：
10.1029/jc079i015p02199
复制
发表时间：
1974
影响因子：
--
通讯作者：
J. Locatelli
中科院分区：
文献类型：
--
作者：
P. Hobbs;Shi;J. Locatelli
在两个冬季期间，从云中和喀斯喀特山脉地面站收集的冰粒中，获得了针状和柱状晶体的长度和宽度以及六边形板的厚度和直径的测量值。这些尺寸之间的最佳拟合经验关系。还对这些颗粒进行了检查，以获得有关冰粒聚集体性质的详细信息。聚集体的最大尺寸和发生聚集体的概率随着温度的降低而降低，但都表现出局部最大值附近的枝晶生长区域。低于-15 °C且颗粒浓度小于0.1 cm−3时，不太可能形成聚集体;高于-5 °C且颗粒浓度超过1 cm−3时，形成聚集体的可能性超过50%。聚集体的尺寸谱主要取决于其组成晶体的尺寸。给出了各种尺寸聚集体中组分晶体的数量。
From ice particles collected in clouds and at ground stations in the Cascade Mountains during two winter seasons, measurements have been obtained of the lengths and widths of needles and columnar crystals and the thicknesses and diameters of hexagonal plates. Best-fit empirical relationships between these dimensions are presented. The particles have also been examined to obtain detailed information on the properties of aggregates of ice particles. The maximum dimensions of aggregates and the probability of the occurrence of aggregates decrease with decreasing temperature, but both exhibit a local maximum near the dendritic growth region. Below −15°C and for particle concentrations less than 0.1 cm−3, aggregates are unlikely to form; above −5°C and for particle concentrations in excess of 1 cm−3 there is more than a 50% chance of the formation of aggregates. The size spectra of aggregates depend mainly on the sizes of their component crystals. The number of component crystals in aggregates of various sizes is given.