The Relationship of Lightning Location System Data and Artificial Observation Thunderstorm Days in Beijing

doi:10.11924/j.issn.1000-6850.casb18030028

Abstract

Abstract: To solve the problem that the number of thunderstorm days cannot be obtained after the artificial observation stopped in Beijing, the relationship between the data of lightning location system (LLS) and the artificial observation thunderstorm days in Beijing is studied. The LLS monitoring data around 20 artificial observation stations in Beijing from 2008 to 2011 were selected in this study. Taking each station as the center, 1km for the distance, the numbers of lightning and lightning days were calculated from the LLS monitoring data around each station with the radius (r) from 1 to 20 km. To find the optimal method for converting LLS data into the thunderstorm days, the lightning days were calculated by three methods and compared with the numbers of artificial observation thunderstorm days from two aspects, respectively. The three calculation methods were the direct substitution method, the ground flash density method and the binary method. The two comparison aspects were the annual mean lightning days of 20 stations and the annual mean lightning days of each station. The results showed that the number of the annual mean lightning days in LLS monitoring with r=13 km was the closest to the number of the annual mean thunderstorm days. For the results obtained by the three methods, the binary method was the best, followed by the direct substitution method, and the ground flash density method was the worst. For the single observation station, there was no unified function relationship between the ground flash density around each station and the number of artificial observation thunderstorm days. However, the number of thunderstorm days for each station was accurately determined by using the equivalent observation radius for each station from the direct substitution method. The results show the relationship between the LLS data and the days of artificial observation thunderstorm in Beijing, which enables the thunderstorm days to be continually used as the basic data in the lightning protection and research in Beijing area.

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