洪延超. 1999. 冰雹形成机制和催化防雹机制研究[J]. 气象学报, 57(1):30-44, doi:10.11676/qxxb1999.003
冰雹形成机制和催化防雹机制研究
STUDY ON MECHANISM OF HAIL FORMATION AND HAIL SUPPRESSION WITH SEEDING
投稿时间:1997-12-20  修订日期:1998-07-20
DOI:10.11676/qxxb1999.003
中文关键词:  雹云模拟  催化试验  机制研究
英文关键词:Simulation of hail cloud  Seedingex periment  Mechanism study
基金项目:国家“九五”攻关项目“农业气象灾害防御技术研究”07专题
作者单位
洪延超 中国科学院大气物理研究所, 北京, 100029 
摘要点击次数: 1905
全文下载次数: 2080
中文摘要:
      利用文献[1]发展的三维弹性冰雹云催化模式模拟研究了1997年7月8日陕西省旬邑防雹试验区出现的一块冰雹云,分析其冰雹形成的物理机制,对雹云做了高度催化试验,研究了催化防雹机制。结果表明,97%的雹块是以冻滴为核心增长的,在云中冰雹还未形成前,于强上升气流区的适当高度催化效果较好,而在上升气流极值高度,亦是高含水量区催化效果最好。催化使霰和冻滴的浓度增加,粒子质量减小,向雹的转化比例大为降低,因此雹块的质量和浓度都减小,达到了防雹的目的。
英文摘要:
      Using the 3-D hail cloud numerical model developed by author,a hail cloud occurred in Xunyi area,Shanxi province on July 8,1997 is simulated to analyze mechanismof hail formation and hail suppression with seeding.The results show that embryoes of 97% of hailare frozen drops.The seeding experiments with AgI for heig hts show that if the seeding is made before hail formation,the o ptimum seeding position is located in the maximumupdraft area and its center,i.e.,AgI is seeded in the zone with high water content to be coordinated with maximum zone of the updraft.The seeding make concentration of graupe land frozen drop increase and their average mass/size decrease, so that proportion of conversion from graupeland frozen drop into hail descend greatly and mass and concentration of hailstone are all decrease to achieve our purpose for hail suppression.
HTML   查看全文   查看/发表评论  下载PDF阅读器
分享按钮