湖泊与陆地雷电参数分布特征及其对比分析

doi:10.3969/j.issn.1673-503X.2019.06.017

Abstract

Abstract: The distribution characteristics of cloud-to-ground (CG) lightning frequency,polarity,lightning density,lightning current amplitude,and gradient of wavefront of lakes and lands were compared using mathematical statistics method based on the data monitored by Lightning Location System (LLS) in Hubei province from January 1,2007 to December 31,2016.The results show that the temporal variation trends of lightning parameters for lakes and lands are similar.Lightning frequency decreased insignificantly in the last 10 years,and the percentage of positive CG lightning showed an increasing tendency.There are more lightning frequencies on lands than that over the lakes,and lightning frequency of lakes and lands are significantly different in spring and summer,in which lightning frequency of lands in summer is 21.1% higher than that of lakes.The diurnal variation of lightning frequency for lakes and lands appears to be unimodal,and lightning frequency of lands is 39.7%,which is higher than that of lakes from 13 p.m.to 18 p.m.The average CG lightning density of lakes is smaller than that of lands,and the average CG lightning densities of lakes and lands are 2.96/(km²·a) and 3.47/(km²·a),respectively.The average lightning current amplitude of lakes is larger than that of lands.The average wavefront steepnesses of lightning current for lakes and lands have little differences,and the difference between them is generally less than 1 kA/μs.

Key words: Lakes, Lands, Lightning parameters

CLC Number:

P446

WANG Xue-liang, YU Tian-ye, HE Shan. Distribution characteristics and comparative analysis of lightning parameters between lakes and lands[J]. Journal of Meteorology and Environment, 2019, 35(6): 132-138.

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Distribution characteristics and comparative analysis of lightning parameters between lakes and lands

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