DOI: 10.1016/j.atmosenv.2019.117186
论文题名: Rapid changes of dust geochemistry in the Saharan Air Layer linked to sources and meteorology
作者: 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.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 223 语种: 英语
英文关键词: 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
学科: Dust geochemistry
; Harmattan
; NAFDI
; North Africa
; Saharan air layer
; Saharan dust sources
中文摘要: 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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/161011
Appears in Collections: 气候变化与战略
There are no files associated with this item.
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
Recommended Citation:
Rodríguez S.,Calzolai G.,Chiari M.,et al. Rapid changes of dust geochemistry in the Saharan Air Layer linked to sources and meteorology[J]. Atmospheric Environment,2020-01-01,223