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Magnetic signatures of natural and anthropogenic sources of urban dust aerosol

机译：城市粉尘气溶胶天然和人为来源的磁信号

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The characteristics of urban dust aerosols and the contributions of their natural and anthropogenic sources are of scientific interest as well as being of substantial sociopolitical and economic concern. Here we present a comprehensive study of dust flux, magnetic parameters, magnetic particulate morphology, and elemental compositions of atmospheric dustfall originating from natural dust sources in East Asia and local anthropogenic sources in Xi'an, China. The results reveal a significant inverse relationship between seasonal variations of dust flux and magnetic susceptibility ( χ ). By comparing dust flux and χ records, the relative contributions of dust from local anthropogenic sources are estimated. Analyses using scanning electron microscopy (SEM) combined with energy dispersive spectroscopy (EDS) indicate that magnetic particulate from different sources has distinct morphological and elemental characteristics. Detrital magnetic particles originating from natural sources are characterized by relatively smooth surfaces with Fe and O as the major elements and a minor contribution from Ti. The anthropogenic particles have angular, spherical, aggregate, and porous shapes with distinctive contributions from marker elements, including S, Cr, Cu, Zn, Ni, Mn, and Ca. Our results demonstrate that this multidisciplinary approach is effective in distinguishing dust particles derived from distant natural sources and local anthropogenic sources and for the quantitative assessment of contributions from the two end-members.
机译：城市粉尘气溶胶的特性及其自然和人为来源的贡献具有科学意义，并引起社会政治和经济上的极大关注。在这里，我们对来自东亚的天然粉尘源和中国西安的局部人为源的大气尘埃的磁通量，磁参数，磁性颗粒形态和元素组成进行了全面研究。结果表明，粉尘通量的季节变化与磁化率（χ）之间存在显着的反比关系。通过比较粉尘通量和χ记录，可以估算当地人为来源的粉尘相对贡献。使用扫描电子显微镜（SEM）结合能量色散光谱（EDS）进行的分析表明，来自不同来源的磁性颗粒具有独特的形态和元素特征。源于自然资源的碎屑磁性颗粒的特征是相对光滑的表面，以Fe和O为主要元素，而Ti的贡献很小。人为颗粒具有角，球形，聚集体和多孔形状，其中包括S，Cr，Cu，Zn，Ni，Mn和Ca在内的标记元素具有独特的作用。我们的结果表明，这种多学科方法可有效地区分来自遥远自然源和当地人为源的尘埃颗粒，并能定量评估两个最终成员的贡献。

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