气候变化领域集成服务门户(CCPortal): Intrusions of dust and iberulites in Granada basin (Southern Iberian Peninsula). Genesis and formation of atmospheric iberulites

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DOI	10.1016/j.atmosres.2020.105260
	Intrusions of dust and iberulites in Granada basin (Southern Iberian Peninsula). Genesis and formation of atmospheric iberulites
	Párraga J.; Martín-García J.M.; Delgado G.; Molinero-García A.; Cervera-Mata A.; Guerra I.; Fernández-González M.V.; Martín-Rodríguez F.J.; Lyamani H.; Casquero-Vera J.A.; Valenzuela A.; Olmo F.J.; Delgado R.
发表日期	2021
ISSN	0169-8095
卷号	248
英文摘要	Fourteen samples of deposited atmospheric dust collected during desert dust intrusions over Granada in the summer of 2010 are studied here. During these atmospheric dust events the PM10 ranged from 25 μg m−3 to 200 μg m−3, surpassing occasionally the standard limit (50 μg m−3) established by the European Union Directive as a risk for the human health. The mineralogical composition of the dust samples is very heterogeneous, showing that the origin of collected particles is from north-northwest of Africa and local/regional soils. The analyzed dust samples contain between 1 and 9% of iberulites, polymineral spherical particles with diameter between 34 and 111 μm. New compositional results obtained by mapping chemical elements and mineral compositions of iberulites with VPSEM-EDEX technology allowed as to go further than previous studies and provide new insight on the iberulites genesis. The SEM-microstructure analysis of the iberulites and the compositional results obtained by VPSEM-EDEX technique showed that clay and sulphur components are important in determining their spherical shapes. The analysis also shows that iberulites present a typical vortex at one of the poles and an external covering by nano-clays in laminar clusters, a form of rind and a core internal with sizes less than 10 μm. On the other hand, the micromorphological analysis evidences that the bacteria and its polymeric exudates participate in the iberulite genesis, acting as aggregation agents and contributing to its protection and compensating its fragility. The role of bacteria and its polymeric exudates in the iberulite genesis has not been described previously, and it would explain the flux, transport and survival of tropospheric microorganisms over long distances. These new observations and finding led us to take into account the role of bacteria in iberulite genesis and to reconsider the previous hypothesis regarding the iberulite genesis proposed in previous works. © 2020
英文关键词	Bacterial EPS; Human Health; Iberulites genesis; Rare Earth elements; Saharan dust
语种	英语
scopus关键词	Atmospheric chemistry; Bacteria; Chemical analysis; Chemical elements; Health risks; Minerals; Particle size analysis; Polymers; Atmospheric dust; European Union Directive; Iberian Peninsula; Microstructure analysis; Mineral composition; Mineralogical compositions; Spherical particle; Spherical shape; Dust; bacterium; dust; exopolymer; mineralogy; public health; rare earth element; Andalucia; Granada Basin; Granada [Andalucia]; Iberian Peninsula; Spain; Bacteria (microorganisms)
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141679
作者单位	Department of Soil Science and Agriculture Chemistry, Faculty of Pharmacy, University of Granada, Spain; Unidad de Microscopía Electrónica de Barrido de alta resolución y Microanálisis, Centro de Instrumentación Científica, Spain; Andalusian Institute for Earth System Research, IISTA-CEAMA, University of Granada, Junta de Andalucía, Granada, 18006, Spain; Department of Applied Physics, University of Granada, Granada, 18071, Spain
推荐引用方式 GB/T 7714	Párraga J.,Martín-García J.M.,Delgado G.,et al. Intrusions of dust and iberulites in Granada basin (Southern Iberian Peninsula). Genesis and formation of atmospheric iberulites[J],2021,248.
APA	Párraga J..,Martín-García J.M..,Delgado G..,Molinero-García A..,Cervera-Mata A..,...&Delgado R..(2021).Intrusions of dust and iberulites in Granada basin (Southern Iberian Peninsula). Genesis and formation of atmospheric iberulites.Atmospheric Research,248.
MLA	Párraga J.,et al."Intrusions of dust and iberulites in Granada basin (Southern Iberian Peninsula). Genesis and formation of atmospheric iberulites".Atmospheric Research 248(2021).