气候变化领域集成服务门户(CCPortal): Observations Show Charge Density of Volcanic Plumes is Higher Than Thunderstorms

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DOI	10.1029/2021JD035404
	Observations Show Charge Density of Volcanic Plumes is Higher Than Thunderstorms
	Haley S.; Behnke S.; Edens H.; Thomas R.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:19
英文摘要	We analyze slow electric field change and lightning mapping measurements to provide insight into the characteristics of volcanic lightning and the associated implications on charging processes and the charge structure of a Vulcanian eruption plume. Data were obtained during a multi-instrumental field campaign at Sakurajima volcano in 2015 when the Showa crater was active. We combine the electric field change and lightning mapping data from one explosive eruption on June 6, 2015 to identify individual flashes. From this, we interpret the flash type and polarity. In addition, the long-time constant of the electric field change instrument allowed measurement of the quasi-static field associated with charge separation in the eruption plume. We find that both intracloud and cloud-to-ground discharges occurred, and the polarity of cloud-to-ground discharges were all negative. The quasi-static field measurement showed the plume carried a net negative charge. We calculate both the total charge transferred by cloud-to-ground discharges and the net charge density of the eruption plume. We find that cloud-to-ground discharges transfer an average of −0.41C per flash and the net charge density was −33C/ (Formula presented.). The percent error is at least 200%, due to uncertainty in the antenna gain. We show that these estimates are consistent with lightning that is 100 m in length. Further, the average flash rate during the first 8 s following the onset of eruption was five flashes per second. After that time, the flash rate abruptly decreased, which may be related to the end of gas-thrust forcing. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	atmospheric electricity; volcanic lightning; vulcanian eruptions
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/236961
作者单位	Space Data Science and Systems, Los Alamos National Laboratory, Los Alamos, NM, United States; Space and Remote Sensing, Los Alamos National Laboratory, Los Alamos, NM, United States; Langmuir Laboratory, New Mexico Institute of Mining and Technology, Socorro, NM, United States; Electrical Engineering Department, New Mexico Institute of Mining and Technology, Socorro, NM, United States
推荐引用方式 GB/T 7714	Haley S.,Behnke S.,Edens H.,et al. Observations Show Charge Density of Volcanic Plumes is Higher Than Thunderstorms[J],2021,126(19).
APA	Haley S.,Behnke S.,Edens H.,&Thomas R..(2021).Observations Show Charge Density of Volcanic Plumes is Higher Than Thunderstorms.Journal of Geophysical Research: Atmospheres,126(19).
MLA	Haley S.,et al."Observations Show Charge Density of Volcanic Plumes is Higher Than Thunderstorms".Journal of Geophysical Research: Atmospheres 126.19(2021).