ISSN 1006-9895

CN 11-1768/O4

Numerical simulation of the effects of thunderstorm charge distributions on the discharge characteristics of positive intracloud lightning flashes
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1.Key Laboratory of Meteorological Disaster,Ministry of Education KLME/ Joint International Research Laboratory of Climate and Environment Change ILCEC/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters CIC-FEMD/ Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science and Technology;2.Key Laboratory of Meteorological Disaster,Ministry of Education KLME/ Joint International Research Laboratory of Climate and Environment Change ILCEC/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters CIC-FEMD/ Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science Technology

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    Abstract:

    In this study, a stochastic lightning parameterization scheme is coupled into the dipole charge structure, and the parameters and positions of the main negative charge region are fixed. Positive intracloud flashes (+IC) initiating at different altitudes are simulated by adjusting the parameters (charge concentration and horizontal range) of the upper positive charge region, and then the relationships between the characteristics of +IC flashes and the distributions of thunderstorm charge are discussed. Simulation results indicate that under dipole charge structures, the elevation of the upper positive charge region can generate high-altitude +IC flashes consistent with observations. Different from normal IC flashes dominated by upward negative leaders and horizontal or slightly downward positive leaders, IC flashes initiated at high altitudes are characterized by long-distance downward positive leaders and horizontal or slightly upward negative leaders. With the elevation of the upper positive charge region, the initiation altitudes of +IC flashes increases. When the upper positive charge region is lifted to a certain altitude (in this paper, the lower boundary altitude of the upper positive charge region is 12 km), IC flashes are usually initiated from the main positive charge region, and the concentration and horizontal radius of the upper positive charge area have no significant effect on the initiation altitude of IC flashes. In addition, the length of positive or negative leader channels has a significant positive correlation with the concentration, horizontal radius of the charge region, and the distance between the initiation point and the negative or positive charge region.

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History
  • Received:May 08,2021
  • Revised:September 06,2021
  • Adopted:September 13,2021
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