气候变化领域集成服务门户(CCPortal): Wind Tunnel-Based Comparison of PM10 Emission Rates for Volcanic Ash and Glaciogenic Aerosol Sources Within Iceland

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DOI	10.1029/2020JD033392
	Wind Tunnel-Based Comparison of PM10 Emission Rates for Volcanic Ash and Glaciogenic Aerosol Sources Within Iceland
	Richards-Thomas T.; McKenna-Neuman C.
发表日期	2020
ISSN	2169897X
卷号	125 期号:24
英文摘要	Iceland contributes 30–40 million tons of mineral dust to the atmosphere each year. Emission events are linked to exceedingly high concentrations of PM10, poor air quality, and respiratory disease, particularly in Reykjavík. Volcaniclastic aerosols have unique microphysical properties, and usually are porous and highly angular, with large surface areas bearing ultrafine, nanoscale dustcoats. The large internal void space contributes to low particle density, believed to affect emission and deposition rates in the atmospheric boundary layer, as well as the range of transport. However, the aerodynamic and sedimentological factors that govern dust entrainment in these high-latitude settings are not well constrained empirically, providing little guidance for the parameterization of aerosol dispersion models. A series of laboratory wind tunnel simulations were carried out under full climate control to evaluate these effects for Icelandic samples collected from five active dust sources, inclusive of volcanic ash and glaciofluvial sediments. PM10 emission rates measured in this study are similar in magnitude to those obtained in a small number of field studies within selected high-latitude regions, and for volcanic ash using a PI-SWERL. The scaling with friction velocity is well described by the 1988 dust emission model of Gillette and Passi, while the parameterization appears to be strongly dependent on the median particle size. Sediments from the coarsest Icelandic dust sources were found to be most emissive, owing to the importance of particle impact, while the proportionate amount of PM10 within the test bed was not found to correlate with the emission rate. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	emission rate; high-latitude cold climate dust; volcaniclastic sediment; wind tunnel simulation
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/185585
作者单位	Trent Environmental Wind Tunnel Laboratory, School of the Environment, Trent University, Peterborough, ON, Canada
推荐引用方式 GB/T 7714	Richards-Thomas T.,McKenna-Neuman C.. Wind Tunnel-Based Comparison of PM10 Emission Rates for Volcanic Ash and Glaciogenic Aerosol Sources Within Iceland[J],2020,125(24).
APA	Richards-Thomas T.,&McKenna-Neuman C..(2020).Wind Tunnel-Based Comparison of PM10 Emission Rates for Volcanic Ash and Glaciogenic Aerosol Sources Within Iceland.Journal of Geophysical Research: Atmospheres,125(24).
MLA	Richards-Thomas T.,et al."Wind Tunnel-Based Comparison of PM10 Emission Rates for Volcanic Ash and Glaciogenic Aerosol Sources Within Iceland".Journal of Geophysical Research: Atmospheres 125.24(2020).