摘要
该文对CAMS原有的三维对流云模式 (2 0 0 0版 )进行了改进 ,引入雪晶的比水量和数浓度作为预报变量 ,加进与雪晶有关的 1 1种微物理过程 ,从而使模式的微物理过程更加完善 ,使其能更好的模拟对流云降水过程。通过对 1 996年北京雹云个例模拟 ,发现 :模式模拟云的多单体结构、回波顶高、强中心位置与雷达观测比较一致 ,并能很好的解释地面雹块结构的形成原因。对改进前后的模式计算结果进行对比分析发现 :改进前后动力场变化不大 ,主要是微物理过程产生的影响 。
The CAMS 3 D convective cloud model was improved by adding snow as a new kind of hydrometeor to describe the micro physics processes better, so to simulate the convective cloud precipitation processes. The simulation results of a hail cloud case in Beijing in 1996 show that the simulated multi cell structure, echo depth and strong echo center of the clouds are similar to the observation. It explains the cause of the structure of hailstones. The comparison between the results of the improved model and the primary model show that the difference is small in the dynamical fields, and the main reason leading to the enhanced precipitation is the effect of the microphysical processes. An AgI seeding experiment was also conducted with the improved model.
出处
《应用气象学报》
CSCD
北大核心
2003年第b03期78-91,共14页
Journal of Applied Meteorological Science
基金
国家重点科技攻关项目(9690807)
(2001BA610A0601)共同资助
