Low-frequency E-field Detection Array(LFEDA)-Construction and preliminary results

作     者：SHI DongDong ZHENG Dong ZHANG Yang ZHANG YiJun HUANG ZhiGang LU WeiTao CHEN ShaoDong YAN Xu 

作者机构：State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 China School of Atmospheric Physics Nanjing University of Information Science and Technology Nanjing 210044 China Guangzhou Institute of Tropical and Marine Meteorology Chinese Meteorological Administration Guangzhou 510080 China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2017年第60卷第10期

页      面：1896-1908页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41675005,91537290&41275008) the Basic Research Fund of Chinese Academy of Meteorological Sciences(Grant Nos.2016Z002&2015Z006) 

主　　题：LFEDA Locating algorithm Monte Carlo Artificial triggered lightning Radar reflectivity 

摘      要：In recent years, locating total lightning at the VLF/LF band has become one of the most important directions in lightning detection. The Low-frequency E-field Detection Array(LFEDA) consisting of nine fast antennas was developed by the Chinese Academy of Meteorological Sciences in Guangzhou between 2014 and 2015. This paper documents the composition of the LFEDA and a lightning-locating algorithm that applies to the low-frequency electric field radiated by lightning pulse discharge events(LPDEs). Theoretical simulation and objective assessment of the accuracy and detection efficiency of LFEDA have been done using Monte Carlo simulation and artificial triggered lightning experiment, respectively. The former results show that having a station in the network with a comparatively long baseline improves both the horizontal location accuracy in the direction perpendicular to the baseline and the vertical location accuracy along the baseline. The latter results show that detection efficiencies for triggered lightning flashes and return strokes are 100% and 95%, respectively. The average planar location error for return strokes of triggered lightning flashes is 102 m. By locating LPDEs in thunderstorms, we find that LPDEs are consistent with convective regions as indicated by strong reflectivity columns, and present a reasonable distribution in the vertical *** addition, the LFEDA can reveal an image of lightning development through mapping the channels of lightning. Based on three-dimensional locations, the vertical propagation speed of the preliminary breakdown and the changing trend of the leader s speed in an intra-cloud and a cloud-to-ground flash are investigated. The research results show that the LFEDA has the capability for three-dimensional location of lightning, which provides a new technique for researching lightning development characteristics and thunderstorm electricity.