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Evolution of the Total Lightning Activity in a Leading-Line

发布人:news  |  来自:本站  |  发布时间:2011-06-26 00:03:41  |  点击次数:2015
Citation: Liu, D. X., X. S. Qie, Y. J. Xiong, and G. L. Feng, 2011: Evolution of the total lightning activity
in a leading-line and trailing stratiform mesoscale convective system over Beijing. Adv. Atmos. Sci., 28(4),
866–878, doi: 10.1007/s00376-010-0001-8.


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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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