Beijing Lightning Network (BLNET) and the observation on preliminary breakdown processes

Publication date: 1 May 2016
Source:Atmospheric Research, Volume 171
Author(s): Yu Wang, Xiushu Qie, Dongfang Wang, Mingyuan Liu, Debin Su, Zhichao Wang, Dongxia Liu, Zhijun Wu, Zhuling Sun, Ye Tian
Beijing Lightning Network (BLNET), a regional multi-frequency-band lightning detection and location network, has been developed for both research and operational purposes. The network consisted of 15 stations in 2014, covering an area of about 100km×85km in Beijing area. In this paper, we present the configuration of the network and the detailed description on the sensors for the first time. The Chan algorithm and Levenberg–Marquardt method are adopted jointly in the lightning location algorithm. The Monte Carlo simulation reveals that the horizontal and the vertical location errors within BLNET coverage are less than 300m and 600m, respectively. The comparison of total lightning location results with the corresponding radar reflectivity for a thunderstorm case indicates that BLNET has a good capability to track thunderstorms in the Beijing area. Besides, we examine the electric field waveforms of the preliminary breakdown process (PBP) of 111 −CG flashes, 92 +CG flashes, 22 normal-polarity IC flashes and 22 inverted-polarity IC flashes. Statistics on the time interval between the largest PBP pulse and the corresponding first RS pulse for CG flash (PB–RS interval), the ratio of the largest PBP pulse to the corresponding first RS pulse for CG flash (PB/RS ratio), the pulse width for individual pulse in the PBP train (Tw) and the time interval between successive pulses in the PBP train (Ti) are presented. The 3D location result shows that the PBP of a −CG flash initiates at an altitude of ~6km and propagates downward to ~3km with a vertical speed of 5.9×10⁵m/s. The initial 10ms of an IC flash is found to start at ~7.2km and develop upward to ~10km. The vertical propagation speed is estimated to be 4.8×10⁵m/s during the first 6ms. A PBP with relatively clear branched 3D structure is presented and discussed in the end of the paper. The average 3D propagation speed of two branches is estimated to be 2.1×10⁶m/s and 2.6×10⁶m/s, respectively.



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