DOI: 10.1016/j.atmosres.2018.01.013
Scopus记录号: 2-s2.0-85044344243
论文题名: The role of natural mineral particles collected at one site in Patagonia as immersion freezing ice nuclei
作者: López M.L. ; Borgnino L. ; Ávila E.E.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 204 起始页码: 94
结束页码: 101
语种: 英语
英文关键词: Feldspars
; Ice nuclei particles
; Immersion freezing
; Patagonia
; Soil particles
Scopus关键词: Aromatic compounds
; Chemical analysis
; Drops
; Dust
; Feldspar
; Freezing
; Grain size and shape
; Ice
; Light scattering
; X ray diffraction
; Grain size distribution
; Ice nuclei
; Immersion freezing
; Methylene blue adsorption
; Mineralogical compositions
; Patagonia
; Soil particles
; Suspension concentrations
; Suspensions (fluids)
; concentration (composition)
; dust
; feldspar
; freezing
; ice crystal
; montmorillonite
; particulate matter
; Patagonia
英文摘要: This work studies the role of mineral particles collected in the region of Patagonia (Neuquén, Argentina) as ice nuclei particles (INPs) by immersion freezing mode. The particle immersion-freezing ability was analyzed under laboratory conditions by using an established drop-freezing technique. Mineralogical composition was characterized by using X-ray diffraction and electron micro probe analysis. Dynamic light scattering was used to determine the grain size distribution of particles, while the N2 adsorption and methylene blue adsorption methods were applied to determine their specific surface area. Water droplets of different volumes containing different concentrations of particles were cooled until droplets were frozen. For all the analyzed drop volumes, an increase in the freezing temperature of the drops was observed with increasing dust concentration. In the same way, the freezing temperature increased when the drop volume was increased at constant dust concentration. Both behaviors were linked to the availability of active sites in the particles. A plateau in the freezing temperature was observed at high suspension concentration for all the drop volumes. This plateau was related to the aggregation of the particles when the suspension concentration was increased and to the consequent decrease in the number of active sites. The active sites per unit of surface area were calculated and reported. For the studied range of temperature, results are in agreement with those reported for different sites and particles. From the chemical and morphological analysis of the particle components and the results obtained from the literature, it was concluded that even though montmorillonite was the main mineral in the collected sample, the accessory minerals deserve to be analyzed in detail in order to know if they could be responsible for the ability of the collected soil particles to act as INPs. Considering that the region of Patagonia has been identified as an important source of natural mineral particles in the atmosphere, it is important to analyze the ability of these particles to act as INP. As far as we know, this is the first study carrying out this investigation. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108930
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: IFEG-CONCIET-FaMAF, Universidad Nacional de Córdoba, Córdoba, Argentina; CICTERRA-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina
Recommended Citation:
López M.L.,Borgnino L.,Ávila E.E.. The role of natural mineral particles collected at one site in Patagonia as immersion freezing ice nuclei[J]. Atmospheric Research,2018-01-01,204