气象学报2024，Vol.82Issue(2)：222-235,14.DOI:10.11676/qxxb2024.20230079
闪电通道状态变化参数化的建立及截断和再击穿的数值模拟
Establishment of a parameterization of lightning channel state changes and numerical simulation of lightning cut-off and re-breakdown
摘要
Abstract
To improve the simulation capability of the numerical model for the fine lightning discharge process,complement the developing lightning detection technology,and explore the relationship between re-breakdown process and thunderstorm electrical parameters,a complete lightning parameterization scheme with a self-sustained charge neutrality is established.This scheme can simulate the cut-off and re-breakdown process of leader.Considering the polarity asymmetry,different extension velocities and initiation and propagation thresholds are set for positive and negative leaders respectively.New non-linear electrical parameters such as channel conductivity,average current,and charge are added to the scheme,and real-time updates of these parameters drive the development of lightning channel while different channel state change thresholds are also set.The real-time state changing leader channels,including decay,cut-off,and reactivation process,are simulated by all the above settings.Based on real-time changes in channel average current,longitudinal E-field and conductivity,charge is redistributed in the space to ensure the self-sustained charge neutrality of channels,which is an important basis for simulating the re-breakdown process.The new scheme is employed in the classical thunderstorm cloud model with tripolar charge structure,and the simulated IC flashes are in good agreement with existing observation facts in terms of channel structure,extinguishment and reactivation of the leader,and the polarity asymmetry of positive and negative leader.The verification against observation facts and some conceptual models indicates that the scheme is reasonable and advanced in simulating the complete lightning discharge process,including extinguishment and re-breakdown process under the premise of self-sustained charge neutrality.关键词
雷电物理学/闪电参数化/截断再击穿过程/极性不对称/自持电中性Key words
Lightning physics/Lightning parameterization/Decay and re-breakdown process/Polarity asymmetry/Self-sustained charge neutrality分类
天文与地球科学引用本文复制引用
张袁瞰,郑天雪,谭涌波,唐渤..闪电通道状态变化参数化的建立及截断和再击穿的数值模拟[J].气象学报,2024,82(2):222-235,14.基金项目
国家自然科学基金面上项目(42275075)、灾害天气国家重点实验室开放课题(2023LASW-A03)、江苏省气象局科研项目(ZD202412). （42275075）
