摘要
利用三维强风暴动力 -电耦合模式 ,数值模拟了风暴演变过程中电活动对冰雹增长及地面降雹的影响 .结果指出 ,带电冰雹与云内强电场作用使地面降雹量增加约 5 0 % ,雹块直径增大 0 .7mm ,降雹时间滞后约 3min .文中还讨论了强电场通过对水成物降落速度的调制来影响冰雹微观增长过程 ,即主要是影响碰并过程和冰雹融化过程 .电活动使冰雹源、汇总量都减少 ,但汇总量减少更多 ,总体效果使冰雹总量增加 ,数目减少 ,冰雹长得更大 。
Using the 3D dynamics electrification coupled model, we simulate the effect of electric activity on hail growth and shooting on the surface during thunderstorms. The results indicate that the hail with charge and strong electric field make precipitation and diameter of hail particles on the ground increase 50% and 0.7mm , respectively, and the time of hail shooting lag 3 minutes. Effect of microphysical growth process of hail through the strong electric field act on the fall speed of precipitation elements is discussed. Electric action mainly influences collection and melting process of hail. Source and sink of hail decrease, and sink decrease more. So, the total amount of precipitation of hail will increase, and the number of hail particles decreases due to electrical effects. It means that hail particles become bigger and eaier to fall.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第1期25-32,共8页
Chinese Journal of Geophysics
基金
中国科学院知识创新重大项目(KZCX1 SW 0 4)
中国科学院寒区旱区环境与工程研究所创新项目(2 10 0 3 7)
关键词
雷暴电活动
冰雹
数值模拟
电荷结构
微观相变
Numerical model of thunderstorm,Charge structure, Growth of hail particles, Phase transformation of microphysical process
