Evolution of the Total Lightning Activity in a Leading-Line and Trailing Stratiform Mesoscale Convective System over Beijing |
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Authors: | LIU Dongxi QIE Xiushu XIONG Yajun and FENG Guili |
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Institution: | Key Laboratory of Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Key Laboratory of Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Beijing Meteorological Bureau, Beijing 100089,Lightning Protection Center of Shandong, Jinan 250023 |
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Abstract: | Data from the Beijing SAFIR 3000 lightning detection system and Doppler radar provided some insights into the three-dimensional
lightning structure and evolution of a leading-line and trailing-stratiform (LLTS) mesoscale convective system (MCS) over
Beijing on 31 July 2007. Most of the lightning in the LLTS-MCS was intracloud (IC) lightning, while the mean ratio of positive
cloud-to-ground (+CG) lightning to -CG lightning was 1:4, which was higher than the average value from previous studies. The
majority of CG lightning occurred in the convective region of the radar echo, particularly at the leading edge of the front.
Little IC lightning and little +CG lightning occurred in the stratiform region. The distribution of the CG lightning indicated
that the storm had a tilted dipole structure given the wind shear or the tripole charge structure. During the storm’s development,
most of the IC lightning occurred at an altitude of ~9.5 km; the lightning rate reached its maximum at 10.5 km, the altitude
of IC lightning in the mature stage of the storm. When the thunderstorm began to dissipate, the altitude of the IC lightning
decreased gradually. The spatial distribution of lightning was well correlated with the rainfall on the ground, although the
peak value of rainfall appeared 75 min later than the peak lightning rate. |
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Keywords: | mesoscale convective system cloud to ground (CG) lightning intracloud (IC) lightning SAFIR 3000 |
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