globalchange  > 气候减缓与适应
DOI: 10.1002/2017JD027206
Scopus记录号: 2-s2.0-85041129649
论文题名:
Time Correlations of Lightning Flash Sequences in Thunderstorms Revealed by Fractal Analysis
作者: Gou X.; Chen M.; Zhang G.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期:2
起始页码: 1351
结束页码: 1362
语种: 英语
英文关键词: AF and FF scaling methods ; DFA analysis ; lightning flash ; VHF radiation
Scopus关键词: correlation ; detection method ; electric field ; fractal analysis ; heterogeneity ; lightning ; thunderstorm ; time series ; timescale ; Florida [United States] ; Kennedy Space Center ; United States
英文摘要: By using the data of lightning detection and ranging system at the Kennedy Space Center, the temporal fractal and correlation of interevent time series of lightning flash sequences in thunderstorms have been investigated with Allan factor (AF), Fano factor (FF), and detrended fluctuation analysis (DFA) methods. AF, FF, and DFA methods are powerful tools to detect the time-scaling structures and correlations in point processes. Totally 40 thunderstorms with distinguishing features of a single-cell storm and apparent increase and decrease in the total flash rate were selected for the analysis. It is found that the time-scaling exponents for AF (αAF) and FF (αFF) analyses are 1.62 and 0.95 in average, respectively, indicating a strong time correlation of the lightning flash sequences. DFA analysis shows that there is a crossover phenomenon—a crossover timescale (τc) ranging from 54 to 195 s with an average of 114 s. The occurrence of a lightning flash in a thunderstorm behaves randomly at timescales <τc but shows strong time correlation at scales >τc. Physically, these may imply that the establishment of an extensive strong electric field necessary for the occurrence of a lightning flash needs a timescale >τc, which behaves strongly time correlated. But the initiation of a lightning flash within a well-established extensive strong electric field may involve the heterogeneities of the electric field at a timescale <τc, which behave randomly. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114659
Appears in Collections:气候减缓与适应

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作者单位: College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou, China; Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong; Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, China

Recommended Citation:
Gou X.,Chen M.,Zhang G.. Time Correlations of Lightning Flash Sequences in Thunderstorms Revealed by Fractal Analysis[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(2)
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