Ability of multiangle remote sensing observations to identify and distinguish mineral dust types: Optical models and retrievals of optically thick plumes

摘要: [1] We present a systematic theoretical study of atmospheric mineral dust radiative properties, focusing on implications for multiangle and multispectral remote sensing. We model optical properties complex, nonspherical mixtures in three visible-near-infrared satellite channels: 0.550, 0.672, 0.866 μm, accounting recent field laboratory data morphology mineralogy. To the dust, we employ discrete dipole approximation technique particles up to 2 μm diameter T matrix method 12 μm. investigate impact particle irregularity, composition, size distribution develop models representative natural composition-size-shape types. Sensitivity studies with these indicate that Multiangle Imaging Spectroradiometer (MISR) should be able distinguish plate-like from grain-like particles, weakly strongly absorbing compositional types, monomodal bimodal distributions. Models containing grain-like, absorbing, distributions were favored optically thick Saharan Asian plume examples, whereas rejected. will detailed, MISR sensitivity analysis more complex cases using derived here future paper.