气候变化领域集成服务门户(CCPortal): Rapid changes of dust geochemistry in the Saharan Air Layer linked to sources and meteorology

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DOI	10.1016/j.atmosenv.2019.117186
	Rapid changes of dust geochemistry in the Saharan Air Layer linked to sources and meteorology
	Rodríguez S.; Calzolai G.; Chiari M.; Nava S.; García M.I.; López-Solano J.; Marrero C.; López-Darias J.; Cuevas E.; Alonso-Pérez S.; Prats N.; Amato F.; Lucarelli F.; Querol X.
发表日期	2020
ISSN	1352-2310
卷号	223
英文摘要	Based at Izaña Observatory (~2400 m a.s.l. in Tenerife), we performed 1-h resolution measurements of elemental composition of dust in the Saharan Air Layer (SAL) and studied the variability of the ratios of these elements to aluminium (elemental ratios). In a period (~1 week) of continuous dust presence (50–200 μg/m3), we observed rapid variations of dust composition; some elemental ratios changed by a factor 2 in a few (5–8) hours. The lowest variability (Normalized Variability Range, %) was found for Si/Al (9%) and Fe/Al (9%), followed by the ratios of K, Ti, Mg, Mn, Ca and Sr to Al (20–80%), and the highest for S/Al, Na/Al and Cl/Al (110–160%) and a number of trace metals (Cr, Cu, Ni, Zn, Zr) and Br (>200%). This variability was induced by the alternating impacts of three of the large North African dust sources: NE Algeria (rich in evaporite minerals bearing Ca, S, Sr, K and Mg and in illite mineral), Western Sahara to Bechar region (containing Na, S and Cl rich Yermosol soils) and SW Sahara – Western Sahel (rich in illite and hematite). We traced the variability in large-scale meteorology using the so-called North African Dipole Intensity (NAFDI: strength of the subtropical Saharan high -Morocco-to the monsoon tropical low -Nigeria-). The mobilization of dust from the different sources was associated with westward propagating Harmattan pulses linked to the change of phase of NAFDI (- to +), the associated westward shifts of the Saharan Heat Low and convective monsoon inflow. We found a correlation between dust composition in the SAL and NAFDI: moderate NAFDI values (0 to +2.5) were associated with Ca, K, Na, Mg and S rich dust linked to dust sources in NE Algeria, whereas higher NAFDI values (+2.5 to +4) were linked to Fe rich dust (Ca, Na and S depleted) linked to dust sources in SW Sahara – Western Sahel. The results of this study also show that some trace elements (Br, Cr, Ni, Zn and Zr) are influenced by industrial emissions into North Africa. © 2019 Elsevier Ltd
英文关键词	Dust geochemistry; Harmattan; NAFDI; North Africa; Saharan air layer; Saharan dust sources
语种	英语
scopus关键词	Atmospheric thermodynamics; Geochemistry; Hematite; Industrial emissions; Magnesium; Meteorology; Trace elements; Tropics; Harmattan; NAFDI; North Africa; Saharan air layers; Saharan dust; Dust; aluminum; arsenic; barium ion; calcium ion; chromium; cuprous ion; iron; lead; magnesium; manganese; nickel; potassium; rubidium ion; selenium; silicon; sodium; strontium; titanium; zinc ion; zirconium; atmospheric convection; atmospheric pollution; chemical composition; dust; geochemistry; industrial emission; isotopic ratio; meteorology; mobilization; observatory; pollutant source; subtropical region; trace element; Yermosol; aerosol; Article; dust; geochemistry; geographic and geological parameters; gravimetry; meteorology; North African; optical depth; particulate matter; priority journal; saharan air layer; Western Sahara; Algeria; Bechar; Canary Islands; Morocco; Nigeria; Sahel; Sahel [Sub-Saharan Africa]; Santa Cruz de Tenerife [(PRV) Canary Islands]; Spain; Tenerife; Western Sahara
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/129616
作者单位	Izaña Atmospheric Research Centre, AEMET, Tenerife, Spain; Estación Experimental de Zonas Aridas EEZA CSIC, Almería, Spain; Instituto de Productos Naturales y Agrobiología, IPNA CSIC, Tenerife, Spain; Istituto Nazionale di Fisica Nucleare, Firenze, Italy; Department of Chemistry, University of La Laguna, Spain; Universidad Europea de Canarias, Tenerife, Spain; Institute of Environmental Assessment and Water Research, IDAEA-CSIC, Barcelona, Spain; Physics and Astronomy Department, University of Florence, Italy
推荐引用方式 GB/T 7714	Rodríguez S.,Calzolai G.,Chiari M.,et al. Rapid changes of dust geochemistry in the Saharan Air Layer linked to sources and meteorology[J],2020,223.
APA	Rodríguez S..,Calzolai G..,Chiari M..,Nava S..,García M.I..,...&Querol X..(2020).Rapid changes of dust geochemistry in the Saharan Air Layer linked to sources and meteorology.Atmospheric Environment,223.
MLA	Rodríguez S.,et al."Rapid changes of dust geochemistry in the Saharan Air Layer linked to sources and meteorology".Atmospheric Environment 223(2020).