Effects of Channel-induced Charge on Discharge Activity Characteristics

Yu Mengying; Tan Yongbo; Shi Zheng; Liu Jun; Wang Mengyi; Zheng Tianxue

doi:10.11898/1001-7313.20190110

Vol.30, NO.1, 2019

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Article Navigation > Journal of Applied Meteorological Science > 2019 > 30(1): 105-116

Yu Mengying, Tan Yongbo, Shi Zheng, et al. Effects of channel-induced charge on discharge activity characteristics. J Appl Meteor Sci, 2019, 30(1): 105-116. DOI: 10.11898/1001-7313.20190110.

Citation:

Yu Mengying, Tan Yongbo, Shi Zheng, et al. Effects of channel-induced charge on discharge activity characteristics. J Appl Meteor Sci, 2019, 30(1): 105-116. DOI: 10.11898/1001-7313.20190110.

Yu Mengying, Tan Yongbo, Shi Zheng, et al. Effects of channel-induced charge on discharge activity characteristics. J Appl Meteor Sci, 2019, 30(1): 105-116. DOI: 10.11898/1001-7313.20190110.

Citation:

Yu Mengying, Tan Yongbo, Shi Zheng, et al. Effects of channel-induced charge on discharge activity characteristics. J Appl Meteor Sci, 2019, 30(1): 105-116. DOI: 10.11898/1001-7313.20190110.

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Effects of Channel-induced Charge on Discharge Activity Characteristics

DOI: 10.11898/1001-7313.20190110

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, Nanjing 210044

Received Date: 2018-08-02
Rev Recd Date: 2018-09-05
Publish Date: 2019-01-31

Abstract

Abstract

In order to explore effects of different polarity charge implantation method on the discharge of thunderstorm clouds in the charge-replacement scheme after lightning discharge, a batch of sensitive experiments are implemented by changing the channel-induced charge to simulate a typical thunderstorm case in Nanjing, based on existing three-dimensional (3-D) thunderstorm cloud electrification and discharge patterns. Eeffects of thunderstorm cloud discharge are discussed from the perspective of space charge structure after discharge, lightning channel length, lightning frequency and type. Simulations show that the amount of induced charge by the lightning channel has a significant effect on the spatial charge structure distribution and the length of the intra-cloud flash channel. As the amount of induced charge in the channel increases, the number of lattice points where the polarity of the space charge is reversed before and after discharge increases, and the space charge structure becomes more complex, which in turn increases the intra-cloud flash with a shorter length of the lightning channel. The space charge structure is disordered, and it becomes more difficult for a wide range of identical-polar charge stacks to form during the development process. Meanwhile, it is also difficult for the lightning channel to pass through charge stack with the same polarity during the propagation process, and therefore the intra-cloud flash channel is limited to a pair of smaller heteropolar charge stacks. Eventually, the frequency of intra-cloud flashes that leads to shorter lightning channel lengths increases. The total amount of channel induced charge accumulation under different induction control multiples can be considered approximately the same within the error tolerance. The frequency of intra-cloud flashes is negatively correlated with the average cumulative amount of channel charges in different lightning channel induced charges:When the average cumulative amount of channel induced charges increases, the frequency of intra-cloud flashes will decrease. The change of the induced charge amount in the channel makes the charge distribution of the space charge region unbalanced. The frequency and type of the cloud-to-ground flash are affected by many factors, and the changing pattern is not obvious. Therefore, the channel-induced charge amount has little correlation with the frequency and type of cloud-to-ground flashes.
- channel-induced charge;
- charge structure;
- intra-cloud flash channel length;
- lightning frequency

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References(47)

Figures and Tables

Fig. 1 Environmental stratification curve(a) and vertical wind profile(b)

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Fig. 2 The variation trend of spatial charge polarity reversal lattice points with lightning order under different induction control multiples

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图 3 不同感应控制倍数下t=21 min，y=42 km时电荷结构剖面

(水平横线代表 0℃，-13.8℃，-40℃等温线；粗黑线代表雷暴云轮廓)

Fig. 3 Cross-section of the charge structure when t=21 min, y=42 km

(isotherms of 0℃, -13.8℃, -40℃ are shown, thick black lines show the contour structure of the thundercloud)

DownLoad: Full-Size Img PowerPoint

图 4 云闪的通道感应电荷平均累积量、通道平均长度及闪电频次随时间变化

(a)云闪通道感应电荷平均累积量，(b)云闪通道平均长度，(c)云闪频次

Fig. 4 The average cumulative amount of channel-induced charge, mean channel length, and lightning frequency change over time in the intra-cloud flash

(a)the average cumulative amount of induced charges of the intra-cloud flash channel, (b)the average length of the intra-cloud flash channel, (c)the frequency of intra-cloud flash

DownLoad: Full-Size Img PowerPoint

图 5 不同感应控制倍数下先导长度对应的云闪发生率占总云闪发生率的百分比

(a)云闪通道长度在1~321个格点处，(b)云闪通道长度在1~42个格点处

Fig. 5 Ratio of intra-cloud flash of channel lengths to total intra-cloud flash under different induction control multiples

(a)channel lengths of the intra-cloud flash at 1-321 grid points, (b)channel lengths of the intra-cloud flash at 1-42 grid points

DownLoad: Full-Size Img PowerPoint

Fig. 6 Trigger height of small channel length varying with time under different induction control multiples

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Fig. 7 Charge of the top shield, main positive and negative, and bottom positive charge in the early(a), mature(b), and dissipative(c) phases of thunderstorms at various induction control times

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Table 1 The average charge accumulation, intra-cloud flash frequency and channel induced charge accumulation under different induction control multiples

感应控制倍数α	电荷平均累积量/C	云闪频次	通道感应电荷累积量/C
0.3	6.73	1041	6684.5
0.4	6.73	911	7454.1
0.5	10.50	747	8355.5
0.6	10.30	801	8320.1
0.7	11.16	774	8644.9
1	15.30	623	9567.9

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Table 2 The total and the positive/negative ground flash frequency in different induction control multiples

感应控制倍数α	总地闪频次	正地闪频次	负地闪频次
0.3	194	58	136
0.4	158	102	56
0.5	139	93	46
0.6	153	96	57
0.7	160	47	113
1	117	40	77

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