The Model Analysis of Lightning Charge Structure Characters and Attributions over Qinghai-Tibetan Plateau

  • GUO Fengxia ,
  • WANG Manfei ,
  • HUANG Zhaochu ,
  • LI Yang ,
  • MU Yijun ,
  • LIAN Chunhao ,
  • ZENG Fanhui
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  • 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, Jiangsu, China

Received date: 2017-09-12

  Online published: 2018-08-28

Abstract

To further recognize the particularity of thunderstorm over Qinghai-Tibetan Plateau (QTP), this paper has analyzed the primary attribution of charge distribution, and also predicted the microphysics and electrification occurring on 13 August 2003 in QTP, using a three-dimensional dynamics-electrification coupled model. The charging parameterization included both the graupel/hail-cloud/ice inductive charging mechanism and the graupel/hail-ice non-inductive charging mechanism. The charging processes between other large and small particles are small, so they were ignored in this study. The results indicated that the characteristics of thunderstorms in QTP are unique. The life period of the thouderstorm is short, and the positive cloud-to-ground flashes occur frequently. The updraft and downdraft are weaker, and solid precipitation is more than liquid precipitation. Cloud top of thunderstorms are low and warm cloud area is small. Meanwhile, the height of solid small particles (ice crystals, snow) is low. The solid large particles (gravel, hail) distributed widely and mainly grounded. The thunderstorms in QTP displays a vertical tripole charge structure, then transforms into dipole distribution during dissipate stage. total charge density shrinks, while the peaks of charge center is higher. The main positive charge center is located at 7~9 km (-40~-30℃), and the main negative charge center is located at 4~7 km (-10~0℃). The lower positive charge center is located at 2~3.5 km. And all the charge areas are uplifted with convection. The lower positive charge center occupies widely and it lasts a long time. The tripole distribution is referred to as non-inductive collisional separation between ice-phase microphysics. The main positive charge center is mainly formed by ice crystals, the main negative charge center and lower positive charge center are mainly formed by snow and graupel. The weakening of the non-inductive collisional charging mechanism between graupel and ice makes the lower positive charge center dissipate. The dipole one results from the precipitation of graupel particles. Because of the smaller warm cloud thickness, high effective liquid water content in mixed area, and lower the tropical tropopause, the overlap area of graupel and hail distribution is larger, so the lower positive charge is wide and last for a long time.

Cite this article

GUO Fengxia , WANG Manfei , HUANG Zhaochu , LI Yang , MU Yijun , LIAN Chunhao , ZENG Fanhui . The Model Analysis of Lightning Charge Structure Characters and Attributions over Qinghai-Tibetan Plateau[J]. Plateau Meteorology, 2018 , 37(4) : 911 -922 . DOI: 10.7522/j.issn.1000-0534.2018.00002

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