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Título: | Rapid changes of dust geochemistry in the Saharan Air Layer linked to sources and meteorology |
Autor: | Rodríguez, Sergio CSIC ORCID CVN ; Calzolai, Giulia; Chiari, Massimo; Nava, Silvia; Isabel García, M.; López-Solano, Javier; Marrero, Carlos; López-Darias, Jessica CSIC ORCID; Cuevas, Emilio CSIC ORCID; Alonso-Pérez, Silvia CSIC ORCID; Prats, Natalia; Amato, Fulvio CSIC ORCID ; Lucarelli, Franco; Querol, Xavier CSIC ORCID | Fecha de publicación: | 2019 | Editor: | Elsevier BV | Citación: | Atmospheric Environment 223: 117186 (2020) | Resumen: | 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/m), 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. | Versión del editor: | http://dx.doi.org/10.1016/j.atmosenv.2019.117186 | URI: | http://hdl.handle.net/10261/203609 | DOI: | 10.1016/j.atmosenv.2019.117186 | Identificadores: | doi: 10.1016/j.atmosenv.2019.117186 issn: 1873-2844 |
Aparece en las colecciones: | (EEZA) Artículos (IDAEA) Artículos (IPNA) Artículos |
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2020-SRODRIGUEZ-rapid-variability-dust-composition.pdf | 13,49 MB | Adobe PDF | Visualizar/Abrir |
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