Advanced Bulk Optical Models Linking the Backscattering and Microphysical Properties of Mineral Dust Aerosol
Advanced Bulk Optical Models Linking the Backscattering and Microphysical Properties of Mineral Dust Aerosol
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联系矿尘气溶胶后向散射和微物理特性的先进体光学模式
DOI：
10.1029/2021gl095121
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发表时间：
2021-07
影响因子：
5.2
通讯作者：
M. Saito;P. Yang
中科院分区：
文献类型：
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作者：
M. Saito;P. Yang
基于TAMUdust2020（一个综合的不规则气溶胶颗粒单散射特性数据库），研究了矿物粉尘气溶胶的后向散射特性对微物理特性（特别是尺寸和形状）的敏感性。我们基于具有随机扭曲形状和光谱分辨的复折射率的尺寸分辨颗粒集合开发了大块矿物粉尘颗粒模型，这些模型受到文献中报道的原位观测的限制。光探测和测距（激光雷达）比对粒子形状比对粒子大小更敏感，而退极化比对粒子大小有很大的依赖性。有效半径为0.5 ~ 3µm的典型矿物粉尘颗粒的体后向散射特性（即激光雷达比和退极化比）的模拟结果与几次野外实验的激光雷达观测结果基本一致。现有的粉尘体光学特性模型适用于基于激光雷达的粉尘气溶胶特性遥感。
Sensitivities of the backscattering properties to the microphysical properties (in particular, size and shape) of mineral dust aerosols are examined based on TAMUdust2020, a comprehensive single‐scattering property database of irregular aerosol particles. We develop the bulk mineral dust particle models based on size‐resolved particle ensembles with randomly distorted shapes and spectrally resolved complex refractive indices, which are constrained by using in situ observations reported in the literature. The light detection and ranging (lidar) ratio is more sensitive to particle shape than particle size, while the depolarization ratio depends strongly on particle size. The simulated bulk backscattering properties (i.e., the lidar ratio and the depolarization ratio) of typical mineral dust particles with effective radii of 0.5–3 µm are reasonably consistent with lidar observations made during several field campaigns. The present dust bulk optical property models are applicable to lidar‐based remote sensing of dust aerosol properties.