经验性三维云模式中冰雹生长的数值试验研究

本文根据前人观测分析的右移风暴和高原强风暴的主要特征,提出了一个经验性三维云场模式,该模式比过去的给定模式进了一步。利用这个模式,对雹胚半径、引入的初始高度和云阶段在冰雹生长中的作用进行了数值试验。结果表明:其初始高度有很明显的影响;雹胚半径的选用要和云阶段密切匹配。这些对今后进行更多试验以确定人工防雹的最佳引粒条件有一定的参考价值。另外还研究了冰雹在这个云场中的经历和轨迹,其初步结果和观测事实比较吻合,并和文献1]的某些结论一致。文中还发展了一种拉格朗日三维内插法,这个方法对涉及到粒子在三维场中运行的各种大气物理问题的计算(如烟云粗粒子的输运等)具有一定的通用性。

A NUMERICAL EXPERIMENT ON THE HAIL GROWTH IN A GIVEN THREE-DIMENSIONAL CLOUD MODEL

Based on the characteristics of SR storms and plateau storms obtained by early studies, a given three-dimensional cloud model is presented. Several runs were made with various embryo radii, initial levels and initial times. The preliminary results show that hail growth is sensitive to the initial level and to the embryo size combined with time, which would be useful to study the optimum conditions for hailstorm seeding. Some trajectories of hailstones are also investigated. In addition, a three-dimensional interpolation formula developed from one-dimensional Lagrangian interpolation is pressented in this paper.