气候变化领域集成服务门户(CCPortal): Sources, frequency, and chemical nature of dust events impacting the United States East Coast

CCPortal

DOI	10.1016/j.atmosenv.2020.117456
	Sources, frequency, and chemical nature of dust events impacting the United States East Coast
	Aldhaif A.M.; Lopez D.H.; Dadashazar H.; Sorooshian A.
发表日期	2020
ISSN	1352-2310
卷号	231
英文摘要	This study examines 14 years (2004–2017) of surface aerosol composition data from the EPA IMPROVE network with a focus on the monthly profile, sources, and chemical nature of extreme dust events (>92nd percentile of fine soil concentration each month) impacting ten sites along the United States East Coast ranging in latitude from Florida to Maine. Based on trajectory, remote sensing, and reanalysis data, dust events were categorized into four source categories: African, Asian, Mix (African + Asian), and Other (anything other than African and Asian). The results reveal that extreme dust events account for between 3.3% and 4.6% of total available days depending on the site. March-April-May (MAM) had the most (174) dust events, followed by June-July-August (JJA) with 172, and then by September-October-November (SON) with 160 and December-January-February (DFJ) with 150. There is a variability in the predominant dust sources based on latitude, with African and Other sources more influential from North Carolina to the south, while Asian and Other were most important from New Jersey to the north. The Mix category is consistently the least frequent dust category at all sites. The African dust category was linked to the highest fine soil levels across the entire East Coast relative to other sources regardless of location. JJA is mostly impacted by African dust for sites ranging from Florida to New Jersey, while MAM is dominated by Asian dust for all sites. Mix events occurred mostly between April and October and Other events were most common outside of MAM and JJA seasons. Seven out of ten sites had Other as the most dominant source. Aerosol constituents organic carbon (OC) and elemental carbon (EC) had higher average concentrations in Other events (2.39 ± 0.78 μg m−3 and 0.79 ± 0.81 μg m−3, respectively) as compared to the other three source categories, suggestive of regional anthropogenic emissions. Moreover, the ratios of elements (Si:Al, K:Fe, Fe:Ca, Al:Ca) contributing to fine soil and PM2.5:PM10 exhibited distinct values depending on the dust source category and the site. This study builds on the growing evidence of the importance of long-range transport of dust in impacting distant regions and how a variety of sources can impact the U.S. East Coast at all times of the year. © 2020 Elsevier Ltd
英文关键词	ACTIVATE; African dust; Asian dust; Dust; EVS-3; IMPROVE
语种	英语
scopus关键词	Aerosols; Organic carbon; Remote sensing; Soils; Aerosol composition; Anthropogenic emissions; Average concentration; Chemical nature; Elemental carbon; Long range transport; North Carolina; Soil concentrations; Dust; aluminum; calcium; carbon; iron; organic carbon; potassium; silicon; aerosol; aerosol composition; anthropogenic source; dust; elemental carbon; long range transport; organic carbon; particulate matter; pollutant source; spatiotemporal analysis; aerosol; Africa; air pollution; Article; Asia; concentration (parameter); dust; environmental exposure; environmental impact; Florida; latitude; Maine; New Jersey; North Carolina; particle size; particulate matter; priority journal; seasonal variation; soil; United States; Atlantic Coast [North America]; Atlantic Coast [United States]; United States
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129492
作者单位	Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ, United States; Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ, United States
推荐引用方式 GB/T 7714	Aldhaif A.M.,Lopez D.H.,Dadashazar H.,et al. Sources, frequency, and chemical nature of dust events impacting the United States East Coast[J],2020,231.
APA	Aldhaif A.M.,Lopez D.H.,Dadashazar H.,&Sorooshian A..(2020).Sources, frequency, and chemical nature of dust events impacting the United States East Coast.Atmospheric Environment,231.
MLA	Aldhaif A.M.,et al."Sources, frequency, and chemical nature of dust events impacting the United States East Coast".Atmospheric Environment 231(2020).