气候变化领域集成服务门户(CCPortal): Estimation of the IC to CG Ratio Using JEM-GLIMS and Ground-Based Lightning Network Data

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DOI	10.1029/2019JD032195
	Estimation of the IC to CG Ratio Using JEM-GLIMS and Ground-Based Lightning Network Data
	Bandholnopparat K.; Sato M.; Adachi T.; Ushio T.; Takahashi Y.
发表日期	2020
ISSN	2169897X
卷号	125 期号:23
英文摘要	The occurrence ratio of intracloud (IC) to cloud-to-ground (CG) discharges, which is denoted by Z-ratio, is the crucial parameter for the studies on the global electric circuit. However, the latitudinal and regional dependences of Z-ratio are not fully clarified. Therefore, using optical data obtained by the Global Lightning and Sprite Measurements on Japanese Experiment Module (JEM-GLIMS), we distinguished the lightning discharge type, that is, IC, positive CG (+CG), and negative CG (−CG) discharges, and statistically estimated the Z-ratio. We analyzed 8,354 lightning events that obtained by JEM-GLIMS observation and succeeded in identifying 4,431 IC discharges, 597 +CG discharges, and 3,326 −CG discharges. From this result, we calculated the Z-ratio over many regions around the world and estimated its latitudinal and regional dependences. It is found that the Z-ratio over the continental area is larger than the oceanic area. We also found that the Z-ratio significantly decreases with the latitude, which is generally comparable to the results shown in the previous studies. The estimated Z-ratio varies from 2.9–0.29 from the equator to 50° latitude, and the global mean value is 1.6. The regional dependence of Z-ratio derived from this study can be combined with the CG lightning data provided by the ground-based lightning detection networks to estimate the occurrence number of IC discharges. Then, the occurrence number of both IC and CG discharges can be used for calculating a more accurate estimation of the total lightning currents in the global electric circuit. © 2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185618
作者单位	Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Pathum Thani, Thailand; Faculty of Science, Hokkaido University, Sapporo, Japan; Meteorological Research Institute, Tsukuba, Japan; Department of Aerospace Engineering, Tokyo Metropolitan University, Hino, Japan
推荐引用方式 GB/T 7714	Bandholnopparat K.,Sato M.,Adachi T.,et al. Estimation of the IC to CG Ratio Using JEM-GLIMS and Ground-Based Lightning Network Data[J],2020,125(23).
APA	Bandholnopparat K.,Sato M.,Adachi T.,Ushio T.,&Takahashi Y..(2020).Estimation of the IC to CG Ratio Using JEM-GLIMS and Ground-Based Lightning Network Data.Journal of Geophysical Research: Atmospheres,125(23).
MLA	Bandholnopparat K.,et al."Estimation of the IC to CG Ratio Using JEM-GLIMS and Ground-Based Lightning Network Data".Journal of Geophysical Research: Atmospheres 125.23(2020).