Research on the Characteristics of Cloud-to-Ground Lightning and Its Relationship with Radar Characteristics in Jiangxi Province
Using the Doppler weather radar and cloud-to-ground(CG)lightning observation data in Jiangxi Province from March to September in 2013-2020,we carried out a statistical analysis on the distribution characteristics of lightning and its relationship with the main features of radar.The results show that the CG lightning frequency in Jiangxi Province gradually decreases from the northeast to the southwest,and the Poyang Lake Plain in the north is the area with high CG lightning frequency.The CG lightning fre-quency has obvious seasonal and diurnal variation characteristics,and the total CG lightning frequency reaches the peak of one day at 16:00 BT.The relationship between CG lightning frequency and the low-level(3 km)radar echo intensity can be described by a logarithmic fitting equation.The number of CG lightning frequency is positively correlated to the variation trend of the low-level(3 km)radar echo area,and the stronger the echo,the stronger the correlation.However,there is a phase difference between the two,and the increase of the CG lightning frequency precedes the increase of the echo area by about 57％-60％.In most cases,the increase in both of CG lightning frequency and echo area can be found within 18 minutes.The boxplot features show that with the increase of the echo intensity,the extension height of the echo is lowered correspondingly,but the echo thickness is added slightly.Thus,the radar echo characteristics of the 10 km radius range around the CG lightning occurrence grid point,where the radar echo intensities are different,are obtained.
万方数据
维普
