摘要
基于3维冰雹云模式,采用局地分析预报系统高时空分辨率分析场作为初始场,对鄂西北地区2009年4月15日发生的一次降雹天气过程进行数值模拟,分析了强对流发展过程的流场、雷达回波、水成物粒子演变特征以及催化机制.研究表明：基于高时空分辨率资料的3维冰雹云模式,能够较好地模拟冰雹云的形成发展演变及人工催化后微物理过程响应.模式输出的雷达回波强度及回波顶高与雷达实测资料相近,最大反射率因子分别为70 dBz、65 dBz,强回波中心基本上位于6～7 km处.冰雹云发展过程中呈现典型的低层辐合、高层辐散特征,消亡过程流场相反;冰雹胚胎形成主要源于冻滴自动转化,碰并云水和雨水促进冰雹增长;不同时间、不同剂量的催化对于防雹效果差异显著,催化时间越早,催化剂量越大,效果越好.
Based on three-dimensional hailstorm numerical model, LAPS （ local Analysis and Predic- tion System）analytic field with high space-time resolution was used as the initial field to simulate a hail- storm occurred in the northwest of Hubei province on Apr 15, 2009 and to analyze the distribution and e- volution of the strong convection process like wind field structure, radar echo, hydrometeors and seeding effects. The simulated results show that the output of LAPS for modeling initial field can provide higher temporal and spatial resolution data, which simulate the evolution of hail cloud and seeding effect well, The reflectivity and echo top from output of the model are close to observed ones, of which the maximum reflectivities are 70 dBz, 65 dBz respectively, the strong echo centers locate at 6-7 kin.The formation and development processes of the natural cloud show typical characteristics of lower-level convergence and up- per-level divergence, but the dissipation process is contrary; hailstorm embryo stems from automatic con- version of frozen drops and coalescing with cloud water and rainwater ; different seeding times and doses of agent may lead to different hail suppression effects; the earlier seeding time is, the greater the seeding dose. the better the results are.
出处
《气象科学》
CSCD
北大核心
2014年第1期104-111,共8页
Journal of the Meteorological Sciences
基金
国家自然科学基金(41105073)
湖北省局科技发展基金(2012Y03)
关键词
冰雹
冰雹云模式
数值催化模拟
Hail
Hailstorm model
Numerical seeding simulation
