Plateau Meteorology

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2016 , Vol. 35 >Issue 4: 1123 - 1134

DOI: https://doi.org/10.7522/j.issn.1000-0534.2015.00070

Characteristics of Charge Sources Retrieved from the Multi-Station ynchronous Electric Field Change Measurements of Negative Return-Strokes

  • WU Zhijun ,
  • QIE Xiushu ,
  • WANG Dongfang
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  • Key Laboratory of Middle Atmosphere and Global Environment Observation, Institude of Atmospheric Physics, Chinese Academy of Science, Beijing 100029, China;2. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2014-12-31

  Online published: 2016-08-28

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Abstract

Using the measurements from slow and fast antenna of 7 stations synchronized by GPS during a thunderstorm which passed over Beijing Lightning NETwork (BLNET) on 9 August 2011, the magnitude and location of charge neutralized by 127 return strokes of 51 negative cloud-to-ground (CG) lightning flashes are fitted by using nonlinear least-squares fitting algorithm after Monte Carlo data processing and correction in advance. The fitting results were analyzed from several aspects shown as below. (1) For the charge sources neutralized by the strokes in one multi-stroke negative CG lightning, the horizontal distribution range Le and the vertical distribution range ΔHe was 13.0±9.3 km and 2.1±1.7 km respectively, and the ratio Le/ΔHe was 61.2±278.5. As the vertical range ΔHe increased, the horizontal range Le and the ratio Le/ΔHe decreased. (2) When the thunderstorm evolved from developing stage into mature stage, the maximum height of the stroke charge sources raised up gradually. When the thunderstorm evolved into dissipating stage, the maximum height of the stroke charge sources significantly became less than before. Throughout this period, the minimum height of the stroke charge sources kept around 5 km and the horizontal locations moved from northwest to southeast while the thunderstorm moved in the same direction. (3) The superposition of the charge sources and the radar echo showed the charge sources of negative return-stroke were mainly concentrated inside the cloud region with radar reflectivity higher than 25 dBZ. The charge sources with height more than 7 km accounted for 34% of the total and were concentrated inside updrafts of convection, while the charge sources with height less than 7 km were about 66% and located both inside and outside updrafts of convection.

Key words： Beijing Lightning NE; Negative cloud-to-gr; Charge sources neutr; Charge characteristi

Cite this article

WU Zhijun , QIE Xiushu , WANG Dongfang . Characteristics of Charge Sources Retrieved from the Multi-Station ynchronous Electric Field Change Measurements of Negative Return-Strokes[J]. Plateau Meteorology, 2016 , 35(4) : 1123 -1134 . DOI: 10.7522/j.issn.1000-0534.2015.00070

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