Climatology of global lightning classified by stroke energy using WWLLN data
Climatology of global lightning classified by stroke energy using WWLLN data
复制标题
使用 WWLLN 数据按中风能量分类的全球闪电气候学
DOI：
10.1002/joc.4291
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Hiroyuki Iwasaki
中科院分区：
文献类型：
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作者：
春山純一;西堀俊幸;河野功;Hiroyuki Iwasaki
结合2009年4月至2014年4月全球闪电定位网（WWLLN）数据集每小时的探测效率，研究了基于雷击能量的雷电气候特征。发现5个地区强雷（雷击能量>90%）占总体闪电比例超过30%（高S比区域），1个地区弱雷（<10%）占总体闪电比例超过30%（高S比区域）。 30%（高W比区域）。高 S 比的地区之一是青藏高原。夏季午后，随着降雨量的增加，该地区的闪电活动和 S 比有所增加；然而，在闪电活动非常弱的网格中观察到较大的S比。其他四个高 S 比区域位于北半球和南半球副极地气候区的海洋上空。两半球寒冷季节，当降雨量增加时，闪电活动和S比均增加，呈现夜间极大值；然而，降雨量没有表现出日变化。在这里，在闪电活动非常弱的网格中也观察到了很大的 S 比。东太平洋地区以弱闪电活动为主。寒冷季节白天弱闪电活动和W比呈现增加趋势。 W比的季节变化几乎与降雨量一致；然而，W 比率的日变化却并非如此。在闪电活动非常弱的网格中也观察到了较大的W比值。
Climatological features of lightning, based on stroke energy, were studied by considering the hourly detection efficiency of the World Wide Lightning Location Network (WWLLN) data set from April 2009 to April 2014. Five regions were found in which the ratio of strong lightning (> 90th percentile of stroke energy) to overall lightning exceeded 30%(high S-ratio regions), and one region was determined in which the ratio of weak lightning (< 10th percentile) to overall lightning exceeded 30%(high W-ratio region). One region of high S-ratio was the Tibetan Plateau. Lightning activity and the S-ratio in this region increased during summer afternoons as rainfall increased; however, the large S-ratio was observed in the grid where lightning activity was very weak. The four other areas of high S-ratio were located over the ocean in the sub-polar climatic zones of the Northern and Southern Hemispheres. In cold seasons of the two hemispheres, when rainfall amount increased, both the lightning activity and the S-ratio increased, displaying nocturnal maxima; however, the amount of rainfall did not exhibit diurnal variation. Here, a large S-ratio was also observed in the grid where lightning activity was very weak. Weak lightning activity dominated in the East Pacific. The activity of weak lightning and the W-ratio showed a tendency to increase during daytime in the cold season. The seasonal variation of the W-ratio was almost in accordance with rainfall amount; however, diurnal variation of the W-ratio was not. A large value of the W-ratio was also observed in the grid where the lightning activity was very weak.