Kahnert Michael, Kanngießer Franz
Opt Express. 2021 Mar 29;29(7):10639-10658. doi: 10.1364/OE.422523.
Aerosol optics models are an integral part of of climate models and of retrieval methods for global remote sensing observations. Such large-scale environmental applications place tight constraints on the affordable model complexity, which are difficult to reconcile with the considerable level of detail that is needed to capture the sensitivity of optical properties to morphological aerosol characteristics. Here, we develop a novel core-grey-shell dimer model and demonstrate its potential for reproducing radiometric and polarimetric properties of black carbon aerosols. The depolarisation is mainly sensitive to the relative size of the monomers, while the optical cross sections depend on the core-shell partitioning of black carbon. The optimum choice of these parameters is fairly stable across particle sizes and soot volume fraction, as is demonstrated by comparison with a more realistic coated aggregate model.
气溶胶光学模型是气候模型以及全球遥感观测反演方法不可或缺的一部分。此类大规模环境应用对可承受的模型复杂度施加了严格限制，这很难与捕捉光学特性对形态学气溶胶特征的敏感性所需的相当程度的细节相协调。在此，我们开发了一种新颖的核 - 灰壳二聚体模型，并展示了其再现黑碳气溶胶辐射和偏振特性的潜力。退偏主要对单体的相对尺寸敏感，而光学截面则取决于黑碳的核壳分布。通过与更现实的包覆聚集体模型比较表明，这些参数的最佳选择在粒径和烟灰体积分数范围内相当稳定。
