The multi-angle polarimetric satellite observations are helpful for improving the retrievals of aerosol parameters. However, practical applications of polarization technology are still limited because of complexity of measurement and interpretation of polarimetric observations. In this study, we analyze the performance of a new component approach developed in the frame of the Generalized Retrieval of Atmosphere and Surface Properties (GRASP) algorithm. In addition to aerosol optical properties including particle size distribution, non-sphericity and index of refraction that are commonly derived from multi-angle radiance and polarization measurements, the GRASP/Component approach also provides some information about aerosol composition. Specifically, in this approach aerosol is modeled as an internal mixture of several components with distinctly different chemical compositions and known refractive indices. The approach is intended not only to provide additional insight on aerosol composition but also to improve retrieval of basic aerosol optical properties. This study presents comprehensive validation and evaluation of Aerosol Optical Depth (AOD), Ångström exponent (AE), fine mode AOD (AODF), coarse mode AOD (AODC), and single scattering albedo (SSA) as retrieved by the GRASP/Component approach. The GRASP/Component products include aerosol retrievals using two different aerosol component mixing rules, i.e., Maxwell-Garnett (MG) effective medium approximation and a simple Volume-Weighted averaging (VW). The differences between the results obtained using these two assumptions are also discussed. The obtained results show that the aerosol optical property products of GRASP/Component approach have good agreement with the ground-based AERONET measurements, which is comparable to other PARASOL/GRASP approaches. Specifically, the AOD retrieved by GRASP/Component approach show high correlation and nearly no bias both over land and ocean, as compared with AERONET. The more detailed aerosol properties such as AE, AODF, AODC and SSA also show one of the best comparisons with AERONET. These improvements can probably be attributed to the use of the additional physical constraints on spectral dependence of the complex refractive index and the reduction of total number of aerosol parameters directly retrieved in the GRASP/Component approach. In addition, the choice of mixing rules had no significant effect on optical retrievals. With the exception of SSA, the results obtained based on the MG mixing rule were found to be slightly better over those obtained using VW mixing rule, especially for bias.

多角度极化卫星观测有助于改进气溶胶参数的反演。然而，由于偏振观测测量和解释的复杂性，偏振技术的实际应用仍然受到限制。在这项研究中，我们分析了在大气和表面特性的广义检索 (GRASP) 算法框架内开发的新组件方法的性能。除了通常从多角度辐射和偏振测量得出的气溶胶光学特性（包括粒度分布、非球形度和折射率）外，GRASP/Component 方法还提供了一些有关气溶胶成分的信息。具体来说，在这种方法中，气溶胶被建模为几种成分的内部混合物，这些成分具有明显不同的化学成分和已知的折射率。该方法不仅旨在提供有关气溶胶成分的额外见解，而且还旨在改善对基本气溶胶光学特性的检索。本研究提供了对气溶胶光学深度 (AOD)、Ångström 指数 (AE)、精细模式 AOD (AODF)、粗模式 AOD (AODC) 和单散射反照率 (SSA) 的综合验证和评估，如通过 GRASP/分量方法检索. GRASP/Component 产品包括使用两种不同气溶胶成分混合规则的气溶胶反演，即 Maxwell-Garnett (MG) 有效介质近似和简单的体积加权平均 (VW)。还讨论了使用这两个假设获得的结果之间的差异。所得结果表明，GRASP/Component 方法的气溶胶光学性质产物与地基 AERONET 测量结果具有良好的一致性，与其他 PARASOL/GRASP 方法相当。具体而言，与 AERONET 相比，通过 GRASP/Component 方法检索的 AOD 显示出高度相关性，并且在陆地和海洋上几乎没有偏差。AE、AODF、AODC 和 SSA 等更详细的气溶胶属性也显示出与 AERONET 的最佳比较之一。这些改进可能归因于对复折射率光谱依赖性的附加物理约束的使用以及在 GRASP/组件方法中直接检索的气溶胶参数总数的减少。此外，混合规则的选择对光学检索没有显着影响。