Arid
DOI10.1007/s00376-009-0390-8
Geochemical behaviour of the Tunisian background aerosols in Sirocco wind circulations
Azri, Chafai1; Abida, Habib1; Medhioub, Khaled2
通讯作者Azri, Chafai
来源期刊ADVANCES IN ATMOSPHERIC SCIENCES
ISSN0256-1530
EISSN1861-9533
出版年2009
卷号26期号:3页码:390-402
英文摘要

This study examines spatial and time evolutions of the principal constituents of the Tunisian background aerosols under Sirocco wind circulations. Aerosols coming from the Sahara Desert were found to be loaded with particulate matter, especially silicon. The aerosols were shown to have varying geochemical behaviour along the "South-North" displacement of the Saharan plumes, depending on the wind flow characteristics, geomorphologic features and the nature of soils swept by the wind. In the south and the center part of the country, the transfer of aerosol constituents to the soil (by gravity and/or impaction) was probably predominated by localized enrichment phenomena. The latter are reinforced by the effect of turbulent winds over bare soils, wind wakes and probably selective disintegration, especially in the vicinity of the geomorphologic features of central Tunisia. These relatively high features, extending over important distances, appear to be of paramount importance for the phenomena of redistribution of aerosol constituents even during periods without Sirocco wind circulations. In the northern section of the country, aerosol constituent concentrations dropped to almost 50%, in spite of the abundance of localized turbulent winds. This may be explained by the effect of forests and the relatively dense vegetation cover, which clearly reinforces the transfer phenomena to the soil and the attenuate of dust entrainment.


英文关键词aerosols Sahara Sirocco Tunisia turbulent winds
类型Article
语种英语
国家Tunisia
收录类别SCI-E
WOS记录号WOS:000265914800003
WOS关键词SAHARAN DUST EPISODES ; NORTH-AFRICAN DUST ; TRANSPORT ; DEPOSITION ; POLLUTION
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/159503
作者单位1.FSS, Dept Geol, Sfax 3000, Tunisia;
2.Inst Preparatory Engn Studies Sfax IPEIS, Sfax 3018, Tunisia
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GB/T 7714
Azri, Chafai,Abida, Habib,Medhioub, Khaled. Geochemical behaviour of the Tunisian background aerosols in Sirocco wind circulations[J],2009,26(3):390-402.
APA Azri, Chafai,Abida, Habib,&Medhioub, Khaled.(2009).Geochemical behaviour of the Tunisian background aerosols in Sirocco wind circulations.ADVANCES IN ATMOSPHERIC SCIENCES,26(3),390-402.
MLA Azri, Chafai,et al."Geochemical behaviour of the Tunisian background aerosols in Sirocco wind circulations".ADVANCES IN ATMOSPHERIC SCIENCES 26.3(2009):390-402.
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