气候变化领域集成服务门户(CCPortal): Study on Dominant Parameters Determining Streamer Initiation From Hydrometeors in Thundercloud Fields

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DOI	10.1029/2021JD034936
	Study on Dominant Parameters Determining Streamer Initiation From Hydrometeors in Thundercloud Fields
	Hu J.; Ma Y.; Gao X.; Liu N.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:20
英文摘要	This study reports a study trying to find the dominant factor on streamer initiation from an isolated hydrometeor in thundercloud fields at 7 km altitude corresponding to an atmosphere pressure of about 0.453 atm. Three parameters are considered including hydrometeor size, shape, and electric quantity. The simulation results indicate that a larger hydrometeor is more likely to initiate a streamer discharge at a lower ambient field for noncharged hydrometeors. The charge on hydrometeor plays a prominent role when a charged hydrometeor has a smaller size, and it is easier to initiate a streamer in this case. At 0.25 Ek, a positive streamer discharge has been presented for a charged hydrometeor with a radius of 0.5 mm. The critical field to form streamer discharge for a column shape hydrometeor without charge is much smaller than that for a spherical hydrometeor. If smaller hydrometeors are charged, the critical field for a spherical hydrometeor becomes lower than that for a column one. The electric quantity charged on hydrometeor has little effect on the critical field for both spherical and column hydrometeors, when the hydrometeor size is larger enough. The charge on hydrometeor plays a dominant role in streamer initiation when hydrometeor is smaller, but hydrometeor shape becomes more important for larger hydrometeor. Streamer discharge can be predicted by Meek number, but stable streamer cannot be ensured. Streamer branch will be met when ambient field is lower than 0.25 Ek. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	ambient field; electric quantity; hydrometeor; Meek number; streamer initiation
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/236982
作者单位	College of Physics, Guizhou University, Guiyang, China; Department of Physics and Space Science Center, University of New Hampshire, Durham, NH, United States
推荐引用方式 GB/T 7714	Hu J.,Ma Y.,Gao X.,et al. Study on Dominant Parameters Determining Streamer Initiation From Hydrometeors in Thundercloud Fields[J],2021,126(20).
APA	Hu J.,Ma Y.,Gao X.,&Liu N..(2021).Study on Dominant Parameters Determining Streamer Initiation From Hydrometeors in Thundercloud Fields.Journal of Geophysical Research: Atmospheres,126(20).
MLA	Hu J.,et al."Study on Dominant Parameters Determining Streamer Initiation From Hydrometeors in Thundercloud Fields".Journal of Geophysical Research: Atmospheres 126.20(2021).