Characteristics of Cloud-to-ground Lightning of a Squall Line on April 28 2006
There was a typical squall line with gale and hailstone in Shandong Province on 28 April 2006, which caused more than USD 150 million loss. The characteristics of cloud-to-ground(CG) lightning in the squall line were studied in detail. The results show that positive CG flashes predominated in the whole lifetime, accounting for 54.7％. During the initial developing stage, CG flash rate was lower than 5fl/10min and all the CG flashes were positive. CG flash rates increased significantly up to 45fl/10min with the rapid development of the squall line, and the percentage of positive CG was more than 75％ during this period. The CG flash rate began to decrease but the percentage of negative CG flash increased gradually and exceeded that of positive CG during the mature and dissipating stages. Positive CG flashes were apt to at the right flank but negative ones were at the left flank. The advent of ground gale was associated with the region of dense positive CG flashes. Almost all positive CG flashes occurred near the strong echo regions which were in the front parts of the squall line. However, the negative CG flashes almost occurred in the stable weak echo regions. The total flash rate in the storm was very high up to 195fl/min, and its ratio of intra-cloud(IC) flashes to CG flashes was 35:1. The CG distribution features in the squall line were obviously different from the ordinary MCS. Finally the possible charge structure was discussed.
Guili Feng Xiushu Qie Jun Wang
Meteorological Bureau of Shandong Province, Jinan 250031, China;Cold and Arid Regions Environmental Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,China Meteorological Bureau of Shandong Province, Jinan 250031, China
国际会议
第13届国际大气电学会议(The 13th International Conference on Atmospheric Electricity)
北京
英文
2007-08-13（万方平台首次上网日期，不代表论文的发表时间）