Arid
DOI10.1016/j.catena.2013.06.017
Sources of PM2.5 impacting on Gran Canaria, Spain
Engelbrecht, Johann P.1; Menendez, Inmaculada2; Derbyshire, Edward3
通讯作者Engelbrecht, Johann P.
来源期刊CATENA
ISSN0341-8162
EISSN1872-6887
出版年2014
卷号117页码:119-132
英文摘要

This paper reports on sequential aerosol sample sets collected at the Campus de Tafira, University of Las Palmas de Gran Canaria (ULPGC), in 2010. Gran Canaria is located approximately 250 km off the coast of North Africa and at the northern margin of the dominant Saharan dust plumes being blown westward across the Atlantic Ocean. PM2" aerosol samples were collected on 47 mm filter substrates of Teflon, quartz fiber and Nuclepore, generally at weekly sampling intervals. Subsets of these were analyzed for their mass, as well as elemental and ionic compositions. The 2010 annual geometric mean PM2.5 concentration at Tafira was 6.2 mu g/m(3), with only two particularly dusty events. From a simultaneous PK study at the same site, a PM2.5/PM10 mass ratio of 0.35 was calculated.


Diagnostic chemical ratios for PM2.5, for both moderate and severe Saharan dust events (calimas) in 2010 are:


Al : si : k : Ti : Mn : Fe : Sr


1 : 2.818 : 0.330 : 0.012 : 0.847 : 0.0088


To better understand the mineralogy of the aerosols and for inter-comparison purposes, normative mineral compositions were calculated from the chemical compositions. Depending on their transport patterns, four source regions, each with a distinct mineralogical signature were distinguished. The Northwest to North sector (Oceanic NW) aerosols contain evaporites, secondary ammonium sulfate, lesser amounts of organic carbon, and minor amounts of quartz and other silicates. The North to Northeast sector (Europe NE) generated aerosols of evaporites, ammonium sulfate and organic carbon. The Northeast (Africa NE) sector, with influx of air from the Iberian Peninsula and North Africa, contained evaporites and secondary ammonium sulfate with some organic carbon, and minor amounts of silicates and quartz. In 2010, the main African transport pathway from the Sahara region and across northern Mali, northern Mauritania, Western Sahara and Morocco was responsible for elevated concentrations of mineral dust during calima events. (C) 2013 Elsevier B.V. All rights reserved.


英文关键词Gran Canaria calima events Airborne mineral dust Mineral dust in PM2.5 Dust mineralogy and chemistry Dust transport pathways Saharan dust sources
类型Article
语种英语
国家USA ; Spain ; England
收录类别SCI-E
WOS记录号WOS:000334481700013
WOS关键词SAHARAN-MINERAL-DUST ; AFRICAN DUST ; DESERT DUST ; OIL COMBUSTION ; SOURCE-REGIONS ; ATLANTIC ; AIR ; ISLANDS ; AEROSOLS ; PARTICLES
WOS类目Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向Geology ; Agriculture ; Water Resources
来源机构University of London ; Desert Research Institute
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/181294
作者单位1.Univ Nevada, Desert Res Inst, Reno, NV 89506 USA;
2.Univ Las Palmas Gran Canaria, Dept Phys, Las Palmas Gran Canaria, Spain;
3.Univ London, London WC1E 7HU, England
推荐引用方式
GB/T 7714
Engelbrecht, Johann P.,Menendez, Inmaculada,Derbyshire, Edward. Sources of PM2.5 impacting on Gran Canaria, Spain[J]. University of London, Desert Research Institute,2014,117:119-132.
APA Engelbrecht, Johann P.,Menendez, Inmaculada,&Derbyshire, Edward.(2014).Sources of PM2.5 impacting on Gran Canaria, Spain.CATENA,117,119-132.
MLA Engelbrecht, Johann P.,et al."Sources of PM2.5 impacting on Gran Canaria, Spain".CATENA 117(2014):119-132.
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