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Effects of dust particle internal structure on light scattering

机译：尘埃颗粒内部结构对光散射的影响

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There is a large variety of internal structures inside atmospheric dust particles, making them inherently inhomogeneous. Such structures may have a large effect on ground-level and atmospheric radiation. So far, dust particle internal structures and their effect on the light scattering properties have proved to be hard to quantify, in part due to challenges in obtaining information about these structures. Recently, internal structures of individual dust particles were revealed through focused ion beam milling and analyzed. Here, we perform a sensitivity study to evaluate the optical impacts of some of the typical internal structures revealed. To obtain suitable model particles, the first step is to generate inhomogeneous particles with varying internal structures by using an algorithm that is based on three-dimensional Voronoi tessellation. The parameters for the particle generation are obtained from studies of real-world Asian dust particles. The second step is to generate homogeneous versions of the generated particles by using an effective-medium approximation, for comparison. Third, light scattering by both versions of these particles is simulated with discrete dipole approximation code. This allows us to see how different internal structures affect light scattering, and how important it is to account for these structures explicitly. Further, this allows us to estimate the potential inaccuracies caused by using only homogeneous model particles for atmospheric studies and remote-sensing measurements. The results show that the effects vary greatly between different kinds of internal structures and single-scattering quantity considered, but for most structure types the effects are overall notable. Most significantly, hematite inclusions in particles impact light scattering heavily. Furthermore, internal pores and hematite-rich coating both affect some form of light scattering noticeably. Based on this work, it seems that it is exceedingly important that the effects of dust particle internal structures on light scattering are accounted for in a wide variety of applications.
机译：大气粉尘颗粒内部有各种内部结构，使其固有地不均匀。这种结构可能对地面和大气辐射具有很大的影响。到目前为止，已经证明，除尘颗粒内部结构及其对光散射特性的影响是难以量化的，部分原因是获得了关于这些结构的信息的挑战。最近，通过聚焦离子束铣削并分析了各种粉尘颗粒的内部结构。这里，我们执行敏感性研究以评估一些典型的内部结构的光学冲击。为了获得合适的模型颗粒，第一步是通过使用基于三维Voronoi曲面细胞的算法产生具有不同内部结构的非均匀颗粒。颗粒生成参数是从真实世界亚洲粉尘颗粒的研究获得的。第二步是通过使用有效介质近似来产生产生的颗粒的同质版本，以进行比较。第三，用离散偶极近似码模拟这些粒子的两个版本的光散射。这使我们能够了解不同的内部结构如何影响光散射，并且明确地对这些结构进行解释的重要性。此外，这允许我们估计仅使用均匀模型颗粒用于大气研究和遥感测量引起的潜在不准确性。结果表明，效果在不同类型的内部结构和考虑的单散射量之间变化很大，但对于大多数结构类型而言，效果是总体显着的。最显着的是，颗粒中的赤铁矿夹杂物撞击光散射。此外，内部孔隙和含赤铁矿涂层均显着影响某种形式的光散射。基于这项工作，似乎非常重要的是，粉尘粒子内部结构对光散射的影响被占了各种应用。

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