科研之友
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摘要
We use the World Wide Lightning Location Network to investigate lightning strike variations in 8years of categories 4 and 5 tropical cyclones. A cross-correlation analysis is performed between the lightning and maximum sustained wind variations, giving lag and lead times related to the peak linear correlation for each tropical cyclone. A previous study of 58 cyclones by Price et al. (2009) is reexamined using the International Best Track Archive for Climate Stewardship database for the maximum sustained wind speeds of each tropical cyclone showing a moderate to strong correlation between lightning and wind variations. An 8year data set of 144 tropical cyclones are analyzed in the same way, with a 10 degrees square window, giving similar results to the smaller data set. Using a radial lightning collection window of < 500km, we confirm the general results of previous studies that lightning can be used on a approximate to 1day timescale to predict the evolution of the winds in tropical cyclones. Investigation of different lightning collection window sizes indicates that the lightning lead times are highly dependent upon the window size. Smaller collection windows have modal lightning lead times of approximate to 2.75 and 0 days, indicating that the lightning location inside the cyclone is as important as the total lightning variation. We have also performed a fixed time lag correlation which shows that preexisting knowledge of what time lag to use is needed in order to use this approach as a predictive tool.
- 出版日期2015-5-16
