| In the global natural disasters, the disaster caused by lightning is one of the world’s ten major natural disasters. This disaster caused that serious threat for human life and loss for property safety. Therefore, the application of a variety of detection data on the relationship between lightning and radar parameters has important significance for understanding and promoting the fine analysis and forecast of strong convective weather process. Firstly, according to the characteristics of the lightning location system error and the influence of position accuracy, using GIS data of satellite remote sensing in Shenzhen area, through the experimental study on complex terrain simulation in Shenzhen area on the time of arrival (TOA) of location accuracy. To improve the lightning data under complex surface accuracy. Then used of LIS data, WWLLN data and the Shenzhen lightning location data to analyze the lightning density distribution in Shenzhen area, and compared the detection efficiency differences between the three kinds of data. Finally used of Shenzhen lightning location data, Doppler radar data and conventional weather data to study the relationship between lightning frequency and radar echo in a strong squall line. The main results are as follows.(1) Through the simulation experiments to control the quality of the lightning location data of Shenzhen city. In order to verify the rationality of optimization model, this paper carried out a large number of simulation experiments, simulation times up to 5000 times. Seen from the simulation results, the optimization scheme is feasible, reliable, lightning location accuracy was significantly improved after optimization, and can be used to correct for the lightning location data. At the same time, this method can also be used for the lightning location network station location problem. According to the experience and the objective conditions to develop the location of possible solutions to evaluate the positioning error using a variety of station distribution plan will bring by simulation method in this paper, so as to select the scheme of optimal station distribution of lightning location system.(2) Used of LIS data, WWLLN data and the Shenzhen lightning location data to analyze the lightning density distribution in Shenzhen area, and compared the detection efficiency differences between the three kinds of data. By comparison, Shenzhen lightning location system data detection more efficient, and also more in line with the actual situation in Shenzhen area. Therefore, study on the lightning location data is more suitable for the thunderstorm activities in Shenzhen area. The region of northwest Shenzhen CG flash density is highest. The average density is 6/km2, the southeast region of the CG flash density is only half of the northwest area, the density of CG lightning from the northwest to the southeast, the northern inland to southern coastal presents from high to low distribution. In addition, the statistical calculations were performed on characteristics of radar echo in Shenzhen City. There have some characteristics of radar echo for the future study of precipitation characteristics in Shenzhen area.(3) Using the data of Shenzhen Doppler weather radar and lightning location data to analyze a strong squall line process happened in April 27,2012, and some conclusions are obtained as follows. Positive and negative CG lightning is mainly distributed in the strong echo region of>30dBZ, a small amount of positive CG lightning appeared in the area of weak echo region. But judging from the whole process, lightning distribution and strong echo area showed a good relationship. The maximum height of echo top trends also corresponds to the lightning frequency. Radar echo intensity at-10℃,-15℃ and-20℃ height of every shift corresponds to the leaping development of lightning frequency, the temperature of-20℃ height have the best correlation between lightning frequency and echo intensity. At the height of-5℃,-10℃,-15℃ and-20℃ four temperature levels, the echo area of 35dBZ and the CG flash is a good correlation. The highest correlation coefficient is the strong echo area of more than 40dBZ at the-5℃ levels. |
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