气候变化领域集成服务门户(CCPortal): Microphysical Effects of Water Content and Temperature on the Triboelectrification of Volcanic Ash on Long Time Scales

CCPortal

DOI	10.1029/2019JD031498
	Microphysical Effects of Water Content and Temperature on the Triboelectrification of Volcanic Ash on Long Time Scales
	Méndez Harper J.; Courtland L.; Dufek J.; McAdams J.
发表日期	2020
ISSN	2169897X
卷号	125 期号:14
英文摘要	The effects of water and temperature on the triboelectrification of granular materials have been reported by numerous authors, but have not been studied robustly in the context of volcanic plumes. Here, we present the results of a set of experiments designed to elucidate how environmental conditions modulate the triboelectric characteristics of volcanic ash in the upper region of the convective column. We find that small amounts of water can reduce the charge collected by submillimeter-sized ash grains by up to an order of magnitude. Increasing temperature at a constant relative humidity also appears to decrease the amount of charge gained by particles. Analysis of our data shows that if particles undergo low-energy, low-frequency collisions in humid environments under minute-long time scales, charge dissipation dominates over charge accumulation. Thus, our work suggests that triboelectric charging may be an inefficient electrification mechanism outside of the gas-thrust region where collision energies and rates are high and residence times are low. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Charging; Electrostatics; Environment; Humidity; Triboelectric; Volcanic
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/185888
作者单位	Department of Physics, Emory University, Atlanta, GA, United States; Physics and Earth-Space Science, University of Indianapolis, Indianapolis, IN, United States; Department of Earth Sciences, University of Oregon, Eugene, OR, United States
推荐引用方式 GB/T 7714	Méndez Harper J.,Courtland L.,Dufek J.,et al. Microphysical Effects of Water Content and Temperature on the Triboelectrification of Volcanic Ash on Long Time Scales[J],2020,125(14).
APA	Méndez Harper J.,Courtland L.,Dufek J.,&McAdams J..(2020).Microphysical Effects of Water Content and Temperature on the Triboelectrification of Volcanic Ash on Long Time Scales.Journal of Geophysical Research: Atmospheres,125(14).
MLA	Méndez Harper J.,et al."Microphysical Effects of Water Content and Temperature on the Triboelectrification of Volcanic Ash on Long Time Scales".Journal of Geophysical Research: Atmospheres 125.14(2020).