Analysis of the Relationships between Cloud-to-ground Lightning Density and Number of Thunderstorm Days in Yangjiang
WU Huabin
WANG Guangbo
ZENG Xianfeng
JIANG Shan
Abstract：Using the data of manual thunderstorm observations from 86 surface weather stations across the Guangdong province in 1964-2013 and lightning positioning data for the area of Yangjiang by a provin-cial lightning positioning system in 2007-2013,this paper analyzed the relationships between the distribu-tion characteristics of thunderstorm days(td)and the cloud-to-ground lightning density(Ng)in the city u-sing the mathematical statistics method.The results are shown as follows.For Guangdong,there is no signif-icant difference in the number of annual average thunderstorm days between the years 2007-2013 and the years 1984-2013,and the power correlation coefficient between Ng and td is the maximum within a radius of 16 km for the station of Yangjiang and a radius of 7 km for the station of Yangchun.A power function fitting equation,established by individual observation stations,is most suitable for the area of Yangjiang with the fitting effect passing the test of 0.05 significance level.For a 99％confidence level,the accuracy is 100％with an absolute error within±2.58SE(residual standard deviation).The estimated values thus obtained can be used as reference in the design of lightning protection device and the assessment of lightning-inflicted risks for Yangjiang.
Keywords：density of cloud-to-ground lightningthunderstorm dayKrikin interpolation methodresidual standard deviationYangjiang
Publication Date：2025-02-19
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)