气候变化领域集成服务门户(CCPortal): Electrostatic forces alter particle size distributions in atmospheric dust

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DOI	10.5194/acp-20-3181-2020
	Electrostatic forces alter particle size distributions in atmospheric dust
	Toth J.R.; Iii; Rajupet S.; Squire H.; Volbers B.; Zhou J.; Xie L.; Mohan Sankaran R.; Lacks D.J.
发表日期	2020
ISSN	1680-7316
起始页码	3181
结束页码	3190
卷号	20 期号:5
英文摘要	Large amounts of dust are lofted into the atmosphere from arid regions of the world before being transported up to thousands of kilometers. This atmospheric dust interacts with solar radiation and causes changes in the climate, with larger-sized particles having a heating effect, and smaller-sized particles having a cooling effect. Previous studies on the long-range transport of dust have found larger particles than expected, without a model to explain their transport. Here, we investigate the effect of electric fields on lofted airborne dust by blowing sand through a vertically oriented electric field, and characterizing the size distribution as a function of height. We also model this system, considering the gravitational, drag, and electrostatic forces on particles, to understand the effects of the electric field. Our results indicate that electric fields keep particles suspended at higher elevations and enrich the concentration of larger particles at higher elevations. We extend our model from the small-scale system to long-range atmospheric dust transport to develop insights into the effects of electric fields on size distributions of lofted dust in the atmosphere. We show that the presence of electric fields and the resulting electrostatic force on charged particles can help explain the transport of unexpectedly large particles and cause the size distribution to become more uniform as a function of elevation. Thus, our experimental and modeling results indicate that electrostatic forces may in some cases be relevant regarding the effect of atmospheric dust on the climate. © 2020 American Institute of Physics Inc.. All rights reserved.
语种	英语
scopus关键词	aerosol; atmospheric transport; concentration (composition); dust; particle size; size distribution; solar radiation
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141474
作者单位	Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland, OH 44106, United States; Key Laboratory of Mechanics on Disaster and Environment in Western China, Ministry of Education of China, Lanzhou, Gansu, 7300000, China; College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, Gansu, 7300000, China
推荐引用方式 GB/T 7714	Toth J.R.,Iii,Rajupet S.,et al. Electrostatic forces alter particle size distributions in atmospheric dust[J],2020,20(5).
APA	Toth J.R..,Iii.,Rajupet S..,Squire H..,Volbers B..,...&Lacks D.J..(2020).Electrostatic forces alter particle size distributions in atmospheric dust.Atmospheric Chemistry and Physics,20(5).
MLA	Toth J.R.,et al."Electrostatic forces alter particle size distributions in atmospheric dust".Atmospheric Chemistry and Physics 20.5(2020).