Concurrent Upward Lightning Flashes from Two Towers  

作　　者：JIANG Ru-Bin SUN Zhu-Ling WU Zhi-Jun 

机构地区：[1]Key Laboratory of Middle Atmosphere and Global Environment Observation,Institute of Atmospheric Physics,Chinese Academy of Sciences [2]Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology

出　　处：《Atmospheric and Oceanic Science Letters》2014年第3期260-264,共5页大气和海洋科学快报（英文版）

基　　金：supported by the National Basic Research Program of China (Grant No.2014CB441405);the National Natural Science Foundation of China (Grant No.41375012)

摘　　要：Upward lightning flashes initiated simultane- ously from two towers separated by a distance of 3420 m were analyzed in detail based on high-speed camera images and S-band Doppler radar echo intensity. Both discharges lasted more than 250 ms and were self-initiated from the towers in the form of upward positive leaders with a time difference of less than 4 ms. Abundant recoil leaders oc- curred transiently in the remnant channel sections during the development of the upward lightning. The number of recoil leaders over the lower tower was greater than over the higher tower. When the concurrent upward flashes occurred, the radar echo intensity in the area of the towers was no more than 45 dBZ and the towers were separately located beneath two echo centers with low altitudes of 2-3 kin.Upward lightning flashes initiated simultaneously from two towers separated by a distance of 3420 m were analyzed in detail based on high-speed camera images and S-band Doppler radar echo intensity.Both discharges lasted more than 250 ms and were self-initiated from the towers in the form of upward positive leaders with a time difference of less than 4 ms.Abundant recoil leaders occurred transiently in the remnant channel sections during the development of the upward lightning.The number of recoil leaders over the lower tower was greater than over the higher tower.When the concurrent upward flashes occurred,the radar echo intensity in the area of the towers was no more than 45 dBZ and the towers were separately located beneath two echo centers with low altitudes of 2–3 km.

关 键 词：towerupward lightningleaderdischarge 

分 类 号：P427.3[天文地球—大气科学及气象学]