摘要
利用多普勒双偏振多参数气象雷达,结合地面LD-II闪电定位仪资料,对一次中尺度对流强风暴云的雷电过程进行观测分析。结果表明,闪电发生前后,对流云上部的差分传播相移率KDP、差分反射率因子ZDR和差相移ΦDP有明显的变化,反映出云中冰相粒子排列取向随云中电场分布结构的变化而变化。这种闪电发生时冰相粒子排列取向存在明显变化的信息,说明用多参数气象雷达探测的技术以及开展雷电预警预报是可行的。
Using an X-band Doppler dual-polarized meteorological radar, in conjunction with a net-worked ground LD-Ⅱ lightning detector system, a lightning process in a mesoscale convective system in Jilin Province on 15th May 2007 was measured and analyzed. The results show that there were discernable changes in specific differential phase shift KDp, differential reflectivity factor ZDR and differential phase shift φDP in the top of the convective cloud before and after the occurrence of lightning, which indicates that the orientation of ice particles in the thunder cloud changed with changes in the distributive structure of the electric field within the cloud. This discernable direction information of ice particles in the thunder cloud around the lightning has proved the application possibility of the multi-parameter me-teorological radar technology to the nowcasting and monitoring of lightning.
出处
《大气科学学报》
CSCD
北大核心
2009年第6期839-850,共12页
Transactions of Atmospheric Sciences
基金
国家自然科学基金重点资助项目(40875080)
国家科技支撑计划项目(2006BAC12B01-01)
中国科学院知识创新工程青年人才领域前沿项目(IAP07408)
中国气象局与吉林省人民政府人工影响天气联合开放实验室课题(0603)
关键词
闪电
偏振雷达
差分传播相移率
差分反射率
差相移
lightning
polarization radar： specific differential phase shift
differential reflectivity
differential phase
