The one-dimensional time-varying model of thundercloud electrificationhas been used for the simulating two thunderstorm processes using the primarily observations of CCOPE and STEPS, and discussing the effect of pellet flux, surface temperature and reversal temperature on electrical process of thundercloudfrom sensitivity test. In the model, Fletcher and Hallett-Mossop glaciation mechanisms havebeen adoptedas the ice glaciation mechanismof crystal. The numerical simulation results show that, the site of the vertical field extremes in the results simulated by using the radiosonde observation data of CCOPE and STEPS has good consistency with surveyed results, but the simulated extremes are larger thansurveyed extremes. Sensitivity tests results show that,with pellet flux increasing, the time of the first lightning flash will be decreased, the lightning flash frequency will be increased. With the surface temperature increasing, the vertical thickness of negative charge will be decreased, the biggest density of positive and negative chargeswill be increased. When the reversal temperature is lower, the range of negative charge carried by ice crystal is larger. In the model, when the surface temperature is 32 ℃ and the reversal temperature is lower than -26 ℃, there will be a reversed-polarity charge structure in the thundercloud. The model can simulate the charge structure and spatial-temporal distributions of electric fieldintuitively.
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